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自1983年起,比较系统地对稻瘟病菌生理小种时、空间分布及变化规律进行观察。在时间上,主要对早稻病菌田间小种消长规律进行观察;在空间上,主要对山区各不同海拔的小种分布进行观察。通过对350个单孢菌株的测定.认为生理小种优势种群与优势小种在该病流行期基本保持稳定,优势小种组成与品种栽培面积及不同海拔品种布局有关;田间小种变化速率与气候条件有关。高山区引进品种抗性丧失快的主要原因是气候因子。
Since 1983, more systematically to the physiological races of Magnaporthe grisea, the spatial distribution and changes were observed. In time, we mainly observe the growth and decay of races in the field of early rice pathogens. In space, we mainly observe the distribution of races at different altitudes in mountainous areas. Through the determination of 350 monospore strains, the dominant races and dominant races of ramet were basically stable during the epidemic phase, and the races of dominant races were related to the cultivated area of cultivars and the distribution of cultivars at different altitudes. The rate of change of races Climatic conditions. The main reason for the rapid loss of resistance in introduced varieties in high mountain areas is the climatic factor.