水稻品种系对稻瘟病菌生理小种抗性谱测定的研究

每年选用天津市有代表性的7群11～15个稻瘟生理小种,先后对768个品种(系)进行抗谱测定,抗菌率达80～100％有34个品种(系),占供试品种(系)4.4％,抗菌率在60～79％属中等抗病的品种(系)有109个,占14.2％,其余625个品种(系)属感病类型。另外用7群10个小种对抗菌力较高的74个品种(系)进行抗病类型划分,抗菌率在90％有4个类型,抗菌率在80％有3个类型。根据各地优势小种分布选择抗源和供生产上品种轮换种植的参考。以上结果说明抗谱测定是相对稳定的,对生产与育种有实用价值。

A Study on the Determination of the Resistance Spectrum for Rice Varieties (Strains) to Physiological Races of Piricularia aryzae

From 1986 to 1990, typical physiological races from 7 localgroups were chosen, and the resistance spectrums for 768 rice varieties (strains) were determined. The resistance percentage of 34 varieties, constituting 4.4% of the total, was up to 80-100%, while that of 109 moderate resistance varieties, constituting 14.2% of the total was up to 60-79%. The other 625 varieties were susceptible. Moreover, 74 high resistance varieties were tested and divided by 10 races from the 7 groups. There were 4 types with resistance percentage up to 90%, and 3 types with resistance percentage up to 80%. According to the distribution of the dominant physiological races in different areas, resistant varieties were selected to facilitate variety rotation. The above results showed that the spectrum of resistance was relatively stable and had a practical value to production and breeding.