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杨生褐盘二孢菌（Marssoninabrunnea）是引起我国杨树黑斑病的最主要病原。病原菌的形态学和致病性分析已经证明这个种有分化现象。本研究从我国不同地区不同寄主上收集了42个杨生褐盘二孢菌菌株，用随机扩增多态性DNA（RAPD）研究了它们之间的遗传多样性。聚类分析根据80％的相似性把42个菌株分成3个组（A、B和AB组）。A组中包含有4个分离自毛白杨的菌株；B组中含37个自青杨派和黑杨派分离的菌株；AB组中仅含有1个分离自响叶杨的菌株。推断AB组菌株可能是A组菌株向B组菌株进化的一个过渡类型。
Marssoninabrunnea is the most important causative agent of poplar black spot disease in China. Morphological and pathogenicity analysis of pathogenic bacteria has demonstrated the divergence of this species. In this study, we collected 42 strains of T. bisporus from different hosts in different regions of China, and studied the genetic diversity among them using random amplified polymorphic DNA (RAPD). Cluster analysis Forty-two strains were divided into three groups based on 80% similarity (Groups A, B and AB). A group contained 4 strains isolated from Populus tomentosa; B contained 37 strains isolated from the Populus and Populus; Populations AB only contained one strain isolated from Populus tomentosa. Inferred that the AB group of strains may be A group of strains to B group evolution of a transitional type.