Characterization of the Endophytic Bacillus subtilis KRS015 Strain for Its Biocontrol Efficacy Against Verticillium dahliae
文献类型： 外文期刊
第一作者： Song, Jian
作者： Song, Jian;Wang, Dan;Zhang, Dan-Dan;Li, Ran;Kong, Zhi-Qiang;Dai, Xiao-Feng;Chen, Jie-Yin;Han, Dongfei;Zhang, Dan-Dan;Li, Ran;Kong, Zhi-Qiang;Dai, Xiao-Feng;Chen, Jie-Yin;Subbarao, Krishna V.
作者机构：
关键词： Bacillus subtilis; biological control; plant growth promotion; plant immunity; Verticillium dahliae; Verticillium wilt
期刊名称：PHYTOPATHOLOGY （ 影响因子：3.2； 五年影响因子：3.9 ）
ISSN： 0031-949X
年卷期： 2024 年 114 卷 1 期
页码：
收录情况： SCI
摘要： Endophytes play important roles in promoting plant growth and controlling plant diseases. Verticillium wilt is a vascular wilt disease caused by Verticillium dahliae, a widely distributed soilborne pathogen that causes significant economic losses on cotton each year. In this study, an endophyte KRS015, isolated from the seed of the Verticillium wilt-resistant Gossypium hirsutum 'Zhongzhimian No. 2', was identified as Bacillus subtilis by morphological, phylogenetic, physiological, and biochemical analyses. The volatile organic compounds (VOCs) produced by KRS015 or its cell-free fermentation extract had significant antagonistic effects on various pathogenic fungi, including V. dahliae. KRS015 reduced Verticillium wilt index and colonization of V. dahliae in treated cotton seedlings significantly; the disease reduction rate was similar to 62%. KRS015 also promoted plant growth, potentially mediated by the growth-related cotton genes GhACL5 and GhCPD-3. The cell-free fermentation extract of KRS015 triggered a hypersensitivity response, including reactive oxygen species (ROS) and expression of resistance-related plant genes. VOCs from KRS015 also inhibited germination of conidia and the mycelial growth of V. dahliae, and were mediated by growth and development-related genes such as VdHapX, VdMcm1, Vdpf, and Vel1. These results suggest that KRS015 is a potential agent for controlling Verticillium wilt and promoting growth of cotton.
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