Utilization of Cotton Haploids in Basic and Applied Research
Oct 8, 2018

Biotechnology WCRC WCRC2

ABSTRACT
Systematic cytological work in the genus Gossypium L. resulted in isolation of haploids (2n=2x=26) in tetraploid (2n=4x=26) G. hirsutum, G. barbadense and their F2 interspecific crosses and monoploid (n=x=13) cultivated Asiatic (2n=2x=26) cotton. The haploids and monoploids were studied for differences in their morphological characters at haploid and diploid levels. On the basis of cytological observation in haploids and monoploids, a new concept of the basic chromosome number (x=7) in the genus and the polyploid nature of Gossypium spp. (2n=2x=26) is proposed. The haploids were found to be a shorter and easier means for securing desirable interspecific genetic combinations. Most interspecific hybridization reported in Gossypium so far are at the tetraploid and diploid levels. The success in transfer of characters in such crosses is limited by sterility in F1s. Development of fixed lines from these interspecific gene transfer becomes a long-term program with a low success probability. The use of G. hirsutum haploids (2n=2x=26), AhDh, for hybridization with different wild Gossypium species is a new and shorter approach in this regard


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