Cotton, in the Gossypium genus, constitutes five tetraploid （2n = 4x = 52） and 45 diploid （2n = 2x = 26） species, which are believed to have originated from a common ancestor 5-10 million years ago （MYA）. Upland...Cotton, in the Gossypium genus, constitutes five tetraploid （2n = 4x = 52） and 45 diploid （2n = 2x = 26） species, which are believed to have originated from a common ancestor 5-10 million years ago （MYA）. Upland cotton （G. hirsutum, AADD, 2n = 4x = 52）, which is responsible for over 90% of the world＇s cotton lint production, is thought to have undergone an allopolyploidization event about 1-2 MYA involving both A and D genome species （Wendel and Albert 1992）. The progenitor of G. raimondii （DD, 2n = 2x = 26） is considered the contributor of the D subgenome, while ancestors of G. arboreum （AA, 2n = 2x = 26） may have contributed the A subgenome to G. hirsutum （Sunilkumar et al. 2006; Chen et al. 2007）.展开更多
文摘Cotton, in the Gossypium genus, constitutes five tetraploid （2n = 4x = 52） and 45 diploid （2n = 2x = 26） species, which are believed to have originated from a common ancestor 5-10 million years ago （MYA）. Upland cotton （G. hirsutum, AADD, 2n = 4x = 52）, which is responsible for over 90% of the world＇s cotton lint production, is thought to have undergone an allopolyploidization event about 1-2 MYA involving both A and D genome species （Wendel and Albert 1992）. The progenitor of G. raimondii （DD, 2n = 2x = 26） is considered the contributor of the D subgenome, while ancestors of G. arboreum （AA, 2n = 2x = 26） may have contributed the A subgenome to G. hirsutum （Sunilkumar et al. 2006; Chen et al. 2007）.
