Forty-six Cytospora chrysosperma strains isolated from 31 cities or counties of 11 provinces in China were analyzed for their pathogenicity and genetic diversity.The results showed that there was no significant relationship between the geographical origin and the pathogenicity,but there was a certain relationship between pathogenicity and the host species.The strains isolated from Popular showed stronger pathogenicity than that from non-poplar hosts.The RAPD analysis of genetic diversity divided the C.chrysosperma strains into two groups.The first group included all strains of Beijing,Xinjiang,Liaoning,Shaanxi,Jilin,Qinghai,Gansu and 5 strains of Heilongjiang,2 strains of Shandong,1 strain of Inner Mongolia.The second group included all strains of Sichuan,7 strains of Inner Mongolia and 1 strains of Shandong.The cluster analysis of genetic diversity further divided the strains of the first group into the geographic groups of Beijing,Xinjiang,Liaoning,as well as the Gansu and Qinghai mixed group,the Heilongjiang,Jilin,Qinghai,Shaanxi,and Gansu mixed group.The strains of the second group were divided into the geographic groups of Inner Mongolia and Sichuan.The study indicated that there was an obvious relationship between the the geographical origin and the genetic diversity grouping.%对来源于国内11省(区)31市(县)的46株金黄壳囊孢菌进行致病性和遗传多样性聚类分析.结果表明:金黄壳囊孢菌的致病性与地理来源无明显关系而与寄主种类有一定的关系,从杨树上分离菌株的致病性强于非杨树上分离的菌株.RAPD分析表明:所有来源的46个菌株可分为2大类群,第1类群包括北京、新疆、辽宁、陕西、吉林、青海、甘肃的全部菌株和黑龙江5个菌株、山东2个菌株、内蒙古1个菌株,第2类群包括四川的全部菌株、内蒙古7个菌株和山东1个菌株.第1类群又可分为北京类群、新疆类群、辽宁类群、甘肃青海混合类群和黑吉青陕甘混合类群5个类群,第2类群可分为内蒙古类群和四川类群2个类群.金黄壳囊孢菌遗传多样性分组与菌株的地理来源呈较明显的相关性.
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