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以高感根肿病的青花菜自交系‘93219’和高抗根肿病的甘蓝近缘野生种(Brassica macrocarpa Guss.)自交系‘B2013’为亲本配制的6个联合世代(P1、P2、F1、BC1、BC2和F2)群体为试材,采用主基因+多基因混合遗传模型对根肿病抗性进行了遗传分析。结果表明:青花菜×甘蓝近缘野生种‘B2013’后代对根肿病抗性的最适遗传模型为B-1模型,即由两对加性―显性―上位性主基因控制。BC1、BC2和F2世代主基因遗传率分别为81.22%、78.36%和80.00%,遗传变异平均值占表型变异的79.86%,环境变异平均值占表型变异的20.14%,表明抗病性以主基因遗传为主,同时受环境影响较大,应在早期世代进行选择,BC1、F2世代主基因选择效率较高。
Six combination generations (P1, P2, P4) of broccoli inbred line ’93219’ highly susceptible to clubroot disease and inbred line ’B2013’ of Brassica macrocarpa Guss. F1, BC1, BC2 and F2) populations were used as experimental materials to analyze the genetic susceptibility to clubroot disease using the mixed major and polygenetic model. The results showed that the best genetic model for clubroot disease resistance of ’B2013’ wild relatives of Broccoli × cabbage was B-1 model, which was controlled by two pairs of additive-dominance-epistatic major genes. The heritabilities of the major genes of BC1, BC2 and F2 were 81.22%, 78.36% and 80.00% respectively, the average of genetic variation accounted for 79.86% of the total phenotypic variation, and the average of environmental variation accounted for 20.14% of the total phenotypic variation, indicating that the disease resistance The main gene is inherited mainly and influenced by the environment at the same time. It should be selected in the early generation, and the main gene selection efficiency in BC1 and F2 generations is higher.