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. 2015 Sep 30;5:14139. doi: 10.1038/srep14139

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Copyright © 2015, Macmillan Publishers Limited

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Allotetraploid cotton evolved from the natural hybridization between A- and D-genome species and has split into six species, including the widely cultivated G. barbadense (AD₂) and G. hirsutum (AD₁). Evolutionary time (in Mya) is indicated by a numbered axis; major evolutionary events are represented by arrows and concluded in boxes. A black star indicates a retrotransposon burst, and a red star indicates a boom in pseudogene production. Gr, G. raimondii, a diploid species (D₅); Gb, G. barbadense; Gh, G. hirsutum. Mature cotton fiber is shown for extra-long stable (ELS) cotton (G. barbadense, AD₂) and Upland cotton (G. hirsutum, AD₁).