Combining Ability and Heterosis for Yield and Fiber Quality Properties in Cotton (G. hirsutum L.) obtained by Half Diallel Mating Design
AbstractThe objective of this study was to investigate the general combining ability (GCA) of parents and specific combining ability (SCA) of hybrids and also the genetic behavior for studied characteristics in the population obtained by 7x7 half diallel quantitative analysis method involving four MAR (Multi Adversity Resistance) and three commercial cotton (Gossypium hirsutum L.) varieties. The twenty one F1 and seven parents were planted as a randomized complete block design with four replications in 2004. The general combining ability (GCA) variance effects of the parents and the specific combining ability (SCA) variance effects of the hybrids and the gene effects were estimated by using the half diallel analysis method 2, model 1, described by Griffing. In the populations ginning percentage, fiber length, fiber fineness and fiber elongation properties were influenced by additive; seed cotton yield, fiber strength and fiber uniformity ratio were influenced by non-additive gene effects. Significant and positive heterosis values were observed except in fiber uniformity for seed cotton yield, fiber strength, fiber fineness, fiber elongation and ginning percentage respectively. It was determined that â€˜Sayar 314â€™ for seed cotton yield and fiber length, â€˜Tamcot CD3Hâ€™ for fiber uniformity ratio, â€˜Tamcot Sphinxâ€™ for fiber strength, â€˜Tamcot Luxorâ€™ for ginning percentage and fiber elongation, â€˜Tamcot HQ95â€™ for fiber fineness were the best parent cotton cultivars and also having the best (GCA) general combining abilities. It was also determined that â€˜MaraÅŸ 92â€™ x â€˜Tamcot HQ95â€™ for fiber fineness, â€˜Stoneville 453â€™ x â€˜Tamcot Sphinxâ€™ for seed cotton yield, â€˜Tamcot HQ95â€™ x â€˜Tamcot Sphinxâ€™ for ginning percentage and fiber elongation, â€˜MaraÅŸ 92â€™ x â€˜Sayar 314â€™ for fiber length, â€˜MaraÅŸ 92â€™ x â€˜Tamcot HQ95â€™ and â€˜Tamcot CD3Hâ€™ x â€˜Tamcot Sphinxâ€™ for fiber strength, â€˜Sayar 314â€™ x â€˜Stoneville 453â€™ for fiber uniformity ratio hybrid combinations were the most promising crosses with the highest specific combining ability.
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