不同地区黄瓜霜霉病菌毒力的差异

Study on Virulence Differences of Cucumber Downy Mildew in Different Areas

为选择黄瓜抗性品种,对来自全国8个省市18个黄瓜霜霉病菌株的孢子囊长度和宽度进行研究,以期明确定黄瓜霜霉病在各地区间的差异。结果表明:18个黄瓜霜霉病菌株的孢子囊存在差异,来自同一城市的菌株间差异不显著,并从供试的10个黄瓜品种中筛选出7个对不同致病菌株反应型各异,抗病感病界限明显的品种,可初步作为黄瓜霜霉病菌生理小种分化的鉴别寄主,利用所筛选出的鉴别寄主将18个菌株分为12个致病性类型。

For the selection of resistant cucumber varieties, studied the length and width of sporangia from all eight provinces of the 18 strains of cucumber downy mildew, in order to determine the differences of cucumber downy mildew between regions. The results showed that 18 strains of cucumber downy mildew sporangia had differences, between strains from the same city was no significant difference, and from the 10 tested cucumber cultivars were screened out seven cultivars of reactive different and resistant and susceptible disease to different pathogenic strains, but preliminary screening for cucumber downy mildew physiological small differential host differentiation, by using differential host will 18 strains was divided into 12 pathogenic types.