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Forma specialis

Forma specialis (plural: formae speciales), abbreviated f. sp. (plural ff. spp.) without italics, is an informal taxonomic grouping allowed by the International Code of Nomenclature for algae, fungi, and plants,[1] that is applied to a parasite (most frequently a fungus) which is adapted to a specific host. This classification may be applied by authors who do not feel that a subspecies or variety name is appropriate, and it is therefore not necessary to specify morphological differences that distinguish this form. The literal meaning of the term is 'special form', but this grouping does not correspond to the more formal botanical use of the taxonomic rank of forma or form.

LifeDomainKingdomPhylumClassOrderFamilyGenusSpecies
The hierarchy of biological classification's eight major taxonomic ranks. Intermediate minor rankings are not shown.

An example is Puccinia graminis f. sp. avenae, which affects oats.[citation needed]

An alternative term in contexts not related to biological nomenclature is physiological race (sometimes also given as biological race, and in that context treated as synonymous with biological form),[2][3] except in that the name of a race is added after the binomial scientific name (and may be arbitrary, e.g. an alphanumeric code, usually with the word "race"), e.g. "Podosphaera xanthii race S".[4] A forma specialis is used as part of the infraspecific scientific name (and follows Latin-based scientific naming conventions), inserted after the interpolation "f. sp.", as in the "Puccinia graminis f. sp. avenae" example.

History, and use with "pathotype" edit

The forma specialis category was introduced and recommended in the International Code of Botanical Nomenclature of 1930, but was not widely adopted.[5] Fungal pathogens within Alternaria alternata species have also been called pathotypes (not to be confused with pathotype as used in bacteriology) by author Syoyo Nishimura[6] who stated:

"[E]ach pathogen should be called a distinct pathotype of A. alternata"[7]

Some authors have subsequently used forma specialis and "pathotype" together for the species A. alternata:

"Currently there are seven pathotypes of A. alternata described ..., but this term is not widely adopted. ... To further standardise the taxonomic terms used, the trinomial system introduced by Rotem (1994)[8] is favoured. When differences in host affinity are observed within the isolates of one ... species, the third epithet, the forma specialis, defines the affinity to this specific host in accordance with the produced toxin causing this affinity. When different toxins are produced on the same host, but these toxins affect different host species, the term pathotype should be used in addition. All isolates which are not confined to specific hosts and / or toxins should retain only the binomial name until such specificity is found."[9]

See also edit

References edit

  1. ^ McNeill, J.; Barrie, F.R.; Buck, W.R.; Demoulin, V.; Greuter, W.; Hawksworth, D.L.; Herendeen, P.S.; Knapp, S.; Marhold, K.; Prado, J.; Prud'homme Van Reine, W.F.; Smith, G.F.; Wiersema, J.H.; Turland, N.J. (2012). International Code of Nomenclature for algae, fungi, and plants (Melbourne Code) adopted by the Eighteenth International Botanical Congress Melbourne, Australia, July 2011. Vol. Regnum Vegetabile 154. A.R.G. Gantner Verlag KG. ISBN 978-3-87429-425-6. Chapter I. Article 4.4. Note 4.
  2. ^ Walker, Peter M. B., ed. (2004) [1999]. "Biological form". Chambers Dictionary of Science and Technology. Edinburgh / New Delhi: Chambers Harrap / Allied Chambers. Previously: The Wordsworth Dictionary of Science and Technology. W. R. Chambers / Cambridge U. Pr. 1998.
  3. ^ Walker, Peter M. B., ed. (2004) [1999]. "Biological race". Chambers Dictionary of Science and Technology. Edinburgh / New Delhi: Chambers Harrap / Allied Chambers. Previously: The Wordsworth Dictionary of Science and Technology. W. R. Chambers / Cambridge U. Pr. 1998.
  4. ^ Cohen, R.; Burger, Y.; Katzir, N. (2004). "Monitoring Physiological races of Podosphaera xanthii (syn. Sphaerotheca fuliginea), the Causal Agent of Powdery Mildew in Curcubits: Factors Affecting Race Identification and the Importance for Research and Commerce". Phythoparasitica. 32 (2): 174–183. doi:10.1007/bf02979784. S2CID 27174422.
  5. ^ Hagborg, W.A.F. (1942), "Classification revision in Xanthomonas translucens", Canadian Journal of Research, 20c (5): 312–326, doi:10.1139/cjr42c-028
  6. ^ Nishimura, S.; Kohmoto, K. (1983), "Host-Specific Toxins and Chemical Structures from Alternaria Species", Annual Review of Phytopathology, 21 (1): 87–116, doi:10.1146/annurev.py.21.090183.000511, PMID 25946338
  7. ^ Nishimura, Syoyo (1980), "Host Specific Toxins from Alternaria alternata: Problems and Prospects", Proceedings of the Japan Academy, Series B, 56 (6): 362–366, Bibcode:1980PJAB...56..362N, doi:10.2183/pjab.56.362
  8. ^ Rotem, J. (1994), The Genus Alternaria: Biology, Epidemiology and Pathogenicity (as cited by Woudenberg et al. 2015), APS Press, American Phytopathological Society, ISBN 9780890541524
  9. ^ Woudenberg, J.H.C.; Seidl, M.F.; Groenewald, J.Z.; de Vries, M.; Stielow, J.B.; Thomma, B.P.H.J.; Crous, P.W. (2015), "Alternaria section Alternaria: Species, formae speciales or pathotypes?", Studies in Mycology, 82: 1–21, doi:10.1016/j.simyco.2015.07.001, PMC 4774270, PMID 26951037

forma, specialis, plural, formae, speciales, abbreviated, plural, without, italics, informal, taxonomic, grouping, allowed, international, code, nomenclature, algae, fungi, plants, that, applied, parasite, most, frequently, fungus, which, adapted, specific, ho. Forma specialis plural formae speciales abbreviated f sp plural ff spp without italics is an informal taxonomic grouping allowed by the International Code of Nomenclature for algae fungi and plants 1 that is applied to a parasite most frequently a fungus which is adapted to a specific host This classification may be applied by authors who do not feel that a subspecies or variety name is appropriate and it is therefore not necessary to specify morphological differences that distinguish this form The literal meaning of the term is special form but this grouping does not correspond to the more formal botanical use of the taxonomic rank of forma or form The hierarchy of biological classification s eight major taxonomic ranks Intermediate minor rankings are not shown An example is Puccinia graminis f sp avenae which affects oats citation needed An alternative term in contexts not related to biological nomenclature is physiological race sometimes also given as biological race and in that context treated as synonymous with biological form 2 3 except in that the name of a race is added after the binomial scientific name and may be arbitrary e g an alphanumeric code usually with the word race e g Podosphaera xanthii race S 4 A forma specialis is used as part of the infraspecific scientific name and follows Latin based scientific naming conventions inserted after the interpolation f sp as in the Puccinia graminis f sp avenae example History and use with pathotype editThe forma specialis category was introduced and recommended in the International Code of Botanical Nomenclature of 1930 but was not widely adopted 5 Fungal pathogens within Alternaria alternata species have also been called pathotypes not to be confused with pathotype as used in bacteriology by author Syoyo Nishimura 6 who stated E ach pathogen should be called a distinct pathotype of A alternata 7 Some authors have subsequently used forma specialis and pathotype together for the species A alternata Currently there are seven pathotypes of A alternata described but this term is not widely adopted To further standardise the taxonomic terms used the trinomial system introduced by Rotem 1994 8 is favoured When differences in host affinity are observed within the isolates of one species the third epithet the forma specialis defines the affinity to this specific host in accordance with the produced toxin causing this affinity When different toxins are produced on the same host but these toxins affect different host species the term pathotype should be used in addition All isolates which are not confined to specific hosts and or toxins should retain only the binomial name until such specificity is found 9 See also editForm zoology Forma botany Pathovar used in bacteriology Phytopathology Race biology References edit McNeill J Barrie F R Buck W R Demoulin V Greuter W Hawksworth D L Herendeen P S Knapp S Marhold K Prado J Prud homme Van Reine W F Smith G F Wiersema J H Turland N J 2012 International Code of Nomenclature for algae fungi and plants Melbourne Code adopted by the Eighteenth International Botanical Congress Melbourne Australia July 2011 Vol Regnum Vegetabile 154 A R G Gantner Verlag KG ISBN 978 3 87429 425 6 Chapter I Article 4 4 Note 4 Walker Peter M B ed 2004 1999 Biological form Chambers Dictionary of Science and Technology Edinburgh New Delhi Chambers Harrap Allied Chambers Previously The Wordsworth Dictionary of Science and Technology W R Chambers Cambridge U Pr 1998 Walker Peter M B ed 2004 1999 Biological race Chambers Dictionary of Science and Technology Edinburgh New Delhi Chambers Harrap Allied Chambers Previously The Wordsworth Dictionary of Science and Technology W R Chambers Cambridge U Pr 1998 Cohen R Burger Y Katzir N 2004 Monitoring Physiological races of Podosphaera xanthii syn Sphaerotheca fuliginea the Causal Agent of Powdery Mildew in Curcubits Factors Affecting Race Identification and the Importance for Research and Commerce Phythoparasitica 32 2 174 183 doi 10 1007 bf02979784 S2CID 27174422 Hagborg W A F 1942 Classification revision in Xanthomonas translucens Canadian Journal of Research 20c 5 312 326 doi 10 1139 cjr42c 028 Nishimura S Kohmoto K 1983 Host Specific Toxins and Chemical Structures from Alternaria Species Annual Review of Phytopathology 21 1 87 116 doi 10 1146 annurev py 21 090183 000511 PMID 25946338 Nishimura Syoyo 1980 Host Specific Toxins from Alternaria alternata Problems and Prospects Proceedings of the Japan Academy Series B 56 6 362 366 Bibcode 1980PJAB 56 362N doi 10 2183 pjab 56 362 Rotem J 1994 The GenusAlternaria Biology Epidemiology and Pathogenicity as cited by Woudenberg et al 2015 APS Press American Phytopathological Society ISBN 9780890541524 Woudenberg J H C Seidl M F Groenewald J Z de Vries M Stielow J B Thomma B P H J Crous P W 2015 Alternaria section Alternaria Species formae speciales or pathotypes Studies in Mycology 82 1 21 doi 10 1016 j simyco 2015 07 001 PMC 4774270 PMID 26951037 Retrieved from https en wikipedia org w index php title Forma specialis amp oldid 1110862021, wikipedia, wiki, book, books, library,

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