摘要： 以8种不同胞质类型的不育系及其保持系与9个恢复系配制的72个不育系杂种及保持系杂种为材料，研究了杂交稻对白叶枯病菌主基因抗性的配合力。结果表明，杂交稻的抗性以主基因抗性为主，但同时也受双亲中与抗性有关的其他加性、显性及上位性基因效应的影响。说明杂交稻的抗性强弱取决于双亲抗性基因互补和累加程度高低。

关键词: 杂交稻, 白叶枯病, 配合力, 基因效应

Abstract: Eight different cytoplasmic male sterile lines and their corresponding maintainer lines were crossed respectively with nine restorer lines harbouring dominant R-genes Xa-3, Xa-4, Xa-7and Xa-21 with P×Q mating design. Seventy-two male sterile line hybrids and maintainer line hybrids were inoculated with strong and weak virulent XOO isolates ZHE-173 and KS-6-6 for purpose of probing into variant factor of resistance to bacterial blight in hybrid rice. The result showed that major gene resistance was predominant in hybrid rice, but resistance of hybrid rice was modified by other genes with additive, dominant and epistatic effect. This indicated that resistance of hybrid rice depended on the complement and pyramid of resistant genes.

Key words: Hybrid rice, Bacterial blight, Combining ability analysis of maior gene resistance