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为了明确福建省辣椒疫霉菌群体遗传结构的表型特征,对分离自福建省15个市(县)的300株辣椒疫霉菌的交配型、甲霜灵敏感性及生理小种进行了测定。结果显示,288株为A2交配型,12株为A1交配型,出现频率分别为96%和4%,以A2占优势,在各采集点均有分布。263株对甲霜灵表现敏感,28株为中间型,9株为抗性,分别占总体的87.67%、9.33%和3.00%,甲霜灵敏感菌株为主要菌系。根据菌株对辣椒疫霉菌生理小种鉴别寄主的致病性测定结果,可将辣椒疫霉菌划分为3个生理小种,其中168株为小种3,126株为小种2,6株为小种1,分别占56%、42%和2%,小种3为福建辣椒疫霉菌优势小种。
In order to clarify the phenotypic characteristics of Phytophthora capsici population in Fujian Province, the mating type, metalaxyl sensitivity and physiological races of 300 Phytophthora capsici isolated from 15 cities (counties) of Fujian Province were determined. The results showed that 288 strains of A2 mating type, 12 strains of the A1 mating type, the frequency of occurrence was 96% and 4%, with A2 dominant distribution at each collection point. 263 strains were sensitive to metalaxyl, 28 were intermediate and 9 were resistant, accounting for 87.67%, 9.33% and 3.00% respectively. Metalaxyl-sensitive strains were the major strains. According to the results of pathogenicity test on the host of P. capsici, we can divide P. capsici into three physiological races, of which 168 were races 3,126 races and 2,6 were race 1 , Accounting for 56%, 42% and 2% respectively, while race 3 was the dominant race of Phytophthora capsici in Fujian.