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Plant-derived citronellol can significantly disrupt cell wall integrity maintenance of Colletotrichum camelliae

文献类型： 外文期刊

作者： Zhang, Jiying 1 ; Liu, Huifang 1 ; Yao, Jianmei 3 ; Ma, Chiyu 3 ; Yang, Wen 3 ; Lei, Zhiwei 3 ; Li, Rongyu 1 ;

作者机构： 1.Guizhou Univ, Coll Tea Sci, Guiyang 550025, Peoples R China

2.Guizhou Univ, Inst Crop Protect, Guiyang 550025, Peoples R China

3.Guizhou Acad Agr Sci, Guizhou Tea Res Inst, Guiyang 550006, Peoples R China

4.Prov Key Lab Agr Pest Management Mountainous Reg G, Guiyang 550025, Peoples R China

关键词： Colletotrichum camelliae; Tea anthracnose disease; Citronellol; Antifungal activity; Biochemical mechanism

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：4.2； 五年影响因子：4.6 ）

ISSN： 0048-3575

年卷期： 2024 年 204 卷

页码：

收录情况： SCI

摘要： Anthracnose, a fungal disease, commonly infects tea plants and severely impacts the yield and quality of tea. One method for controlling anthracnose is the application of citronellol, a plant extract that exhibits broad-spectrum antimicrobial activity. Herein, the physiological and biochemical mechanism by which citronellol controls anthracnose caused by Colletotrichum camelliae was investigated. Citronellol exhibited excellent antifungal activity based on direct and indirect mycelial growth inhibition assays, with EC50 values of 76.88 mg/L and 29.79 mu L/L air, respectively. Citronellol also exhibited good control effects on C. camelliae in semi-isolated leaf experiments. Optical and scanning electron microscopy revealed that citronellol caused C. camelliae mycelia to thin, fracture, fold and deform. Transmission electron microscopy revealed that the mycelial cell walls collapsed inward and separated, and the organelles became blurred after treatment with citronellol. The sensitivity of C. camelliae to calcofluor white staining was significantly enhanced by citronellol, while PI staining showed minimal fluorescence, and the relative conductivity of mycelia were not significantly different. Under citronellol treatment, the expression levels of beta-1,3-glucanase, chitin synthase, and chitin deacetylase-related genes were significantly decreased, while the expression levels of chitinase genes were increased, leading to lower chitinase activity and increased beta-1,3-glucanase activity. Therefore, citronellol disrupted the cell wall integrity of C. camelliae and inhibited normal mycelial growth.

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