国内橡胶树尖孢炭疽复合种种间分子系统发育及生物学特性分析

为明确国内橡胶树尖孢炭疽复合种内不同种的生物学特性及种间差异情况,评价了4个代表性菌株（Colletotrichum bannanense YNML52,C. laticiphilum YNJH17109,C. australisinense GX1655,YNJP162）对不同碳源、氮源的利用情况,以及在不同温度、pH、水活度下的生长情况,并评价了这些菌株对橡胶不同品种和不同作物的致病性。结果表明：供试菌株在碳源、氮源利用,适宜生长温度、致死温度、pH和水分活度等方面均存在显著差异;致病性分析表明,供试菌株的致病谱也存在显著差异,YNML52的寄主范围较窄,具有很强的寄主专化性。通过评价生态因子对橡胶树炭疽病病原菌生物学特性的影响,为深入了解橡胶病害发生规律和制定有效防控措施提供指导依据。

Interspecific Molecular Phylogeny and Biological Characteristics of Colletotrichum acutatum Complex Species Causing Colletotrichum Leaf Disease on Rubber Trees in China

In order to clarify the biological characteristics and interspecific differences of Colletotrichum acutatum complex species from rubber trees in China, four representative strains (C. bannanense YNML52, C. laticiphilum YNJH17109, C. australisinense GX1655, YNJP162) were evaluated for the utilization of different carbon, nitrogen sources and colony growth at different temperature, pH and water activities. The pathogenicity of the strains to different rubber varieties and crops was also evaluated. There were significant differences in the utilization of carbon and nitrogen sources, suitable growth temperature, lethal temperature, pH value and water activity of the tested strains. There were significant differences in pathogenicity spectrum of the tested strains. YNML52 had a narrow host range and strong host specificity. Evaluating the effects of ecological factors on the biological characteristics of the pathogen of rubber tree anthracnose is of certain guiding significance for understanding the occurrence regularity of the disease and formulating effective control strategies.