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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.
Cotton, in the Gossypium genus, then 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 with 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 an act of G, arboreum (AA, 2n = 2x = 26) may have contributed the A subgenome to G.