玉米对小斑病T小种抗性的遗传模型分析

Genetic Model Analysis of the Resistance in Maize to Helminthosporium maydis Race T

用广义遗传模型方法 ,研究了玉米对小斑病T小种的抗性遗传特性。结果表明 :玉米对小斑病T小种的核抗性主要受加性和显性效应控制 ,以显性效应为主。 3个病害指标之间有极显著的正相关 ,相关性主要归因于加性效应 ,病斑数和病级之间还有显著的显性遗传相关。另外 。

Genetic studies were conducted for the resistance in maize to Helminthosporium maydis race T,using the generalized genetic model method.The results indicated that additive and dominance effects,with the dominance effect predominating mainly controlled the nuclear resistance.Positive correlations among the three disease traits were highly significant,which were mainly ascribed to additive effects.Dominant genetic correlation between lesion number and disease rating was also significant.The potential values of parental lines were evaluated in respect to the predicted values of genetic effects.