Ergastic substances are non-protoplasmic materials found in cells.[1] The living protoplasm of a cell is sometimes called the bioplasm and distinct from the ergastic substances of the cell. The latter are usually organic or inorganic substances that are products of metabolism, and include crystals, oil drops, gums, tannins, resins and other compounds that can aid the organism in defense, maintenance of cellular structure, or just substance storage. Ergastic substances may appear in the protoplasm, in vacuoles, or in the cell wall.
Reserve carbohydrate of plants are the derivatives of the end products of photosynthesis. Cellulose and starch are the main ergastic substances of plant cells. Cellulose is the chief component of the cell wall, and starch occurs as a reserve material in the protoplasm.
Although proteins are the main component of living protoplasm, proteins can occur as inactive, ergastic bodies—in an amorphous or crystalline (or crystalloid) form. A well-known amorphous ergastic protein is gluten.
Fats and oilsedit
Fats (lipids) and oils are widely distributed in plant tissues. Substances related to fats—waxes, suberin, and cutin—occur as protective layers in or on the cell wall.
Crystalsedit
Animals eliminate excess inorganic materials; plants mostly deposit such material in their tissues. Such mineral matter is mostly salts of calcium and anhydrides of silica.
Raphides are a type of elongated crystalline form of calcium oxalate aggregated in bundles within a plant cell. Because of the needle-like form, large numbers in the tissue of, say, a leaf can render the leaf unpalatable to herbivores (see Dieffenbachia and taro).
^Pritchard, Seth; Peterson, C.; Runion, G. Brett; Prior, Stephen; Rogers, Hugo (1997-09-01). "Atmospheric CO2 concentration, N availability, and water status affect patterns of ergastic substance deposition in longleaf pine (Pinus palustris Mill.) foliage". Trees. 11 (8): 494–503. doi:10.1007/PL00009689. ISSN 1432-2285.
April 10, 2024
ergastic, substance, protoplasmic, materials, found, cells, living, protoplasm, cell, sometimes, called, bioplasm, distinct, from, ergastic, substances, cell, latter, usually, organic, inorganic, substances, that, products, metabolism, include, crystals, drops. Ergastic substances are non protoplasmic materials found in cells 1 The living protoplasm of a cell is sometimes called the bioplasm and distinct from the ergastic substances of the cell The latter are usually organic or inorganic substances that are products of metabolism and include crystals oil drops gums tannins resins and other compounds that can aid the organism in defense maintenance of cellular structure or just substance storage Ergastic substances may appear in the protoplasm in vacuoles or in the cell wall Contents 1 Carbohydrates 2 Proteins 3 Fats and oils 4 Crystals 5 ReferencesCarbohydrates editReserve carbohydrate of plants are the derivatives of the end products of photosynthesis Cellulose and starch are the main ergastic substances of plant cells Cellulose is the chief component of the cell wall and starch occurs as a reserve material in the protoplasm Starch as starch grains arise almost exclusively in plastids especially leucoplasts and amyloplasts Proteins editAlthough proteins are the main component of living protoplasm proteins can occur as inactive ergastic bodies in an amorphous or crystalline or crystalloid form A well known amorphous ergastic protein is gluten Fats and oils editFats lipids and oils are widely distributed in plant tissues Substances related to fats waxes suberin and cutin occur as protective layers in or on the cell wall Crystals editAnimals eliminate excess inorganic materials plants mostly deposit such material in their tissues Such mineral matter is mostly salts of calcium and anhydrides of silica Raphides are a type of elongated crystalline form of calcium oxalate aggregated in bundles within a plant cell Because of the needle like form large numbers in the tissue of say a leaf can render the leaf unpalatable to herbivores see Dieffenbachia and taro Druse CystolithReferences edit Pritchard Seth Peterson C Runion G Brett Prior Stephen Rogers Hugo 1997 09 01 Atmospheric CO2 concentration N availability and water status affect patterns of ergastic substance deposition in longleaf pine Pinus palustris Mill foliage Trees 11 8 494 503 doi 10 1007 PL00009689 ISSN 1432 2285 Retrieved from https en wikipedia org w index php title Ergastic substance amp oldid 1128161709, wikipedia, wiki, book, books, library,
