Cytomorphological studies in hybrid between haploid of Gossypium hirsutum (L~) and diploid Gossypium arboreum (L.)

Abstract

A hybrid between G. hirsutum haploid (2n = 2x = 26; AhDh) and G. arboreum L. Var. G 27 (2n = 2x = 26; A1A1) was obtained. Its hybridity was confirmed on morphological and cytological basis. This hybrid is considered as a successful breakthrough in gene transfer between G. hirsutum x G. arboreum which was earlier considered as difficult and unsuccessful due to incompatibility caused by the disintegration of endosperm and failure of embryo development as well as disharmony between zygote and surrounding tissue (endosperm zygote imbalance). Restoration of such balance in haploid might make it possible for hybrid embryo to develop into normal healthy seed and adult plant. Further, utilization of this hybrid for introgression of resistance to sucking pests, drought as well as wider adaptability from G. arboreum to G. hirsutum is discussed.