黑龙江省稻瘟病菌对主栽水稻品种的致病力分析

Pathogenicity Analysis of Rice Balst on Some Major Rice Cultivars in Heilongjiang Province

采用幼苗期接种及毒力频率、致病率分析方法,检测来自黑龙江省20个县(市、区)的90个稻瘟病菌株对当地主栽水稻品种的致病能力。结果表明,黑龙江省稻瘟病菌群体结构是比较复杂的,不同菌株的致病力存在较大差异,但仅有10%菌株表现强或较强致病力(PF≥50%);不同地区、甚至同一地区的不同菌株致病力也有较大差异。各主栽水稻品种的抗病能力存在显著差异,其中龙粳41等14个品种抗性较强(VF≤15%)。

The pathogenicity of 90 rice blast strains collected from Heilongjiang province was compared by using two reliable methods of toxicity frequency and pathogenicity method. The results showed that the rice blast fungus population structure of Heilongjiang was very complex,there was the big difference in these strains,but only 10% of these strains showed strong virulence（ PF ≥50%）. In addition,the significant difference of pathogenicity of these strains could also be observed in different regions or even in one region. The significant difference of disease resistance could also be observed among these major rice varieties,especially in Longjing 41 and other 14 rice varieties（ VF≤15%）.