以三元杂种〔(亚洲棉×比克氏棉 )×陆地棉〕和〔陆地棉× (亚洲棉×比克氏棉 )〕为母本 ,以陆地棉为轮回亲本进行回交 ,陆地棉花粉在三元杂种柱头上能顺利萌发 ,花粉管在花柱组织中生长并进入了胚珠到达胚囊 ,只是比陆地棉自交生长缓慢 ,受精百分率低 ,精核能进入卵核 ,但胚乳游离核分裂不正常 ,导致胚及胚乳解体 ,最后发生败育 The ternary hybrids [(Asiatic cotton x Beech cotton) × Upland cotton〕 and [Upland cotton × (Asiatic cotton × Beech cotton)〕 as the female parent to Upland cotton as the recurrent parent backcross, cotton The pollen tube grew well in the style and entered the embryo sac. The pollen tube grew slowly in inbreds, but the percentage of fertilization was low. The sperm nucleus could enter the egg nucleus, but the free endosperm nucleus was not normal , Resulting in the disintegration of embryos and endosperm, abortion eventually occurred