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Rice

October 15, 2023

For other uses, see Rice (disambiguation).

Rice is the seed of the grass species Oryza sativa (Asian rice) or, less commonly, O. glaberrima (African rice). The name wild rice is usually used for species of the genera Zizania and Porteresia, both wild and domesticated, although the term may also be used for primitive or uncultivated varieties of Oryza.

A mixture of brown, white, and red indica rice, also containing wild rice, Zizania species

As a cereal grain, domesticated rice is the most widely consumed staple food for over half of the world's human population,[1] particularly in Asia and Africa. It is the agricultural commodity with the third-highest worldwide production, after sugarcane and maize.[2] Since sizable portions of sugarcane and maize crops are used for purposes other than human consumption, rice is the most important food crop with regard to human nutrition and caloric intake, providing more than one-fifth of the calories consumed worldwide by humans.[3] There are many varieties of rice, and culinary preferences tend to vary regionally.

The traditional method for cultivating rice is flooding the fields while, or after, setting the young seedlings. This simple method requires sound irrigation planning, but it reduces the growth of less robust weed and pest plants that have no submerged growth state, and deters vermin. While flooding is not mandatory for the cultivation of rice, all other methods of irrigation require higher effort in weed and pest control during growth periods and a different approach for fertilizing the soil.

Rice, a monocot, is normally grown as an annual plant, although in tropical areas it can survive as a perennial and can produce a ratoon crop for up to 30 years.[4] Rice cultivation is well-suited to countries and regions with low labor costs and high rainfall, as it is labor-intensive to cultivate and requires ample water. However, rice can be grown practically anywhere, even on a steep hill or mountain area with the use of water-controlling terrace systems. Although its parent species are native to Asia and certain parts of Africa, centuries of trade and exportation have made it commonplace in many cultures worldwide. Production and consumption of rice is estimated to have been responsible for 4% of global greenhouse gas emissions in 2010.

Characteristics

The rice plant can grow to 1–1.8 m (3–6 ft) tall, occasionally more depending on the variety and soil fertility. It has long, slender leaves 50–100 cm (20–40 in) long and 2–2.5 cm (3⁄4–1 in) broad. The small wind-pollinated flowers are produced in a branched arching to pendulous inflorescence 30–50 cm (12–20 in) long. The edible seed is a grain (caryopsis) 5–12 mm (3⁄16–15⁄32 in) long and 2–3 mm (3⁄32–1⁄8 in) thick.

Rice is a cereal crop belonging to the family Poecae. Rice being a tropical crop can be grown during the two distinct seasons (dry and wet) of the year provided that moisture is made available to the crop.[5]

Food

Main article: Rice as food

Rice is commonly consumed as food around the world. The varieties of rice are typically classified as long-, medium-, and short-grained.[6] The grains of long-grain rice (high in amylose) tend to remain intact after cooking; medium-grain rice (high in amylopectin) becomes more sticky. Medium-grain rice is used for sweet dishes, for risotto in Italy, and many rice dishes, such as arròs negre, in Spain. Some varieties of long-grain rice that are high in amylopectin, known as Thai Sticky rice, are usually steamed.[7] A stickier short-grain rice is used for sushi;[8] the stickiness allows rice to hold its shape when cooked.[9] Short-grain rice is used extensively in Japan,[10] including to accompany savoury dishes.[11]

Rice-growing environments

Rice growth and production are affected by: the environment, soil properties, biotic conditions, and cultural practices. Environmental factors include rainfall and water, temperature, photoperiod, solar radiation and, in some instances, tropical storms. Soil factors refer to soil type and their position in uplands or lowlands. Biotic factors deal with weeds, insects, diseases, and crop varieties.[12]

Rice can be grown in different environments, depending upon water availability.[13] Generally, rice does not thrive in a waterlogged area, yet it can survive and grow herein[14] and it can survive flooding.[15]

  1. Lowland, rainfed, which is drought prone, favors medium depth; waterlogged, submergence, and flood prone
  2. Lowland, irrigated, grown in both the wet season and the dry season
  3. Deep water or floating rice
  4. Coastal wetland
  5. Upland rice (also known as hill rice or Ghaiya rice)

History of cultivation

This section is an excerpt from History of rice cultivation.[edit]

The current scientific consensus, based on archaeological and linguistic evidence, is that Oryza sativa rice was first domesticated in the Yangtze River basin in China 13,500 to 8,200 years ago.[16][17][18][19] Cultivation, migration and trade spread rice around the world—first to much of east Asia, and then further abroad, and eventually to the Americas as part of the Columbian exchange. The now less common Oryza glaberrima rice was independently domesticated in Africa around 3,000 years ago.[20]

Since its spread, rice has become a global staple crop important to food security and food cultures around the world. Local varieties of Oryza sativa have resulted in over 40,000 cultivars of various types. More recent changes in agricultural practices and breeding methods as part of the Green Revolution and other transfers of agricultural technologies has led to increased production in recent decades.[21]

Production and commerce

Rice production – 2020
Country Millions of tonnes
  China 211.9
  India 178.3
  Bangladesh 54.9
  Indonesia 54.6
  Vietnam 42.8
  Thailand 30.2
  Myanmar 25.1
  Philippines 19.3
  Brazil 11.1
  Cambodia 11.0
World 756.7
Source: FAOSTAT of the United Nations[22]

Production

See also: List of countries by rice production
 
Worldwide rice production
 
Production of rice (2019)[23]

In 2020, world production of paddy rice was 756.7 million metric tons (834.1 million short tons),[24] led by China and India with a combined 52% of this total.[2] Other major producers were Bangladesh, Indonesia and Vietnam. The five major producers accounted for 72% of total production, while the top fifteen producers accounted for 91% of total world production in 2017. Developing countries account for 95% of the total production.[25]

Rice is a major food staple and a mainstay for the rural population and their food security. It is mainly cultivated by small farmers in holdings of less than one hectare. Rice is also a wage commodity for workers in the cash crop or non-agricultural sectors. Rice is vital for the nutrition of much of the population in Asia, as well as in Latin America and the Caribbean and in Africa; it is central to the food security of over half the world population.

Many rice grain producing countries have significant losses post-harvest at the farm and because of poor roads, inadequate storage technologies, inefficient supply chains and farmer's inability to bring the produce into retail markets dominated by small shopkeepers. A World Bank – FAO study claims 8% to 26% of rice is lost in developing nations, on average, every year, because of post-harvest problems and poor infrastructure. Some sources claim the post-harvest losses exceed 40%.[25][26] Not only do these losses reduce food security in the world, the study claims that farmers in developing countries such as China, India and others lose approximately US$89 billion of income in preventable post-harvest farm losses, poor transport, the lack of proper storage and retail. One study claims that if these post-harvest grain losses could be eliminated with better infrastructure and retail network, in India alone enough food would be saved every year to feed 70 to 100 million people.[27]

Processing

The seeds of the rice plant are first milled using a rice huller to remove the chaff (the outer husks of the grain) (see: rice hulls). At this point in the process, the product is called brown rice. The milling may be continued, removing the bran, i.e., the rest of the husk and the germ, thereby creating white rice. White rice, which keeps longer, lacks some important nutrients; moreover, in a limited diet which does not supplement the rice, brown rice helps to prevent the disease beriberi.

Either by hand or in a rice polisher, white rice may be buffed with glucose or talc powder (often called polished rice, though this term may also refer to white rice in general), parboiled, or processed into flour. White rice may also be enriched by adding nutrients, especially those lost during the milling process. While the cheapest method of enriching involves adding a powdered blend of nutrients that will easily wash off (in the United States, rice which has been so treated requires a label warning against rinsing), more sophisticated methods apply nutrients directly to the grain, coating the grain with a water-insoluble substance which is resistant to washing.

In some countries, a popular form, parboiled rice (also known as converted rice and easy-cook rice[28]) is subjected to a steaming or parboiling process while still a brown rice grain. The parboil process causes a gelatinisation of the starch in the grains. The grains become less brittle, and the color of the milled grain changes from white to yellow. The rice is then dried, and can then be milled as usual or used as brown rice. Milled parboiled rice is nutritionally superior to standard milled rice, because the process causes nutrients from the outer husk (especially thiamine) to move into the endosperm, so that less is subsequently lost when the husk is polished off during milling. Parboiled rice has an additional benefit in that it does not stick to the pan during cooking, as happens when cooking regular white rice. This type of rice is eaten in parts of India and countries of West Africa are also accustomed to consuming parboiled rice.

Rice bran, called nuka in Japan, is a valuable commodity in Asia and is used for many daily needs. It is a moist, oily inner layer which is heated to produce oil. It is also used as a pickling bed in making rice bran pickles and takuan.

Raw rice may be ground into flour for many uses, including making many kinds of beverages, such as amazake, horchata, rice milk, and rice wine. Rice does not contain gluten, so is suitable for people on a gluten-free diet.[29] Rice can be made into various types of noodles. Raw, wild, or brown rice may also be consumed by raw-foodist or fruitarians if soaked and sprouted (usually a week to 30 days – gaba rice).

Processed rice seeds must be boiled or steamed before eating. Boiled rice may be further fried in cooking oil or butter (known as fried rice), or beaten in a tub to make mochi.

Rice is a good source of protein and a staple food in many parts of the world, but it is not a complete protein: it does not contain all of the essential amino acids in sufficient amounts for good health, and should be combined with other sources of protein, such as nuts, seeds, beans, fish, or meat.[30]

Rice, like other cereal grains, can be puffed (or popped). This process takes advantage of the grains' water content and typically involves heating grains in a special chamber. Further puffing is sometimes accomplished by processing puffed pellets in a low-pressure chamber. The ideal gas law means either lowering the local pressure or raising the water temperature results in an increase in volume prior to water evaporation, resulting in a puffy texture. Bulk raw rice density is about 0.9 g/cm3. It decreases to less than one-tenth that when puffed.

Harvesting, drying and milling

Further information: Paddy field

Unmilled rice, known as "paddy" (Indonesia and Malaysia: padi; Philippines, palay), is usually harvested when the grains have a moisture content of around 25%. In most Asian countries, where rice is almost entirely the product of smallholder agriculture, harvesting is carried out manually, although there is a growing interest in mechanical harvesting. Harvesting can be carried out by the farmers themselves, but is also frequently done by seasonal labor groups. Harvesting is followed by threshing, either immediately or within a day or two. Again, much threshing is still carried out by hand but there is an increasing use of mechanical threshers. Subsequently, paddy needs to be dried to bring down the moisture content to no more than 20% for milling.

A familiar sight in several Asian countries is paddy laid out to dry along roads. However, in most countries the bulk of drying of marketed paddy takes place in mills, with village-level drying being used for paddy to be consumed by farm families. Mills either sun dry or use mechanical driers or both. Drying has to be carried out quickly to avoid the formation of molds. Mills range from simple hullers, with a throughput of a couple of tonnes a day, that simply remove the outer husk, to enormous operations that can process 4 thousand metric tons (4.4 thousand short tons) a day and produce highly polished rice. A good mill can achieve a paddy-to-rice conversion rate of up to 72% but smaller, inefficient mills often struggle to achieve 60%. These smaller mills often do not buy paddy and sell rice but only service farmers who want to mill their paddy for their own consumption.

  •  

    Rice combine harvester in Katori, Chiba Prefecture, Japan ]]

  •  

    After the harvest, rice straw is gathered in the traditional way from small paddy fields in Mae Wang District, Thailand

  •  

    Burning of rice residues after harvest, to quickly prepare the land for wheat planting, around Sangrur, India

  •  

    Drying rice in Peravoor, India

Distribution

Because of the importance of rice to human nutrition and food security in Asia, the domestic rice markets tend to be subject to considerable state involvement. While the private sector plays a leading role in most countries, agencies such as BULOG in Indonesia, the NFA in the Philippines, VINAFOOD in Vietnam and the Food Corporation of India are all heavily involved in purchasing of paddy from farmers or rice from mills and in distributing rice to poorer people. BULOG and NFA monopolise rice imports into their countries while VINAFOOD controls all exports from Vietnam.[31]

Trade

World trade figures are much smaller than those for production, as less than 8% of rice produced is traded internationally.[32] In economic terms, the global rice trade was a small fraction of 1% of world mercantile trade. Many countries consider rice as a strategic food staple, and various governments subject its trade to a wide range of controls and interventions.

Developing countries are the main players in the world rice trade, accounting for 83% of exports and 85% of imports. While there are numerous importers of rice, the exporters of rice are limited. Just five countries—Thailand, Vietnam, China, the United States and India—in decreasing order of exported quantities, accounted for about three-quarters of world rice exports in 2002.[25] However, this ranking has been rapidly changing in recent years. In 2010, the three largest exporters of rice, in decreasing order of quantity exported were Thailand, Vietnam and India. By 2012, India became the largest exporter of rice with a 100% increase in its exports on year-to-year basis, and Thailand slipped to third position.[33][34] Together, Thailand, Vietnam and India accounted for nearly 70% of the world rice exports.

The primary variety exported by Thailand and Vietnam were Jasmine rice, while exports from India included aromatic Basmati variety. China, an exporter of rice in the early 2000s, had become a net importer of rice by 2010.[32][35] According to a USDA report, the world's largest exporters of rice in 2012 were India (9.75 million metric tons (10.75 million short tons)), Vietnam (7 million metric tons (7.7 million short tons)), Thailand (6.5 million metric tons (7.2 million short tons)), Pakistan (3.75 million metric tons (4.13 million short tons)) and the United States (3.5 million metric tons (3.9 million short tons)).[36]

Major importers usually include Nigeria, Indonesia, Bangladesh, Saudi Arabia, Iran, Iraq, Malaysia, the Philippines, Brazil and some African and Persian Gulf countries. In common with other West African countries, Nigeria is actively promoting domestic production. However, its very heavy import duties (110%) open it to smuggling from neighboring countries.[37] Parboiled rice is particularly popular in Nigeria. Although China and India are the two largest producers of rice in the world, both countries consume the majority of the rice produced domestically, leaving little to be traded internationally.

Yield records

The average world yield for rice was 4.3 metric tons per hectare (1.9 short tons per acre), in 2010. Australian rice farms were the most productive in 2010, with a nationwide average of 10.8 metric tons per hectare (4.8 short tons per acre).[38]

Yuan Longping of China National Hybrid Rice Research and Development Center set a world record for rice yield in 2010 at 19 metric tons per hectare (8.5 short tons per acre) on a demonstration plot. In 2011, this record was reportedly surpassed by an Indian farmer, Sumant Kumar, with 22.4 metric tons per hectare (10.0 short tons per acre) in Bihar, although this claim has been disputed by both Yuan and India's Central Rice Research Institute. These efforts employed newly developed rice breeds and System of Rice Intensification (SRI), a recent innovation in rice farming.[39][40][41][42]

Worldwide consumption

Food consumption of rice in 2013
(millions of metric tons of paddy equivalent)[43]
  China 162.4
  India 130.4
  Indonesia 50.4
  Bangladesh 40.3
  Vietnam 19.9
  Philippines 17.6
  Thailand 11.5
  Japan 11.4

As of 2013, world food consumption of rice was 565.6 million metric tons (623.5 million short tons) of paddy equivalent (377,283 metric tons (415,883 short tons) of milled equivalent), while the largest consumers were China consuming 162.4 million metric tons (179.0 million short tons) of paddy equivalent (28.7% of world consumption) and India consuming 130.4 million metric tons (143.7 million short tons) of paddy equivalent (23.1% of world consumption).[43]

Between 1961 and 2002, per capita consumption of rice increased by 40% worldwide.[44] Rice is the most important crop in Asia. In Cambodia, for example, 90% of the total agricultural area is used for rice production.[45] Per capita, Bangladesh ranks as the country with the highest rice consumption, followed by Laos, Cambodia, Vietnam and Indonesia.[46]

U.S. rice consumption has risen sharply over the past 25 years, fueled in part by commercial applications such as beer production.[47] Almost one in five adult Americans now report eating at least half a serving of white or brown rice per day.[48]

Environmental impacts

 
Work by the International Center for Tropical Agriculture to measure the greenhouse gas emissions of rice production.

Climate change

The worldwide production of rice accounts for more greenhouse gas emissions (GHG) in total than that of any other plant food.[49] It was estimated in 2021 to be responsible for 30% of agricultural methane emissions and 11% of agricultural nitrous oxide emissions.[50] Methane release is caused by long-term flooding of rice fields, inhibiting the soil from absorbing atmospheric oxygen, a process causing anaerobic fermentation of organic matter in the soil.[51] A 2021 study estimated that rice contributed 2 billion tonnes of anthropogenic greenhouse gases in 2010,[49] of the 47 billion total.[52] The study added up GHG emissions from the entire lifecycle, including production, transportation, and consumption, and compared the global totals of different foods.[53] The total for rice was half the total for beef.[49]

A 2010 study found that, as a result of rising temperatures and decreasing solar radiation during the later years of the 20th century, the rice yield growth rate has decreased in many parts of Asia, compared to what would have been observed had the temperature and solar radiation trends not occurred.[54][55] The yield growth rate had fallen 10–20% at some locations. The study was based on records from 227 farms in Thailand, Vietnam, Nepal, India, China, Bangladesh, and Pakistan. The mechanism of this falling yield was not clear, but might involve increased respiration during warm nights, which expends energy without being able to photosynthesize. More detailed analysis of rice yields by the International Rice Research Institute forecast 20% reduction in yields in Asia per degree Celsius of temperature rise. Rice becomes sterile if exposed to temperatures above 35 °C (95 °F) for more than one hour during flowering and consequently produces no grain.[56][57]

Water usage

Rice requires slightly more water to produce than other grains.[58] Rice production uses almost a third of Earth's fresh water.[59] Water outflows from rice fields through transpiration, evaporation, seepage, and percolation.[60] It is estimated that it takes about 2,500 litres (660 US gal) of water need to be supplied to account for all of these outflows and produce 1 kilogram (2 lb 3 oz) of rice.[60]

Pests and diseases

Rice pests are animals which have the potential to reduce the yield or value of the rice crop (or of rice seeds); plants are described as weeds, while microbes are described as pathogens, disease-causing organisms.[61] Rice pests include insects, nematodes, rodents, and birds. A variety of factors can contribute to pest outbreaks, including climatic factors, improper irrigation, the overuse of insecticides and high rates of nitrogen fertilizer application.[62] Weather conditions also contribute to pest outbreaks. For example, rice gall midge and army worm outbreaks tend to follow periods of high rainfall early in the wet season, while thrips outbreaks are associated with drought.[63]

Pests

 
Chinese rice grasshopper
(Oxya chinensis)
Borneo, Malaysia

Major rice insect pests include: the brown planthopper (BPH),[64] several species of stemborers—including those in the genera Scirpophaga and Chilo,[65] the rice gall midge,[66] several species of rice bugs,[67] notably in the genus Leptocorisa,[68] defoliators such as the rice: leafroller, hispa and grasshoppers.[69] The fall army worm, a species of Lepidoptera, also targets and causes damage to rice crops.[70] Rice weevils attack stored produce.

Several nematode species infect rice crops, causing diseases such as ufra (Ditylenchus dipsaci), white tip disease (Aphelenchoide bessei), and root knot disease (Meloidogyne graminicola). Some nematode species such as Pratylenchus spp. are most damaging to upland rice of all parts of the world. Rice root nematode (Hirschmanniella oryzae) is a migratory endoparasite which on higher inoculum levels leads to complete destruction of a rice crop. Beyond being obligate parasites, they decrease the vigor of plants and increase the plants' susceptibility to other pests and diseases.[71][72]

Other pests include the apple snail (Pomacea canaliculata), panicle rice mite, rats,[73] and the weed Echinochloa crus-galli.[74]

Diseases

Main article: List of rice diseases

Rice blast, caused by the fungus Magnaporthe grisea (syn. M. oryzae, Pyricularia oryzae),[75] is the most significant disease affecting rice cultivation. It and bacterial leaf streak (caused by Xanthomonas oryzae pv. oryzae) are perennially the two worst rice diseases worldwide, and such is their importance – and the importance of rice – that they are both among the worst 10 diseases of all plants.[76] A 2010 review reported clones for quantitative disease resistance in plants.[77] The plant responds to the blast pathogen by releasing jasmonic acid, which then cascades into the activation of further downstream metabolic pathways which produce the defense response.[78] This accumulates as methyl-jasmonic acid.[78] The pathogen responds by synthesizing an oxidizing enzyme which prevents this accumlation and its resulting alarm signal.[78] OsPii-2 was discovered by Fujisaki et al., 2017.[79] It is a nucleotide-binding leucine-rich repeat receptor (NB-LRR, NLR), an immunoreceptor.[79] It includes an NOI domain (NO3-induced) which binds rice's own Exo70-F3 protein.[79] This protein is a target of the M. oryzae effector AVR-Pii and so this allows the NLR to monitor for Mo's attack against that target.[79]

Other major fungal and bacterial rice diseases include sheath blight (caused by Rhizoctonia solani), false smut (Ustilaginoidea virens), bacterial panicle blight (Burkholderia glumae),[80] sheath rot (Sarocladium oryzae), and bakanae (Fusarium fujikuroi).[81] Viral diseases exist, such as rice ragged stunt (vector: BPH), and tungro (vector: Nephotettix spp).[82] Many viral diseases, especially those vectored by planthoppers and leafhoppers, are major causes of losses across the world.[83] There is also an ascomycete fungus, Cochliobolus miyabeanus, that causes brown spot disease in rice.[84][85][81]

The gene OsSWEET13 produces the molecular target of the Xanthomonas oryzae pv. oryzae effector PthXo2. [86] Some cultivars carry resistance alleles.[86]

Integrated pest management

Main article: Integrated pest management

Crop protection scientists are trying to develop rice pest management techniques which are sustainable. In other words, to manage crop pests in such a manner that future crop production is not threatened.[87] Sustainable pest management is based on four principles: biodiversity, host plant resistance, [88] landscape ecology, and hierarchies in a landscape—from biological to social.[89] At present, rice pest management includes cultural techniques, pest-resistant rice varieties,[88] and pesticides (which include insecticide). Increasingly, there is evidence that farmers' pesticide applications are often unnecessary, and even facilitate pest outbreaks.[90][91][92][93] By reducing the populations of natural enemies of rice pests,[94] misuse of insecticides can actually lead to pest outbreaks.[95] The International Rice Research Institute (IRRI) demonstrated in 1993 that an 87.5% reduction in pesticide use can lead to an overall drop in pest numbers.[96] IRRI also conducted two campaigns in 1994 and 2003, respectively, which discouraged insecticide misuse and smarter pest management in Vietnam.[97][98]

Rice plants produce their own chemical defenses to protect themselves from pest attacks. Some synthetic chemicals, such as the herbicide 2,4-D, cause the plant to increase the production of certain defensive chemicals and thereby increase the plant's resistance to some types of pests.[99] Conversely, other chemicals, such as the insecticide imidacloprid, can induce changes in the gene expression of the rice that cause the plant to become more susceptible to attacks by certain types of pests.[100] 5-Alkylresorcinols are chemicals that can also be found in rice.[101]

 
Chloroxylon, the satinwood tree (rue family), is used for pest management in organic cultivation in Chhattisgarh.

Botanicals, so-called "natural pesticides", are used by some farmers in an attempt to control rice pests. Botanicals include extracts of leaves, or a mulch of the leaves themselves. Some upland rice farmers in Cambodia spread chopped leaves of the bitter bush (Chromolaena odorata) over the surface of fields after planting. This practice probably helps the soil retain moisture and thereby facilitates seed germination. Farmers also claim the leaves are a natural fertilizer and helps suppress weed and insect infestations.[102]

Among rice cultivars, there are differences in the responses to, and recovery from, pest damage.[67][103][88] Many rice varieties have been selected for resistance to insect pests.[104][105][88] Therefore, particular cultivars are recommended for areas prone to certain pest problems.[88] The genetically based ability of a rice variety to withstand pest attacks is called resistance. Three main types of plant resistance to pests are recognized as nonpreference, antibiosis, and tolerance.[106] Nonpreference (or antixenosis) describes host plants which insects prefer to avoid; antibiosis is where insect survival is reduced after the ingestion of host tissue; and tolerance is the capacity of a plant to produce high yield or retain high quality despite insect infestation.[107]

Over time, the use of pest-resistant rice varieties selects for pests that are able to overcome these mechanisms of resistance. When a rice variety is no longer able to resist pest infestations, resistance is said to have broken down. Rice varieties that can be widely grown for many years in the presence of pests and retain their ability to withstand the pests are said to have durable resistance. Mutants of popular rice varieties are regularly screened by plant breeders to discover new sources of durable resistance.[106][108]

Parasitic weeds

Rice is parasitized by the hemiparasitic eudicot weed Striga hermonthica,[109] which is of local importance for this crop.

Ecotypes and cultivars

Main article: List of rice cultivars
 
Rice seed collection from IRRI

While most rice is bred for crop quality and productivity, there are varieties selected for characteristics such as texture, smell, and firmness. There are four major categories of rice worldwide: indica, japonica, aromatic and glutinous. The different varieties of rice are not considered interchangeable, either in food preparation or agriculture, so as a result, each major variety is a completely separate market from other varieties. It is common for one variety of rice to rise in price while another one drops in price.[110]

Rice cultivars also fall into groups according to environmental conditions, season of planting, and season of harvest, called ecotypes. Some major groups are the Japan-type (grown in Japan), "buly" and "tjereh" types (Indonesia); sali (or aman—main winter crop), ahu (also aush or ghariya, summer), and boro (spring) (Bengal and Assam).[111][112] Cultivars exist that are adapted to deep flooding, and these are generally called "floating rice".[113]

The largest collection of rice cultivars is at the International Rice Research Institute[114] in the Philippines, with over 100,000 rice accessions[115] held in the International Rice Genebank.[116] Rice cultivars are often classified by their grain shapes and texture. For example, Thai Jasmine rice is long-grain and relatively less sticky, as some long-grain rice contains less amylopectin than short-grain cultivars. Chinese restaurants often serve long-grain as plain unseasoned steamed rice though short-grain rice is common as well. Japanese mochi rice and Chinese sticky rice are short-grain. Chinese people use sticky rice which is properly known as "glutinous rice" (note: glutinous refer to the glue-like characteristic of rice; does not refer to "gluten") to make zongzi. The Japanese table rice is a sticky, short-grain rice. Japanese sake rice is another kind as well.

Indian rice cultivars include long-grained and aromatic Basmati (ਬਾਸਮਤੀ) (grown in the North), long and medium-grained Patna rice, and in South India (Andhra Pradesh and Karnataka) short-grained Sona Masuri (also called as Bangaru theegalu). In the state of Tamil Nadu, the most prized cultivar is ponni which is primarily grown in the delta regions of the Kaveri River. Kaveri is also referred to as ponni in the South and the name reflects the geographic region where it is grown. In the Western Indian state of Maharashtra, a short grain variety called Ambemohar is very popular. This rice has a characteristic fragrance of Mango blossom.

Aromatic rices have definite aromas and flavors; the most noted cultivars are Thai fragrant rice, Basmati, Patna rice, Vietnamese fragrant rice, and a hybrid cultivar from America, sold under the trade name Texmati. Both Basmati and Texmati have a mild popcorn-like aroma and flavor. In Indonesia, there are also red and black cultivars.

High-yield cultivars of rice suitable for cultivation in Africa and other dry ecosystems, called the new rice for Africa (NERICA) cultivars, have been developed. It is hoped that their cultivation will improve food security in West Africa.

Draft genomes for the two most common rice cultivars, indica and japonica, were published in April 2002. Rice was chosen as a model organism for the biology of grasses because of its relatively small genome (~430 megabase pairs). Rice was the first crop with a complete genome sequence.[117]

On December 16, 2002, the UN General Assembly declared the year 2004 the International Year of Rice. The declaration was sponsored by more than 40 countries.

Varietal development has ceremonial and historical significance for some cultures (see § Culture below). The Thai kings have patronised rice breeding since at least the reign of Chulalongkorn,[118][119] and his great-great-grandson Vajiralongkorn released five particular rice varieties to celebrate his coronation.[120]

Biotechnology

High-yielding varieties

Main article: Green revolution

The high-yielding varieties are a group of crops created intentionally during the Green Revolution to increase global food production. This project enabled labor markets in Asia to shift away from agriculture, and into industrial sectors. The first "Rice Car", IR8 was produced in 1966 at the International Rice Research Institute which is based in the Philippines at the University of the Philippines' Los Baños site. IR8 was created through a cross between an Indonesian variety named "Peta" and a Chinese variety named "Dee Geo Woo Gen."[121]

Scientists have identified and cloned many genes involved in the gibberellin signaling pathway, including GAI1 (Gibberellin Insensitive) and SLR1 (Slender Rice). Disruption of gibberellin signaling can lead to significantly reduced stem growth leading to a dwarf phenotype. Photosynthetic investment in the stem is reduced dramatically as the shorter plants are inherently more stable mechanically. Assimilates become redirected to grain production, amplifying in particular the effect of chemical fertilizers on commercial yield. In the presence of nitrogen fertilizers, and intensive crop management, these varieties increase their yield two to three times.[122]

Golden rice

This section is an excerpt from Golden rice.[edit]
 
Golden rice (back) compared to white rice (front), demonstrating the distinctive golden-yellow colour of the variety

Golden rice is a variety of rice (Oryza sativa) produced through genetic engineering to biosynthesize beta-carotene, a precursor of vitamin A, in the edible parts of the rice.[123][124] It is intended to produce a fortified food to be grown and consumed in areas with a shortage of dietary vitamin A. Vitamin A deficiency causes xerophthalmia, a range of eye conditions from night blindness to more severe clinical outcomes such as keratomalacia and corneal scars, and permanent blindness. Additionally, vitamin A deficiency also increases risk of mortality from measles and diarrhea in children. In 2013, the prevalence of deficiency was the highest in sub-Saharan Africa (48%; 25–75), and South Asia (44%; 13–79).[125]

Although golden rice has met significant opposition from environmental and anti-globalisation activists, more than 100 Nobel laureates in 2016 encouraged use of genetically modified golden rice which can produce up to 23 times as much beta-carotene as the original golden rice.[126][127][128]

Expression of human proteins

Ventria Bioscience has genetically modified rice to express lactoferrin, lysozyme which are proteins usually found in breast milk, and human serum albumin, These proteins have antiviral, antibacterial, and antifungal effects.[129]

Rice containing these added proteins can be used as a component in oral rehydration solutions which are used to treat diarrheal diseases, thereby shortening their duration and reducing recurrence. Such supplements may also help reverse anemia.[130]

Flood-tolerant rice

Main article: Deepwater rice

Due to the varying levels that water can reach in regions of cultivation, flood tolerant varieties have long been developed and used. Flooding is an issue that many rice growers face, especially in South and South East Asia where flooding annually affects 20 million hectares (49 million acres).[131] Standard rice varieties cannot withstand stagnant flooding of more than about a week,[132] mainly as it disallows the plant access to necessary requirements such as sunlight and essential gas exchanges, inevitably leading to plants being unable to recover.[131] In the past, this has led to massive losses in yields, such as in the Philippines, where in 2006, rice crops worth $65 million were lost to flooding.[133] Recently developed cultivars seek to improve flood tolerance.

Drought-tolerant rice

Drought represents a significant environmental stress for rice production, with 19–23 million hectares (47–57 million acres) of rainfed rice production in South and South East Asia often at risk.[134][135] Under drought conditions, without sufficient water to afford them the ability to obtain the required levels of nutrients from the soil, conventional commercial rice varieties can be severely affected—for example, yield losses as high as 40% have affected some parts of India, with resulting losses of around US$800 million annually.[136]

The International Rice Research Institute conducts research into developing drought-tolerant rice varieties, including the varieties 5411 and Sookha dhan, currently being employed by farmers in the Philippines and Nepal respectively.[135] In addition, in 2013 the Japanese National Institute for Agrobiological Sciences led a team which successfully inserted the DEEPER ROOTING 1 (DRO1) gene, from the Philippine upland rice variety Kinandang Patong, into the popular commercial rice variety IR64, giving rise to a far deeper root system in the resulting plants.[136] This facilitates an improved ability for the rice plant to derive its required nutrients in times of drought via accessing deeper layers of soil, a feature demonstrated by trials which saw the IR64 + DRO1 rice yields drop by 10% under moderate drought conditions, compared to 60% for the unmodified IR64 variety.[136][137]

Salt-tolerant rice

Further information: Crop tolerance to seawater

Soil salinity poses a major threat to rice crop productivity, particularly along low-lying coastal areas during the dry season.[134][138] For example, roughly 1 million hectares (2.5 million acres) of the coastal areas of Bangladesh are affected by saline soils.[139] These high concentrations of salt can severely affect rice plants' normal physiology, especially during early stages of growth, and as such farmers are often forced to abandon these otherwise potentially usable areas.[140][141]

Progress has been made, however, in developing rice varieties capable of tolerating such conditions; the hybrid created from the cross between the commercial rice variety IR56 and the wild rice species Oryza coarctata is one example.[142] O. coarctata is capable of successful growth in soils with double the limit of salinity of normal varieties, but lacks the ability to produce edible rice.[142] Developed by the International Rice Research Institute, the hybrid variety can utilise specialised leaf glands that allow for the removal of salt into the atmosphere. It was initially produced from one successful embryo out of 34,000 crosses between the two species; this was then backcrossed to IR56 with the aim of preserving the genes responsible for salt tolerance that were inherited from O. coarctata.[140] Extensive trials are planned prior to the new variety being available to farmers by approximately 2017–18.[140]

 
The irrigated rice (paddy) crop in Egypt has a salt tolerance of ECe=5.5 dS/m beyond which the yield declines.[143]

Environment-friendly rice

Producing rice in paddies is harmful for the environment due to the release of methane by methanogenic bacteria. These bacteria live in the anaerobic waterlogged soil, and live off nutrients released by rice roots. Researchers have recently reported in Nature that putting the barley gene SUSIBA2 into rice creates a shift in biomass production from root to shoot (above ground tissue becomes larger, while below ground tissue is reduced), decreasing the methanogen population, and resulting in a reduction of methane emissions of up to 97%. Apart from this environmental benefit, the modification also increases the amount of rice grains by 43%, which makes it a useful tool in feeding a growing world population.[144][145]

Model organism

Rice is used as a model organism for investigating the molecular mechanisms of meiosis and DNA repair in higher plants. Meiosis is a key stage of the sexual cycle in which diploid cells in the ovule (female structure) and the anther (male structure) produce haploid cells that develop further into gametophytes and gametes. So far, 28 meiotic genes of rice have been characterized.[146] Studies of rice gene OsRAD51C showed that this gene is necessary for homologous recombinational repair of DNA, particularly the accurate repair of DNA double-strand breaks during meiosis.[147] Rice gene OsDMC1 was found to be essential for pairing of homologous chromosomes during meiosis,[148] and rice gene OsMRE11 was found to be required for both synapsis of homologous chromosomes and repair of double-strand breaks during meiosis.[149]

In human culture

 
Ancient statue of the rice goddess Dewi Sri from Java (c. 9th century)

Rice plays an important role in certain religions and popular beliefs. In many cultures relatives will scatter rice during or towards the end of a wedding ceremony in front of the bride and groom.[150]

The pounded rice ritual is conducted during weddings in Nepal. The bride gives a leafplate full of pounded rice to the groom after he requests it politely from her.[151]

In the Philippines rice wine, popularly known as tapuy, is used for important occasions such as weddings, rice harvesting ceremonies and other celebrations.[152]

Dewi Sri is the traditional rice goddess of the Javanese, Sundanese, and Balinese people in Indonesia. Most rituals involving Dewi Sri are associated with the mythical origin attributed to the rice plant, the staple food of the region.[153][154]

A 2014 study of Han Chinese communities found that a history of farming rice makes cultures more psychologically interdependent, whereas a history of farming wheat makes cultures more independent.[155]

A Royal Ploughing Ceremony is held in certain Asian countries to mark the beginning of the rice planting season. It is still honored in the kingdoms of Cambodia[156][157] and Thailand.[158] The 2,600-year-old tradition – begun by Śuddhodana in Kapilavastu – was revived in the republic of Nepal in 2017 after a lapse of a few years.[159]

Thai king Vajiralongkorn released five particular rice varieties to celebrate his coronation.[120]

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Further reading

  • Liu, Wende; Liu, Jinling; Triplett, Lindsay; Leach, Jan E.; Wang, Guo-Liang (August 4, 2014). "Novel insights into rice innate immunity against bacterial and fungal pathogens". Annual Review of Phytopathology. Annual Reviews. 52 (1): 213–241. doi:10.1146/annurev-phyto-102313-045926. PMID 24906128. S2CID 9244874.
  • Deb, D. (October 2019). "Restoring Rice Biodiversity". Scientific American. 321 (4): 54–61. India originally possessed some 110,000 landraces of rice with diverse and valuable properties. These include enrichment in vital nutrients and the ability to withstand flood, drought, salinity or pest infestations. The Green Revolution covered fields with a few high-yielding varieties, so that roughly 90 percent of the landraces vanished from farmers' collections. High-yielding varieties require expensive inputs. They perform abysmally on marginal farms or in adverse environmental conditions, forcing poor farmers into debt.
  • Singh, B.N. (2018). . New Delhi: Studium Press. ISBN 978-1-62699-107-1. Archived from the original on March 14, 2018. Retrieved March 14, 2018.

October 15, 2023
rice, other, uses, disambiguation, seed, grass, species, oryza, sativa, asian, rice, less, commonly, glaberrima, african, rice, name, wild, rice, usually, used, species, genera, zizania, porteresia, both, wild, domesticated, although, term, also, used, primiti. For other uses see Rice disambiguation Rice is the seed of the grass species Oryza sativa Asian rice or less commonly O glaberrima African rice The name wild rice is usually used for species of the genera Zizania and Porteresia both wild and domesticated although the term may also be used for primitive or uncultivated varieties of Oryza A mixture of brown white and red indica rice also containing wild rice Zizania speciesAs a cereal grain domesticated rice is the most widely consumed staple food for over half of the world s human population 1 particularly in Asia and Africa It is the agricultural commodity with the third highest worldwide production after sugarcane and maize 2 Since sizable portions of sugarcane and maize crops are used for purposes other than human consumption rice is the most important food crop with regard to human nutrition and caloric intake providing more than one fifth of the calories consumed worldwide by humans 3 There are many varieties of rice and culinary preferences tend to vary regionally The traditional method for cultivating rice is flooding the fields while or after setting the young seedlings This simple method requires sound irrigation planning but it reduces the growth of less robust weed and pest plants that have no submerged growth state and deters vermin While flooding is not mandatory for the cultivation of rice all other methods of irrigation require higher effort in weed and pest control during growth periods and a different approach for fertilizing the soil Rice a monocot is normally grown as an annual plant although in tropical areas it can survive as a perennial and can produce a ratoon crop for up to 30 years 4 Rice cultivation is well suited to countries and regions with low labor costs and high rainfall as it is labor intensive to cultivate and requires ample water However rice can be grown practically anywhere even on a steep hill or mountain area with the use of water controlling terrace systems Although its parent species are native to Asia and certain parts of Africa centuries of trade and exportation have made it commonplace in many cultures worldwide Production and consumption of rice is estimated to have been responsible for 4 of global greenhouse gas emissions in 2010 Contents 1 Characteristics 2 Food 3 Rice growing environments 4 History of cultivation 5 Production and commerce 5 1 Production 5 2 Processing 5 3 Harvesting drying and milling 5 4 Distribution 5 5 Trade 5 6 Yield records 5 7 Worldwide consumption 6 Environmental impacts 6 1 Climate change 6 2 Water usage 7 Pests and diseases 7 1 Pests 7 2 Diseases 7 3 Integrated pest management 7 4 Parasitic weeds 8 Ecotypes and cultivars 9 Biotechnology 9 1 High yielding varieties 9 2 Golden rice 9 3 Expression of human proteins 9 4 Flood tolerant rice 9 5 Drought tolerant rice 9 6 Salt tolerant rice 9 7 Environment friendly rice 10 Model organism 11 In human culture 12 See also 13 References 14 Further readingCharacteristicsThe rice plant can grow to 1 1 8 m 3 6 ft tall occasionally more depending on the variety and soil fertility It has long slender leaves 50 100 cm 20 40 in long and 2 2 5 cm 3 4 1 in broad The small wind pollinated flowers are produced in a branched arching to pendulous inflorescence 30 50 cm 12 20 in long The edible seed is a grain caryopsis 5 12 mm 3 16 15 32 in long and 2 3 mm 3 32 1 8 in thick Rice is a cereal crop belonging to the family Poecae Rice being a tropical crop can be grown during the two distinct seasons dry and wet of the year provided that moisture is made available to the crop 5 nbsp Botanical illustration nbsp Small wind pollinated flowersFoodMain article Rice as food Rice is commonly consumed as food around the world The varieties of rice are typically classified as long medium and short grained 6 The grains of long grain rice high in amylose tend to remain intact after cooking medium grain rice high in amylopectin becomes more sticky Medium grain rice is used for sweet dishes for risotto in Italy and many rice dishes such as arros negre in Spain Some varieties of long grain rice that are high in amylopectin known as Thai Sticky rice are usually steamed 7 A stickier short grain rice is used for sushi 8 the stickiness allows rice to hold its shape when cooked 9 Short grain rice is used extensively in Japan 10 including to accompany savoury dishes 11 Rice growing environmentsRice growth and production are affected by the environment soil properties biotic conditions and cultural practices Environmental factors include rainfall and water temperature photoperiod solar radiation and in some instances tropical storms Soil factors refer to soil type and their position in uplands or lowlands Biotic factors deal with weeds insects diseases and crop varieties 12 Rice can be grown in different environments depending upon water availability 13 Generally rice does not thrive in a waterlogged area yet it can survive and grow herein 14 and it can survive flooding 15 Lowland rainfed which is drought prone favors medium depth waterlogged submergence and flood prone Lowland irrigated grown in both the wet season and the dry season Deep water or floating rice Coastal wetland Upland rice also known as hill rice or Ghaiya rice History of cultivationThis section is an excerpt from History of rice cultivation edit The current scientific consensus based on archaeological and linguistic evidence is that Oryza sativa rice was first domesticated in the Yangtze River basin in China 13 500 to 8 200 years ago 16 17 18 19 Cultivation migration and trade spread rice around the world first to much of east Asia and then further abroad and eventually to the Americas as part of the Columbian exchange The now less common Oryza glaberrima rice was independently domesticated in Africa around 3 000 years ago 20 Since its spread rice has become a global staple crop important to food security and food cultures around the world Local varieties of Oryza sativa have resulted in over 40 000 cultivars of various types More recent changes in agricultural practices and breeding methods as part of the Green Revolution and other transfers of agricultural technologies has led to increased production in recent decades 21 Production and commerceRice production 2020Country Millions of tonnes nbsp China 211 9 nbsp India 178 3 nbsp Bangladesh 54 9 nbsp Indonesia 54 6 nbsp Vietnam 42 8 nbsp Thailand 30 2 nbsp Myanmar 25 1 nbsp Philippines 19 3 nbsp Brazil 11 1 nbsp Cambodia 11 0World 756 7Source FAOSTAT of the United Nations 22 Production See also List of countries by rice production nbsp Worldwide rice production nbsp Production of rice 2019 23 In 2020 world production of paddy rice was 756 7 million metric tons 834 1 million short tons 24 led by China and India with a combined 52 of this total 2 Other major producers were Bangladesh Indonesia and Vietnam The five major producers accounted for 72 of total production while the top fifteen producers accounted for 91 of total world production in 2017 Developing countries account for 95 of the total production 25 Rice is a major food staple and a mainstay for the rural population and their food security It is mainly cultivated by small farmers in holdings of less than one hectare Rice is also a wage commodity for workers in the cash crop or non agricultural sectors Rice is vital for the nutrition of much of the population in Asia as well as in Latin America and the Caribbean and in Africa it is central to the food security of over half the world population Many rice grain producing countries have significant losses post harvest at the farm and because of poor roads inadequate storage technologies inefficient supply chains and farmer s inability to bring the produce into retail markets dominated by small shopkeepers A World Bank FAO study claims 8 to 26 of rice is lost in developing nations on average every year because of post harvest problems and poor infrastructure Some sources claim the post harvest losses exceed 40 25 26 Not only do these losses reduce food security in the world the study claims that farmers in developing countries such as China India and others lose approximately US 89 billion of income in preventable post harvest farm losses poor transport the lack of proper storage and retail One study claims that if these post harvest grain losses could be eliminated with better infrastructure and retail network in India alone enough food would be saved every year to feed 70 to 100 million people 27 Processing The seeds of the rice plant are first milled using a rice huller to remove the chaff the outer husks of the grain see rice hulls At this point in the process the product is called brown rice The milling may be continued removing the bran i e the rest of the husk and the germ thereby creating white rice White rice which keeps longer lacks some important nutrients moreover in a limited diet which does not supplement the rice brown rice helps to prevent the disease beriberi Either by hand or in a rice polisher white rice may be buffed with glucose or talc powder often called polished rice though this term may also refer to white rice in general parboiled or processed into flour White rice may also be enriched by adding nutrients especially those lost during the milling process While the cheapest method of enriching involves adding a powdered blend of nutrients that will easily wash off in the United States rice which has been so treated requires a label warning against rinsing more sophisticated methods apply nutrients directly to the grain coating the grain with a water insoluble substance which is resistant to washing In some countries a popular form parboiled rice also known as converted rice and easy cook rice 28 is subjected to a steaming or parboiling process while still a brown rice grain The parboil process causes a gelatinisation of the starch in the grains The grains become less brittle and the color of the milled grain changes from white to yellow The rice is then dried and can then be milled as usual or used as brown rice Milled parboiled rice is nutritionally superior to standard milled rice because the process causes nutrients from the outer husk especially thiamine to move into the endosperm so that less is subsequently lost when the husk is polished off during milling Parboiled rice has an additional benefit in that it does not stick to the pan during cooking as happens when cooking regular white rice This type of rice is eaten in parts of India and countries of West Africa are also accustomed to consuming parboiled rice Rice bran called nuka in Japan is a valuable commodity in Asia and is used for many daily needs It is a moist oily inner layer which is heated to produce oil It is also used as a pickling bed in making rice bran pickles and takuan Raw rice may be ground into flour for many uses including making many kinds of beverages such as amazake horchata rice milk and rice wine Rice does not contain gluten so is suitable for people on a gluten free diet 29 Rice can be made into various types of noodles Raw wild or brown rice may also be consumed by raw foodist or fruitarians if soaked and sprouted usually a week to 30 days gaba rice Processed rice seeds must be boiled or steamed before eating Boiled rice may be further fried in cooking oil or butter known as fried rice or beaten in a tub to make mochi Rice is a good source of protein and a staple food in many parts of the world but it is not a complete protein it does not contain all of the essential amino acids in sufficient amounts for good health and should be combined with other sources of protein such as nuts seeds beans fish or meat 30 Rice like other cereal grains can be puffed or popped This process takes advantage of the grains water content and typically involves heating grains in a special chamber Further puffing is sometimes accomplished by processing puffed pellets in a low pressure chamber The ideal gas law means either lowering the local pressure or raising the water temperature results in an increase in volume prior to water evaporation resulting in a puffy texture Bulk raw rice density is about 0 9 g cm3 It decreases to less than one tenth that when puffed nbsp Rice processing A Rice with chaffB Brown riceC Rice with germD White rice with bran residueE Polished 1 Chaff 2 Bran 3 Bran residue 4 Cereal germ 5 Endosperm nbsp Unmilled to milled Japanese rice from left to right brown rice rice with germ white riceHarvesting drying and milling Further information Paddy field Unmilled rice known as paddy Indonesia and Malaysia padi Philippines palay is usually harvested when the grains have a moisture content of around 25 In most Asian countries where rice is almost entirely the product of smallholder agriculture harvesting is carried out manually although there is a growing interest in mechanical harvesting Harvesting can be carried out by the farmers themselves but is also frequently done by seasonal labor groups Harvesting is followed by threshing either immediately or within a day or two Again much threshing is still carried out by hand but there is an increasing use of mechanical threshers Subsequently paddy needs to be dried to bring down the moisture content to no more than 20 for milling A familiar sight in several Asian countries is paddy laid out to dry along roads However in most countries the bulk of drying of marketed paddy takes place in mills with village level drying being used for paddy to be consumed by farm families Mills either sun dry or use mechanical driers or both Drying has to be carried out quickly to avoid the formation of molds Mills range from simple hullers with a throughput of a couple of tonnes a day that simply remove the outer husk to enormous operations that can process 4 thousand metric tons 4 4 thousand short tons a day and produce highly polished rice A good mill can achieve a paddy to rice conversion rate of up to 72 but smaller inefficient mills often struggle to achieve 60 These smaller mills often do not buy paddy and sell rice but only service farmers who want to mill their paddy for their own consumption nbsp Rice combine harvester in Katori Chiba Prefecture Japan nbsp After the harvest rice straw is gathered in the traditional way from small paddy fields in Mae Wang District Thailand nbsp Burning of rice residues after harvest to quickly prepare the land for wheat planting around Sangrur India nbsp Drying rice in Peravoor IndiaDistribution Because of the importance of rice to human nutrition and food security in Asia the domestic rice markets tend to be subject to considerable state involvement While the private sector plays a leading role in most countries agencies such as BULOG in Indonesia the NFA in the Philippines VINAFOOD in Vietnam and the Food Corporation of India are all heavily involved in purchasing of paddy from farmers or rice from mills and in distributing rice to poorer people BULOG and NFA monopolise rice imports into their countries while VINAFOOD controls all exports from Vietnam 31 Trade World trade figures are much smaller than those for production as less than 8 of rice produced is traded internationally 32 In economic terms the global rice trade was a small fraction of 1 of world mercantile trade Many countries consider rice as a strategic food staple and various governments subject its trade to a wide range of controls and interventions Developing countries are the main players in the world rice trade accounting for 83 of exports and 85 of imports While there are numerous importers of rice the exporters of rice are limited Just five countries Thailand Vietnam China the United States and India in decreasing order of exported quantities accounted for about three quarters of world rice exports in 2002 25 However this ranking has been rapidly changing in recent years In 2010 the three largest exporters of rice in decreasing order of quantity exported were Thailand Vietnam and India By 2012 India became the largest exporter of rice with a 100 increase in its exports on year to year basis and Thailand slipped to third position 33 34 Together Thailand Vietnam and India accounted for nearly 70 of the world rice exports The primary variety exported by Thailand and Vietnam were Jasmine rice while exports from India included aromatic Basmati variety China an exporter of rice in the early 2000s had become a net importer of rice by 2010 32 35 According to a USDA report the world s largest exporters of rice in 2012 were India 9 75 million metric tons 10 75 million short tons Vietnam 7 million metric tons 7 7 million short tons Thailand 6 5 million metric tons 7 2 million short tons Pakistan 3 75 million metric tons 4 13 million short tons and the United States 3 5 million metric tons 3 9 million short tons 36 Major importers usually include Nigeria Indonesia Bangladesh Saudi Arabia Iran Iraq Malaysia the Philippines Brazil and some African and Persian Gulf countries In common with other West African countries Nigeria is actively promoting domestic production However its very heavy import duties 110 open it to smuggling from neighboring countries 37 Parboiled rice is particularly popular in Nigeria Although China and India are the two largest producers of rice in the world both countries consume the majority of the rice produced domestically leaving little to be traded internationally Yield records The average world yield for rice was 4 3 metric tons per hectare 1 9 short tons per acre in 2010 Australian rice farms were the most productive in 2010 with a nationwide average of 10 8 metric tons per hectare 4 8 short tons per acre 38 Yuan Longping of China National Hybrid Rice Research and Development Center set a world record for rice yield in 2010 at 19 metric tons per hectare 8 5 short tons per acre on a demonstration plot In 2011 this record was reportedly surpassed by an Indian farmer Sumant Kumar with 22 4 metric tons per hectare 10 0 short tons per acre in Bihar although this claim has been disputed by both Yuan and India s Central Rice Research Institute These efforts employed newly developed rice breeds and System of Rice Intensification SRI a recent innovation in rice farming 39 40 41 42 Worldwide consumption This section needs to be updated Please help update this article to reflect recent events or newly available information January 2023 Food consumption of rice in 2013 millions of metric tons of paddy equivalent 43 nbsp China 162 4 nbsp India 130 4 nbsp Indonesia 50 4 nbsp Bangladesh 40 3 nbsp Vietnam 19 9 nbsp Philippines 17 6 nbsp Thailand 11 5 nbsp Japan 11 4As of 2013 update world food consumption of rice was 565 6 million metric tons 623 5 million short tons of paddy equivalent 377 283 metric tons 415 883 short tons of milled equivalent while the largest consumers were China consuming 162 4 million metric tons 179 0 million short tons of paddy equivalent 28 7 of world consumption and India consuming 130 4 million metric tons 143 7 million short tons of paddy equivalent 23 1 of world consumption 43 Between 1961 and 2002 per capita consumption of rice increased by 40 worldwide 44 Rice is the most important crop in Asia In Cambodia for example 90 of the total agricultural area is used for rice production 45 Per capita Bangladesh ranks as the country with the highest rice consumption followed by Laos Cambodia Vietnam and Indonesia 46 U S rice consumption has risen sharply over the past 25 years fueled in part by commercial applications such as beer production 47 Almost one in five adult Americans now report eating at least half a serving of white or brown rice per day 48 Environmental impacts nbsp Work by the International Center for Tropical Agriculture to measure the greenhouse gas emissions of rice production Climate change The worldwide production of rice accounts for more greenhouse gas emissions GHG in total than that of any other plant food 49 It was estimated in 2021 to be responsible for 30 of agricultural methane emissions and 11 of agricultural nitrous oxide emissions 50 Methane release is caused by long term flooding of rice fields inhibiting the soil from absorbing atmospheric oxygen a process causing anaerobic fermentation of organic matter in the soil 51 A 2021 study estimated that rice contributed 2 billion tonnes of anthropogenic greenhouse gases in 2010 49 of the 47 billion total 52 The study added up GHG emissions from the entire lifecycle including production transportation and consumption and compared the global totals of different foods 53 The total for rice was half the total for beef 49 A 2010 study found that as a result of rising temperatures and decreasing solar radiation during the later years of the 20th century the rice yield growth rate has decreased in many parts of Asia compared to what would have been observed had the temperature and solar radiation trends not occurred 54 55 The yield growth rate had fallen 10 20 at some locations The study was based on records from 227 farms in Thailand Vietnam Nepal India China Bangladesh and Pakistan The mechanism of this falling yield was not clear but might involve increased respiration during warm nights which expends energy without being able to photosynthesize More detailed analysis of rice yields by the International Rice Research Institute forecast 20 reduction in yields in Asia per degree Celsius of temperature rise Rice becomes sterile if exposed to temperatures above 35 C 95 F for more than one hour during flowering and consequently produces no grain 56 57 Water usage Rice requires slightly more water to produce than other grains 58 Rice production uses almost a third of Earth s fresh water 59 Water outflows from rice fields through transpiration evaporation seepage and percolation 60 It is estimated that it takes about 2 500 litres 660 US gal of water need to be supplied to account for all of these outflows and produce 1 kilogram 2 lb 3 oz of rice 60 Pests and diseasesRice pests are animals which have the potential to reduce the yield or value of the rice crop or of rice seeds plants are described as weeds while microbes are described as pathogens disease causing organisms 61 Rice pests include insects nematodes rodents and birds A variety of factors can contribute to pest outbreaks including climatic factors improper irrigation the overuse of insecticides and high rates of nitrogen fertilizer application 62 Weather conditions also contribute to pest outbreaks For example rice gall midge and army worm outbreaks tend to follow periods of high rainfall early in the wet season while thrips outbreaks are associated with drought 63 Pests nbsp Chinese rice grasshopper Oxya chinensis Borneo MalaysiaMajor rice insect pests include the brown planthopper BPH 64 several species of stemborers including those in the genera Scirpophaga and Chilo 65 the rice gall midge 66 several species of rice bugs 67 notably in the genus Leptocorisa 68 defoliators such as the rice leafroller hispa and grasshoppers 69 The fall army worm a species of Lepidoptera also targets and causes damage to rice crops 70 Rice weevils attack stored produce Several nematode species infect rice crops causing diseases such as ufra Ditylenchus dipsaci white tip disease Aphelenchoide bessei and root knot disease Meloidogyne graminicola Some nematode species such as Pratylenchus spp are most damaging to upland rice of all parts of the world Rice root nematode Hirschmanniella oryzae is a migratory endoparasite which on higher inoculum levels leads to complete destruction of a rice crop Beyond being obligate parasites they decrease the vigor of plants and increase the plants susceptibility to other pests and diseases 71 72 Other pests include the apple snail Pomacea canaliculata panicle rice mite rats 73 and the weed Echinochloa crus galli 74 Diseases Main article List of rice diseases Rice blast caused by the fungus Magnaporthe grisea syn M oryzae Pyricularia oryzae 75 is the most significant disease affecting rice cultivation It and bacterial leaf streak caused by Xanthomonas oryzae pv oryzae are perennially the two worst rice diseases worldwide and such is their importance and the importance of rice that they are both among the worst 10 diseases of all plants 76 A 2010 review reported clones for quantitative disease resistance in plants 77 The plant responds to the blast pathogen by releasing jasmonic acid which then cascades into the activation of further downstream metabolic pathways which produce the defense response 78 This accumulates as methyl jasmonic acid 78 The pathogen responds by synthesizing an oxidizing enzyme which prevents this accumlation and its resulting alarm signal 78 OsPii 2 was discovered by Fujisaki et al 2017 79 It is a nucleotide binding leucine rich repeat receptor NB LRR NLR an immunoreceptor 79 It includes an NOI domain NO3 induced which binds rice s own Exo70 F3 protein 79 This protein is a target of the M oryzae effector AVR Pii and so this allows the NLR to monitor for Mo s attack against that target 79 Other major fungal and bacterial rice diseases include sheath blight caused by Rhizoctonia solani false smut Ustilaginoidea virens bacterial panicle blight Burkholderia glumae 80 sheath rot Sarocladium oryzae and bakanae Fusarium fujikuroi 81 Viral diseases exist such as rice ragged stunt vector BPH and tungro vector Nephotettix spp 82 Many viral diseases especially those vectored by planthoppers and leafhoppers are major causes of losses across the world 83 There is also an ascomycete fungus Cochliobolus miyabeanus that causes brown spot disease in rice 84 85 81 The gene OsSWEET13 produces the molecular target of the Xanthomonas oryzae pv oryzae effector PthXo2 86 Some cultivars carry resistance alleles 86 Integrated pest management Main article Integrated pest management Crop protection scientists are trying to develop rice pest management techniques which are sustainable In other words to manage crop pests in such a manner that future crop production is not threatened 87 Sustainable pest management is based on four principles biodiversity host plant resistance 88 landscape ecology and hierarchies in a landscape from biological to social 89 At present rice pest management includes cultural techniques pest resistant rice varieties 88 and pesticides which include insecticide Increasingly there is evidence that farmers pesticide applications are often unnecessary and even facilitate pest outbreaks 90 91 92 93 By reducing the populations of natural enemies of rice pests 94 misuse of insecticides can actually lead to pest outbreaks 95 The International Rice Research Institute IRRI demonstrated in 1993 that an 87 5 reduction in pesticide use can lead to an overall drop in pest numbers 96 IRRI also conducted two campaigns in 1994 and 2003 respectively which discouraged insecticide misuse and smarter pest management in Vietnam 97 98 Rice plants produce their own chemical defenses to protect themselves from pest attacks Some synthetic chemicals such as the herbicide 2 4 D cause the plant to increase the production of certain defensive chemicals and thereby increase the plant s resistance to some types of pests 99 Conversely other chemicals such as the insecticide imidacloprid can induce changes in the gene expression of the rice that cause the plant to become more susceptible to attacks by certain types of pests 100 5 Alkylresorcinols are chemicals that can also be found in rice 101 nbsp Chloroxylon the satinwood tree rue family is used for pest management in organic cultivation in Chhattisgarh Botanicals so called natural pesticides are used by some farmers in an attempt to control rice pests Botanicals include extracts of leaves or a mulch of the leaves themselves Some upland rice farmers in Cambodia spread chopped leaves of the bitter bush Chromolaena odorata over the surface of fields after planting This practice probably helps the soil retain moisture and thereby facilitates seed germination Farmers also claim the leaves are a natural fertilizer and helps suppress weed and insect infestations 102 Among rice cultivars there are differences in the responses to and recovery from pest damage 67 103 88 Many rice varieties have been selected for resistance to insect pests 104 105 88 Therefore particular cultivars are recommended for areas prone to certain pest problems 88 The genetically based ability of a rice variety to withstand pest attacks is called resistance Three main types of plant resistance to pests are recognized as nonpreference antibiosis and tolerance 106 Nonpreference or antixenosis describes host plants which insects prefer to avoid antibiosis is where insect survival is reduced after the ingestion of host tissue and tolerance is the capacity of a plant to produce high yield or retain high quality despite insect infestation 107 Over time the use of pest resistant rice varieties selects for pests that are able to overcome these mechanisms of resistance When a rice variety is no longer able to resist pest infestations resistance is said to have broken down Rice varieties that can be widely grown for many years in the presence of pests and retain their ability to withstand the pests are said to have durable resistance Mutants of popular rice varieties are regularly screened by plant breeders to discover new sources of durable resistance 106 108 Parasitic weeds Rice is parasitized by the hemiparasitic eudicot weed Striga hermonthica 109 which is of local importance for this crop Ecotypes and cultivarsMain article List of rice cultivars nbsp Rice seed collection from IRRIWhile most rice is bred for crop quality and productivity there are varieties selected for characteristics such as texture smell and firmness There are four major categories of rice worldwide indica japonica aromatic and glutinous The different varieties of rice are not considered interchangeable either in food preparation or agriculture so as a result each major variety is a completely separate market from other varieties It is common for one variety of rice to rise in price while another one drops in price 110 Rice cultivars also fall into groups according to environmental conditions season of planting and season of harvest called ecotypes Some major groups are the Japan type grown in Japan buly and tjereh types Indonesia sali or aman main winter crop ahu also aush or ghariya summer and boro spring Bengal and Assam 111 112 Cultivars exist that are adapted to deep flooding and these are generally called floating rice 113 The largest collection of rice cultivars is at the International Rice Research Institute 114 in the Philippines with over 100 000 rice accessions 115 held in the International Rice Genebank 116 Rice cultivars are often classified by their grain shapes and texture For example Thai Jasmine rice is long grain and relatively less sticky as some long grain rice contains less amylopectin than short grain cultivars Chinese restaurants often serve long grain as plain unseasoned steamed rice though short grain rice is common as well Japanese mochi rice and Chinese sticky rice are short grain Chinese people use sticky rice which is properly known as glutinous rice note glutinous refer to the glue like characteristic of rice does not refer to gluten to make zongzi The Japanese table rice is a sticky short grain rice Japanese sake rice is another kind as well Indian rice cultivars include long grained and aromatic Basmati ਬ ਸਮਤ grown in the North long and medium grained Patna rice and in South India Andhra Pradesh and Karnataka short grained Sona Masuri also called as Bangaru theegalu In the state of Tamil Nadu the most prized cultivar is ponni which is primarily grown in the delta regions of the Kaveri River Kaveri is also referred to as ponni in the South and the name reflects the geographic region where it is grown In the Western Indian state of Maharashtra a short grain variety called Ambemohar is very popular This rice has a characteristic fragrance of Mango blossom Aromatic rices have definite aromas and flavors the most noted cultivars are Thai fragrant rice Basmati Patna rice Vietnamese fragrant rice and a hybrid cultivar from America sold under the trade name Texmati Both Basmati and Texmati have a mild popcorn like aroma and flavor In Indonesia there are also red and black cultivars High yield cultivars of rice suitable for cultivation in Africa and other dry ecosystems called the new rice for Africa NERICA cultivars have been developed It is hoped that their cultivation will improve food security in West Africa Draft genomes for the two most common rice cultivars indica and japonica were published in April 2002 Rice was chosen as a model organism for the biology of grasses because of its relatively small genome 430 megabase pairs Rice was the first crop with a complete genome sequence 117 On December 16 2002 the UN General Assembly declared the year 2004 the International Year of Rice The declaration was sponsored by more than 40 countries Varietal development has ceremonial and historical significance for some cultures see Culture below The Thai kings have patronised rice breeding since at least the reign of Chulalongkorn 118 119 and his great great grandson Vajiralongkorn released five particular rice varieties to celebrate his coronation 120 BiotechnologyHigh yielding varieties Main article Green revolution The high yielding varieties are a group of crops created intentionally during the Green Revolution to increase global food production This project enabled labor markets in Asia to shift away from agriculture and into industrial sectors The first Rice Car IR8 was produced in 1966 at the International Rice Research Institute which is based in the Philippines at the University of the Philippines Los Banos site IR8 was created through a cross between an Indonesian variety named Peta and a Chinese variety named Dee Geo Woo Gen 121 Scientists have identified and cloned many genes involved in the gibberellin signaling pathway including GAI1 Gibberellin Insensitive and SLR1 Slender Rice Disruption of gibberellin signaling can lead to significantly reduced stem growth leading to a dwarf phenotype Photosynthetic investment in the stem is reduced dramatically as the shorter plants are inherently more stable mechanically Assimilates become redirected to grain production amplifying in particular the effect of chemical fertilizers on commercial yield In the presence of nitrogen fertilizers and intensive crop management these varieties increase their yield two to three times 122 Golden rice This section is an excerpt from Golden rice edit nbsp Golden rice back compared to white rice front demonstrating the distinctive golden yellow colour of the varietyGolden rice is a variety of rice Oryza sativa produced through genetic engineering to biosynthesize beta carotene a precursor of vitamin A in the edible parts of the rice 123 124 It is intended to produce a fortified food to be grown and consumed in areas with a shortage of dietary vitamin A Vitamin A deficiency causes xerophthalmia a range of eye conditions from night blindness to more severe clinical outcomes such as keratomalacia and corneal scars and permanent blindness Additionally vitamin A deficiency also increases risk of mortality from measles and diarrhea in children In 2013 the prevalence of deficiency was the highest in sub Saharan Africa 48 25 75 and South Asia 44 13 79 125 Although golden rice has met significant opposition from environmental and anti globalisation activists more than 100 Nobel laureates in 2016 encouraged use of genetically modified golden rice which can produce up to 23 times as much beta carotene as the original golden rice 126 127 128 Expression of human proteins Ventria Bioscience has genetically modified rice to express lactoferrin lysozyme which are proteins usually found in breast milk and human serum albumin These proteins have antiviral antibacterial and antifungal effects 129 Rice containing these added proteins can be used as a component in oral rehydration solutions which are used to treat diarrheal diseases thereby shortening their duration and reducing recurrence Such supplements may also help reverse anemia 130 Flood tolerant rice Main article Deepwater rice Due to the varying levels that water can reach in regions of cultivation flood tolerant varieties have long been developed and used Flooding is an issue that many rice growers face especially in South and South East Asia where flooding annually affects 20 million hectares 49 million acres 131 Standard rice varieties cannot withstand stagnant flooding of more than about a week 132 mainly as it disallows the plant access to necessary requirements such as sunlight and essential gas exchanges inevitably leading to plants being unable to recover 131 In the past this has led to massive losses in yields such as in the Philippines where in 2006 rice crops worth 65 million were lost to flooding 133 Recently developed cultivars seek to improve flood tolerance Drought tolerant rice Drought represents a significant environmental stress for rice production with 19 23 million hectares 47 57 million acres of rainfed rice production in South and South East Asia often at risk 134 135 Under drought conditions without sufficient water to afford them the ability to obtain the required levels of nutrients from the soil conventional commercial rice varieties can be severely affected for example yield losses as high as 40 have affected some parts of India with resulting losses of around US 800 million annually 136 The International Rice Research Institute conducts research into developing drought tolerant rice varieties including the varieties 5411 and Sookha dhan currently being employed by farmers in the Philippines and Nepal respectively 135 In addition in 2013 the Japanese National Institute for Agrobiological Sciences led a team which successfully inserted the DEEPER ROOTING 1 DRO1 gene from the Philippine upland rice variety Kinandang Patong into the popular commercial rice variety IR64 giving rise to a far deeper root system in the resulting plants 136 This facilitates an improved ability for the rice plant to derive its required nutrients in times of drought via accessing deeper layers of soil a feature demonstrated by trials which saw the IR64 DRO1 rice yields drop by 10 under moderate drought conditions compared to 60 for the unmodified IR64 variety 136 137 Salt tolerant rice Further information Crop tolerance to seawater Soil salinity poses a major threat to rice crop productivity particularly along low lying coastal areas during the dry season 134 138 For example roughly 1 million hectares 2 5 million acres of the coastal areas of Bangladesh are affected by saline soils 139 These high concentrations of salt can severely affect rice plants normal physiology especially during early stages of growth and as such farmers are often forced to abandon these otherwise potentially usable areas 140 141 Progress has been made however in developing rice varieties capable of tolerating such conditions the hybrid created from the cross between the commercial rice variety IR56 and the wild rice species Oryza coarctata is one example 142 O coarctata is capable of successful growth in soils with double the limit of salinity of normal varieties but lacks the ability to produce edible rice 142 Developed by the International Rice Research Institute the hybrid variety can utilise specialised leaf glands that allow for the removal of salt into the atmosphere It was initially produced from one successful embryo out of 34 000 crosses between the two species this was then backcrossed to IR56 with the aim of preserving the genes responsible for salt tolerance that were inherited from O coarctata 140 Extensive trials are planned prior to the new variety being available to farmers by approximately 2017 18 140 nbsp The irrigated rice paddy crop in Egypt has a salt tolerance of ECe 5 5 dS m beyond which the yield declines 143 Environment friendly rice Producing rice in paddies is harmful for the environment due to the release of methane by methanogenic bacteria These bacteria live in the anaerobic waterlogged soil and live off nutrients released by rice roots Researchers have recently reported in Nature that putting the barley gene SUSIBA2 into rice creates a shift in biomass production from root to shoot above ground tissue becomes larger while below ground tissue is reduced decreasing the methanogen population and resulting in a reduction of methane emissions of up to 97 Apart from this environmental benefit the modification also increases the amount of rice grains by 43 which makes it a useful tool in feeding a growing world population 144 145 Model organismRice is used as a model organism for investigating the molecular mechanisms of meiosis and DNA repair in higher plants Meiosis is a key stage of the sexual cycle in which diploid cells in the ovule female structure and the anther male structure produce haploid cells that develop further into gametophytes and gametes So far 28 meiotic genes of rice have been characterized 146 Studies of rice gene OsRAD51C showed that this gene is necessary for homologous recombinational repair of DNA particularly the accurate repair of DNA double strand breaks during meiosis 147 Rice gene OsDMC1 was found to be essential for pairing of homologous chromosomes during meiosis 148 and rice gene OsMRE11 was found to be required for both synapsis of homologous chromosomes and repair of double strand breaks during meiosis 149 In human culture nbsp Ancient statue of the rice goddess Dewi Sri from Java c 9th century Rice plays an important role in certain religions and popular beliefs In many cultures relatives will scatter rice during or towards the end of a wedding ceremony in front of the bride and groom 150 The 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24906128 S2CID 9244874 Deb D October 2019 Restoring Rice Biodiversity Scientific American 321 4 54 61 India originally possessed some 110 000 landraces of rice with diverse and valuable properties These include enrichment in vital nutrients and the ability to withstand flood drought salinity or pest infestations The Green Revolution covered fields with a few high yielding varieties so that roughly 90 percent of the landraces vanished from farmers collections High yielding varieties require expensive inputs They perform abysmally on marginal farms or in adverse environmental conditions forcing poor farmers into debt Singh B N 2018 Global Rice Cultivation amp Cultivars New Delhi Studium Press ISBN 978 1 62699 107 1 Archived from the original on March 14 2018 Retrieved March 14 2018 Retrieved from https en wikipedia org w index php title Rice amp oldid 1179973057, wikipedia, wiki, book, books, library,

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