LI Cheng-Qi, WANG Qing-Lian, DONG Na, FU Yuan-Zhi, ZHANG Jin-Bao, LIAN Xiao-Dong
Cotton Science. 2010, 22(5): 415-421.
The major gene-poly gene mixed inheritance model was used to analyze the genetics of main plant architecture traits by using six generations of upland cotton variety Baimian 1(P1) and genetic standard line TM-1 (P2), and their F1, B1, B2 and F2. The results showed that optimum genetic models of plant height, fruit branch length, ratio of plant height to fruit branch length, stem internodes length, fruit branch internodes length, fruit nodes, fruit branches, effective fruit branches and fruit branch angle were D-4, C-0, D-4, D-2, E-0, D-2, B-1, B-1and C-0, respectively. The major genes of all traits were always detected except fruit branch length and fruit branch angle. Understanding the major gene-poly gene genetic rule of plant architecture traits, we would choose the appropriate means to enhance breeding efficiency. Single cross recombination or simple backcross should be adopted to transfer positive major genes for the traits including fruit branches, effective fruit branches and fruit branch internodes length, which belonged to typical major gene inheritance or mainly controlled by major gene; polymerization backcross or recurrent selection should be adopted to cumulate positive polygenes for the traits including plant height, ratio of plant height to fruit branch length, stem internodes length, fruit branch length and fruit branch angle, which belonged to typical polygene inheritance or were mainly controlled by polygene; the relative effects of major genes and polygenes should be considered separately to improve favorable major genes and polygenes simultaneously for fruit nodes controlled by major gene and polygene altogether. Our studies might provide some theoretical references on improving cotton yield through plant architecture breeding.
