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利用高抗品种东农 96 74与感病品种杂交 ,在田间多个生理小种共存条件下研究大豆灰斑病抗性的遗传规律 ,发现杂交后代的抗性表现具有明显的质量性状遗传特征 ,F1 代表现完全显性 ,F2 代的抗感分离比例在个别组合接近 3∶1。采用数量性状的主要基因 -多基因混合遗传模型对抗性的遗传进行模型的判别与遗传参数的估计 ,发现抗性遗传存在明显的主基因效应 ,分别符合一个主基因 +多基因加显性模型及两个主基因独立遗传模型。主基因的加性、显性以及主基因之间的相互作用普遍存在 ,对抗病性的遗传起很大作用。
The genetic rule of resistance to soybean gray leaf spot was studied under the coexistence of multiple physiological races in the field by crossing the high resistant variety Dongnong 96 74 with susceptible varieties. It was found that the resistance performance of hybrid progeny had obvious genetic traits of quality traits, The F1 generation is now completely dominant, and the F2 generation is nearly 3: 1 in individual combinations. Multiple gene mixed inheritance model, which is the major gene of quantitative traits, was used to discriminate the genetic model of resistance and to estimate the genetic parameters. It was found that there was a significant main gene effect in resistance inheritance, which was consistent with a dominant gene + polygene plus dominant model and Two major genes independent genetic model. The major genes are additive and dominant as well as the interactions between the major genes are prevalent and play a significant role in the inheritance of disease resistance.