Studies of Karyotypes in Three Wild and Four Cultivated Species of Gossypium

Karyotypes in seven species of Gossypium, G. thurberi, G. advidsonii, G. raimondii of D group; G. herbaceum, G. arboreum of A group; G. hirsutum and G. ba- rbadense of AD group were studied in 1983. It can be simplified as follows: G. thurberi 2n = 2x = 26 = 24m + 2Sm (2SAT); G. davidsonii 2n= 2x = 26 20m+6Sm(4SAT); G. raimondii 2n=2x= 26= 20m+6Sm(2SAT); G. herbaceum 2n = 2x = 26 = 18m + 4Sm+4St(4SAT); G. arboreum 2n = 2x = 26 = 18m + 6Sm (2SAT) + 2St(2SAT); G. hirsutum 2n = 4x =52 = 32m + 18Sm(4SAT) +2St (2 SAT); G. barbadense 2n = 4x = 52 = 38m + 12Sm (2SAT) + 2St(2SAT). This paper also deals with the supplier in A group and D group of tetraploids.