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根据玉米育种和生产实践,筛选13个塘四平头改良系(P1),15个非塘四平头自交系(P2)。采用NCⅡ遗传交配设计,组配不完全双列杂交组合,田间调查性状并室内考种。研究结果表明,各性状配合力在P1、P2组内不同自交系间存在差异,P1和P2内遗传变异丰富,类群间杂种优势明显。P1、P2的主要产量性状和稳产性相关性状GCA表现良好,GCA方差与SCA比值均大于1,11个性状的加性方差均大于非加性方差,说明11个性状在P1、P2的组合间以加性效应为主。试验证明,P1、P2具有较好的轮回选择及组配优势组合的遗传潜势,通过群体轮回选择聚合微效基因以改良主要性状表现型切实可行。
According to the practice of maize breeding and production, 13 ponds Siping plan improvement series (P1) and 15 non-pond Siping planted inbred lines (P2) were screened. Using NCⅡ genetic mating design, the combination of incomplete diallel cross combinations, field investigation traits and indoor test species. The results showed that the combining ability of all traits was different among different inbred lines in P1 and P2 groups, and the genetic variations in P1 and P2 were abundant, and the heterosis among the groups was obvious. The major yield traits and the stability-related traits of P1 and P2 showed good GCA, the GCA variance and SCA ratio were greater than 1, 11 additive traits of variance were greater than the non-additive variance, indicating that 11 traits in the combination of P1 and P2 Addition-based effects. The experiment proves that P1 and P2 have better genetic selection for cycle selection and combination with dominant combination. It is feasible to improve the performance of main traits phenotypic by means of population round robin polymerization.