PJB-1976-3
Investigations into the causes of unproductivity of old world and new world cotton hybrids-2 ( gossypium arboretum) X gossypium hirusutum and 2 ( gossypium arborem) X G. barbadense
Anwar malik
Abstract
Tetraploids of G. arboretum synthesized by colchicine treatment were successfully utilized in crossing with G. hirsutum and G. barbadense. These tetraploids had low pollen fertility 53.8% but gigantic morphologically. Hybrids with constitution (C-4x G. arboretum ) X G . hirsutum and (C-4x G. arboretum X G. barbadense) were obtained successfully and studied cytologically. The backcross studies were under taken but failure in this regard is due to some mechanical and genetic obstacles. The frequency of chromosomes association at the metaphysics-1 was 13, 41 I + 18.55 II and
0.5 III and 14.2 I + 18.1 II and 0.55 III
respectively..
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