Goatgrasses
Aegilops geniculata
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Pooideae
Supertribe: Triticodae
Tribe: Triticeae
Genus: Aegilops
L.
Type species
Aegilops triuncialis
Synonyms[2][3]
  • Triticum sect. Aegilops (L.) Godr. & Gren.
  • Triticum subg. Aegilops (L.) C. Yen & J.L. Yang
  • Triticum subg. Aegilops (L.) Schmalh.
  • Amblyopyrum Eig
  • Aegilemma Á.Löve
  • Aegilonearum Á.Löve
  • Aegilopodes Á.Löve
  • Chennapyrum Á.Löve
  • Comopyrum (Jaub. & Spach) Á.Löve
  • Cylindropyrum (Jaub. & Spach) Á.Löve
  • Gastropyrum (Jaub. & Spach) Á.Löve
  • Kiharapyrum Á.Löve
  • Orrhopygium Á.Löve
  • Patropyrum Á.Löve
  • Perlaria Heist. ex Fabr.
  • Sitopsis (Jaub. & Spach) Á.Löve

Aegilops is a genus of Eurasian and North American plants in the grass family, Poaceae.[4][5][6] They are known generally as goatgrasses.[7] Some species are known as invasive weeds in parts of North America.[8][9][10]

Description

These are annual plants, sometimes from rhizomes. The taller species reach about 80 centimeters in maximum height. The flat leaves are linear to narrowly lance-shaped, and are up to 15 centimeters long and one wide. The inflorescence is a spike with 2 to 12 solitary spikelets each up to 1.2 centimeters long. Some spikelets have one or three awns, and some have none.[8][11][12][13]

Wheat

Genus Aegilops has played an important role in the taxonomy of wheat. The familiar common wheat (Triticum aestivum) arose when cultivated emmer wheat hybridized with Aegilops tauschii about 8,000 years ago.[14][15] Aegilops and Triticum are genetically similar, as evidenced by their ability to hybridize, and by the presence of Aegilops in the evolutionary heritage of many Triticum taxa.[12] Aegilops is sometimes treated within Triticum. They are maintained as separate genera by most authorities because of their ecological characteristics,[12] and because when united they do not form a monophyletic group (the lowest common class will need to include some other genera).[15][16]

Ecology

Some Aegilops are known as weeds. A. cylindrica, which is commonly known as jointed goatgrass, infests wheat fields, where it outcompetes wheat plants, reducing yields. Its seeds mix with wheat grains at harvest, lowering the quality of the crop. It can also harbor pests such as the Russian wheat aphid (Diuraphis noxia) and pathogenic fungi. Other Aegilops are weeds of rangeland and wildland habitat.[17]

Prehistoric use as a wild food source

During the Mesolithic era, nomadic peoples found goatgrasses (Aegilops) growing wild, along with wild wheats and barleys, and harvested them using bone sickles inset with sharp flakes of flint. The harvested plants were left to dry for a few days, then the edible grains were separated out from the rest of the plant material by beating the plants with a wooden flail, or by rolling them against a hard surface. The seeds were then carefully singed in the embers of a fire to burn away the remaining non-edible plant material. Some grains were accidentally burnt, and since the charred grains do not biodegrade some have been found by modern archeologists.[18]

Etymology

The genus name Aegilops comes from the Greek aegilos, which could mean "a goat", "goatlike", "a herb liked by goats", or perhaps "a grass similar to that liked by goats".[8] The word "Aegilops" is claimed to be the longest word in the English language to have all of its letters in alphabetical order, and with no letters repeated.[19]

Species

Aegilops tauschii
Accepted species[7][20][8][11][12]
Formerly included species

Species once regarded as members of Aegilops but now considered better suited to other genera: Ctenium, Dactyloctenium, Elymus, Eremochloa, Ophiuros, Parapholis, Rottboellia, and Triticum

See also

References

  1. ↑ lectotype designated by Hammer, Feddes Repert. 91: 225-228 (1980)
  2. 1 2 Tropicos, Aegilops L.
  3. ↑ "World Checklist of Selected Plant Families: Royal Botanic Gardens, Kew". kew.org.
  4. ↑ Linnaeus, Carl von 1753. Species Plantarum 2: 1050-1051 in Latin
  5. ↑ "Genere Aegilops - Flora Italiana". altervista.org.
  6. ↑ Flora of China Vol. 22 Page 444 山羊草属 shan yang cao shu Aegilops Linnaeus, Sp. Pl. 2: 1050. 1753.
  7. 1 2 Aegilops. Integrated Taxonomic Information System (ITIS).
  8. 1 2 3 4 Watson, L. and M. J. Dallwitz. 1992 onwards. Aegilops. Archived October 10, 2008, at the Wayback Machine The Grass Genera of the World. Version: 18 December 2012.
  9. ↑ "Aegilops". County-level distribution maps from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  10. ↑ Aegilops classification systems. Archived 2013-10-22 at the Wayback Machine Wheat Genetic and Genomics Resource Center. Kansas State University.
  11. 1 2 Aegilops. The Jepson eFlora 2013.
  12. 1 2 3 4 Aegilops. Archived October 22, 2013, at the Wayback Machine Triticeae Genus Fact Sheets. Intermountain Herbarium. Utah State University.
  13. ↑ Aegilops. GrassBase. Royal Botanic Gardens, Kew. Version 16 November 2012.
  14. ↑ Jia, J., et al. (2013). Aegilops tauschii draft genome sequence reveals a gene repertoire for wheat adaptation. Nature 496, 91–95.
  15. 1 2 Petersen, G., et al. (2006). Phylogenetic relationships of Triticum and Aegilops and evidence for the origin of the A, B, and D genomes of common wheat (Triticum aestivum). Molecular Phylogenetics and Evolution 39(1), 70–82.
  16. ↑ Yamane, K. and T. Kawahara. (2005). Intra- and interspecific phylogenetic relationships among diploid Triticum-Aegilops species (Poaceae) based on base-pair substitutions, indels, and microsatellites in chloroplast noncoding sequences. American Journal of Botany 92(11), 1887-98.
  17. ↑ Aegilops. Encycloweedia Data Sheets. California Department of Food and Agriculture (CDFA).
  18. ↑ Thomson, Peter (2010). Seeds, sex, and civilization: How the hidden life of plants has shaped our world. Thames and Hudson. 12,13.
  19. ↑ "Real Facts | Snapple". Snapple. Retrieved 2018-06-23.
  20. ↑ Aegilops. The Plant List.
  21. ↑ "RBG Kew: GrassBase - Aegilops biuncialis Description". kew.org.
  22. ↑ "Taxonomy - GRIN-Global Web v 1.9.8.2".

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