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应用植物数量性状主基因+多基因混合遗传模型多世代联合分析方法,研究耐低钾玉米自交系90-21-3(P1)和低钾敏感玉米自交系D937(P2)及其杂交和回交世代F1、F2、B1、B2等6个世代苗期总根长的遗传机制。结果表明,总根长受加性-显性-上位性多基因控制,在B1世代选择效率最高;对于B1、B2和F2世代,其多基因遗传率分别为70.14%、42.59%和46.48%;遗传变异占表型变异平均为53.07%,环境变异占表型变异平均为46.93%。环境对植物总根长有一定影响。
A multi-generational combination analysis method was used to study the effects of 90-21-3 (P1) and D937 (P2) resistant low-K maize inbred lines and their hybridization Backcross generation F1, F2, B1, B2 and other 6 generations of seedling total root length genetic mechanism. The results showed that the total root length was controlled by the additive - dominance - epistatic polygene and the highest selection efficiency was obtained in the B1 generation. The polygene heritabilities for the B1, B2 and F2 generations were 70.14%, 42.59% and 46.48%, respectively. Genetic variation accounted for an average of 53.07% of phenotypic variation, environmental variation accounted for an average of 46.93% of phenotypic variation. The environment has a certain impact on the total plant root length.