水稻千粒重遗传分离模式初探

摘要

千粒重是水稻产量的重要构成要素。选用该性状差异较大的亲本，进行杂交，得F1代，再将F1代自交获得F2代，构建P1、F1、P2和F2世代，并对这4个世代的这个性状进行考查。利用亲本、F1和 F24个世代进行数量性状主基因＋多基因混合遗传分析，选出最适模型，并对模型的遗传估计值进行分析，从而得出相关结论。经检测这2个组合的千粒重遗传分离模式均属于C-0模式，且千粒重主基因遗传率为0.86％～0.97％，多基因遗传率为68.06％～80.33％，两者合计的遗传率为68.92％～81.30％。%Thousand-grain weight (TGW ) is one of the important indicators for rice yield determination .For the study ,F1 rice crossed from parents with significant difference on TGW and its F 2 by self-crossing the F1 were used . The TGW traits of P1 ,F1 ,P2 and F2 were the basis for the evaluation .An optimal model was selected from the quantitative trait master + multi-gene mixed inheritance models .The genetic prediction by the model indicated that the TGW of the crossed rice varieties followed a C-0 mode ,and the inherant rate of the main genes was 0.86% -0.97% while that of the multiple genes 68.06% -80.33% .The combined ,overall rate for the genes to pass on from one generation to the next was 68.92% -81.30% .