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1989年我区稻瘟病大流行,发生面积73万亩,其中穗颈瘟44万亩,损失稻谷1441万公斤。本地区杂交稻63品系大面积单一化连年种植,导致病菌优势小种的变化,造成抗病性丧失,是大流行的主要原因。63品系开始引入本区时高产,抗病力强,1987年发现感病稻株,1989 年我区种植杂交稻85.8万亩,占水稻总面积的73.1%,而63品系又占杂交稻面积的92.2%。63品系的母本都属野败型同一质源。抗病性相近,给新优势种群的形成和积累创造了有利条件,据测定1989年我区致病力强的 ZB 群小种数量上升是63品系抗性丧失的最主要原因。其次是气
In 1989, there was a pan-pan blast in our district, with an area of 730,000 mu, of which 44,000 mu was panicle blast and 14.41 million kilograms of rice was lost. The 63 hybrid rice in this area has been planted in large area for successive years, leading to the change of dominant race of bacteria, resulting in the loss of disease resistance, which is the main reason for the pandemic. 63 strains introduced into this area when the high yield, strong disease resistance, found in 1987 infected rice plant in 1989, my district planted 85.8 hectares of hybrid rice, accounting for 73.1% of the total rice area, and 63 lines account for the hybrid rice area 92.2%. 63 strains of the female parent belong to the same source of wild-type. Similar resistance to disease, the formation and accumulation of new dominant species to create favorable conditions, according to the determination of the strong virulence in 1989 ZB race population is the number of 63 strains of the main reason for the loss of resistance. Followed by gas