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1996年对北方粳稻区稻瘟病菌生理小种鉴定和毒性频率分析的结果表明 ,小种 337、 2 37、0 0 3、 137和 537为该稻区的优势小种 ,不同地区优势小种的分布及病原菌群体的遗传多样性存在明显差别。对病原菌群体进行毒力频率分析的结果发现 ,该稻区的稻瘟病菌对已知抗性基因 Pi- z、 Pi- zt、Pi- t和未知抗性基因近等基因系 F- 2 1- 6、F- 2 5- 3、F- 4 0 - 3、F- 59- 1和 F- 66- 10的毒力频率较低 ,在 2 %～ 10 %之间 ,这说明上述抗性基因和未知抗性基因抗源在水稻育种上具有较高的利用价值。同时 ,本研究比较和分析了北京、天津和丹东地区在 3个不同时期 ( 1985～ 1987年、 1990～ 1992年和 1996年 )的稻瘟病菌群体的变化情况 ,结果发现随着栽培品种的更替和时间变迁 ,各地稻瘟病菌群体结构都表现出日趋简单的趋势 ,主要小种的组成及群体毒力频率均发生了根本性变化。另外 ,本文还就栽培品种对病原菌小种分布的影响、抗病品种种植面积与毒力小种群频率的关系等问题进行了讨论
The results of the identification and virulence analysis of the races of Pyricularia grisea in northern japonica rice in 1996 showed that the races 337, 2 37, 0 0 3, 137 and 537 were the dominant races in this rice region, and the races of dominant races in different regions Distribution and genetic diversity of pathogenic bacteria there are significant differences. Virulence analysis of the pathogen population showed that M. grisea in this rice region was sensitive to Pi- z, Pi- zt, Pi- and unknown alleles F- 2 1- 6, F- 2 5- 3, F- 4 0-3, F-59-1 and F-66-10 were lower at between 2% and 10%, indicating that the above-mentioned resistance genes and The resistance source of unknown resistance gene has high utilization value in rice breeding. At the same time, this study compared and analyzed the changes of the rice blast population in three different periods (1985 ~ 1987, 1990 ~ 1992 and 1996) in Beijing, Tianjin and Dandong, and found that with the replacement of cultivars And time changes, the population structure of M. grisea showed an increasingly simple trend. The composition of major races and the frequency of virulence of the population had undergone fundamental changes. In addition, this article also discussed the cultivars on the distribution of pathogenic bacteria races, the planting area of resistant varieties and the relationship between the frequency of virulent populations and other issues were discussed