Abstract: Two japonica rice landraces Baodao and Heikezijing from the rice-growing area of Taihu Lake in China, which were highly resistant to the various Chinese races of rice blast (Pyricularia grisea), were crossed with the susceptible Lijiang Xintuanheigu without any resistance genes to known races of the pathogen to produce hybrid progenies. The seedlingplants of parents, F₁, F₂, BC₁ and selected F₃ derived lines in the F₂ were inoculated with the mostly prevalent race ZG1 andvirulent race ZA49 respectively in the greenhouse to determine the inheritance of resistance to blast in two landraces. The results indicated that the resistance of the Baodao and Heikezijing to races ZG1 and ZA49 were dominant and monogenic and nonallelic each other. It was found that the two resistance genes in the landraces were independent with the three known loci Pi-k^m, Pi-ta and Pi-b in the near isogenic lines.

Key words: genetic analysis, inheritance, Pyricularia grisea, resistance

摘要： 将两个太湖流域粳稻地方品种薄稻和黑壳子粳分别与感病品种丽江新团黑谷杂交和回交，获得F₁、F₂、BC₁世代和部分F₃家系，在3～4叶期用喷雾法分别接种ZA49和ZG1小种，根据抗、感分离比例，推断薄稻和黑壳子粳对ZG1和ZA49的抗性均由一对显性主效基因控制，两个抗病品种的抗病基因间呈非等位关系。进一步将两个抗病品种与三个含已知抗病基因的近等基因系材料F-98-7（Pi-k^m）、F-124-1(Pi-ta)和F1452(Pi-b)杂交，根据F₁和F₂接种结果表明，两个粳稻地方品种与上述三个材料所携带的抗病基因是不等位的。

关键词: 遗传分析, 遗传, 稻瘟病