Aegilops Explained

Aegilops is a genus of Eurasian and North American plants in the grass family, Poaceae.[1] [2] [3] They are known generally as goatgrasses.[4] Some species are known as invasive weeds in parts of North America.[5] [6]

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.[5] [7] [8] [9]

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.[10] [11] 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.[8] Aegilops is sometimes treated within Triticum. They are maintained as separate genera by most authorities because of their ecological characteristics,[8] and because when united they do not form a monophyletic group (the lowest common class will need to include some other genera).[11] [12]

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.[13]

Prehistoric 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.[14]

Etymology

The genus name Aegilops is botanical Latin and comes from the Ancient Greek (), which is of uncertain origin. If the word is from (, “goat”) + (, “eye; ”), it could mean "goatlike herb", "a herb liked by goats", or perhaps "a grass similar to that liked by goats".[5] On the other hand, it also referred to some species of oak, and since it resembles the Proto-Indo-European word for "oak",, this could be the source instead. In any case, it may be from the Pre-Greek substratum language.[15]

The word 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,[16] [17] but the botanical sense is obsolete in English and aegilops persists in some medical literature, where it refers to an ulcer or fistula in the corner of the eye, another meaning of the Ancient Greek word.

Species

Accepted species[4] [18] [5] [7] [8]
Formerly included speciesSpecies 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

Notes and References

  1. https://www.biodiversitylibrary.org/page/359071#page/492/mode/1up Linnaeus, Carl von 1753. Species Plantarum 2: 1050-1051
  2. Web site: Genere Aegilops - Flora Italiana. altervista.org.
  3. http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=100654 Flora of China Vol. 22 Page 444 山羊草属 shan yang cao shu Aegilops Linnaeus, Sp. Pl. 2: 1050. 1753.
  4. https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=182534 Aegilops.
  5. Watson, L. and M. J. Dallwitz. 1992 onwards. Aegilops. The Grass Genera of the World. Version: 18 December 2012.
  6. http://www.k-state.edu/wgrc/Taxonomy/taxaeg.html Aegilops classification systems.
  7. http://ucjeps.berkeley.edu/cgi-bin/get_IJM.pl?tid=10107 Aegilops.
  8. http://herbarium.usu.edu/triticeae/Genera/Aegilops.htm Aegilops.
  9. http://www.kew.org/data/grasses-db/www/gen00007.htm Aegilops.
  10. Jia, J., et al. (2013). Aegilops tauschii draft genome sequence reveals a gene repertoire for wheat adaptation. Nature 496, 91–95.
  11. 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.
  12. 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.
  13. https://archive.today/20131021091508/http://www.cdfa.ca.gov/plant/ipc/weedinfo/aegilops.htm Aegilops.
  14. Thomson, Peter (2010). Seeds, sex, and civilization: How the hidden life of plants has shaped our world. Thames and Hudson. 12,13.
  15. Book: Beekes, Robert S. P.. Robert S. P. Beekes

    . Robert S. P. Beekes. 2010. Etymological Dictionary of Greek. Leiden, Boston. Brill. Leiden Indo-European Etymological Dictionary Series. with the assistance of Lucien van Beek. 9789004174207. αἰγίλωψ, -ωπος. 32.

  16. Web site: Real Facts Snapple. Snapple. 2018-06-23.
  17. http://www.guinnessworldrecords.com/records-2000/longest-english-word-with-letters-arranged-in-alphabetical-order/ Longest English word with letters arranged in alphabetical order.
  18. http://www.theplantlist.org/browse/A/Poaceae/Aegilops/ Aegilops.
  19. Web site: RBG Kew: GrassBase - Aegilops biuncialis Description. kew.org.
  20. Web site: Taxonomy - GRIN-Global Web v 1.9.8.2.

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