数字农科院2.0

Revisiting causal organisms of tea anthracnose: pathogen isolation and pathogenicity identification

文献类型： 外文期刊

作者： Wenli Wang;Xin Li;Zhengzhen Li;Lan Zhang;Golam Jalal Ahammed;Xiaogui Zhou;Huawei Guo;Qiang Xiao;Meijun Tang

作者机构：

关键词： Anthracnose;Camellia sinensis;Discula;Fungal pathogen;Koch's postulates;Spore separation method

期刊名称： Beverage Plant Research

ISSN： 2769-2108

年卷期： 2025 年 5 卷

页码：

收录情况： 无来源刊（2025版）

摘要： Tea anthracnose is a major disease of tea plant (Camellia sinensis) in all tea-growing regions in China, with the southern tea region being particularly susceptible. Over the past decade, more than 20 species belonging to Colletotrichum have been identified as causal agents of tea anthracnose besides its actual pathogen Discula theae-sinensis. Although researchers have increasingly regarded Colletotrichum spp. as the primary pathogens of tea anthracnose, there is still controversy over whether they cause tea anthracnose. By employing spore isolation methods, here we identified a fungal strain causing typical tea anthracnose disease but not belonging to the genus Colletotrichum. Upon spore isolation of tea anthracnose pathogens, various methods were employed to determine the pathogenicity of the isolate cultures. Eventually, a single isolate was obtained through the spore isolation method, which was subsequently identified as Sinodiscula theae-sinensis (Discula theae-sinensis) based on its morphological and molecular characteristics. The pathogenicity assay revealed that with either wound or non-wound inoculation the isolate exhibited typical lesions that were identical to those observed on the original diseased leaves. Furthermore, all the re-isolation strains obtained from the inoculated leaves was identical to the original strain. The pathogen of tea anthracnose was further confirmed as S. theae-sinensis by Koch's validation. Additionally, the symptomatic manifestations of the inoculation by S. theae-sinensis and Colletotrichum camelliae were also compared. The symptoms induced by C. camelliae are distinct from those observed in anthracnose. This study clarified the causal pathogen of tea anthracnose, thus a crucial foundation for the identification, prevention, and control of tea anthracnose.

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