水稻主基因-多基因混合遗传控制白叶枯病抗性的基因效应分析

利用主基因－多基因混合遗传模型分析了５个抗感交组合对水稻白叶枯病菌抗性的基因效应，结果表明５个组合中的３个主基因抗性遗传符合德尔分离比的前提下存在多基因抗性，而且这３个组合彼此间抗病基因的加性效应，主基因和多基因遗传方差及其遗传率存在变异。说明水稻白叶枯病抗性虽以主基因作用为主，但考虑到抗性的持久性，建议在水稻白叶枯病育种中构建主基因－多基因混合遗传体系，以有效抑制白枯病菌群体中小种的波动。

Major-Polygene Effect Analysis of Resistance to Bacterial Blight (Xanthomonas campestris pv.oryzae) in Rice

five crosses between resistance and susceptible were analyzed to study major-polygene effect using major-polygene mixed mode. The result showed that 3 of 5 crosses were controlled by both major gene and polygene. In addition, there were large variation of additive effect, variance as well as heredity of major gene polygene in 3 crosses. Major gene was predominant in resistant variation, but durability should be considered. We suggested that construct major-polygene system be constructed in the long run in breeding program to ensure a durable and high level of resistance to constrain fluctuation of races of Xanthomonas campestris pv. oryzae population.