Combination effects of tebuconazole with Bacillus subtilis to control rice false smut and the related synergistic mechanism

文献类型： 外文期刊

第一作者： Liu, Lianmeng

作者： Liu, Lianmeng;Zhao, Kehan;Cai, Lubin;Zhang, Yilin;Fu, Qiang;Huang, Shiwen;Liu, Lianmeng;Huang, Shiwen

作者机构：

关键词： rice; rice false smut; Bacillus subtilis; tebuconazole; synergistic; combination; biofilm; CYP51

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.462； 五年影响因子：4.688 ）

ISSN： 1526-498X

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页码：

收录情况： SCI

摘要： Background Management of rice false smut is based mainly on chemical control, which poses many safety and environmental challenges. The other option, biological control with biofungicides, does not have such problems but is not as reliable because of low systemic ability, and lower and unstable efficacy. Therefore, it is necessary to combine application of chemical fungicides and biological control agents (BCAs) and elucidate their synergistic mechanism. Results A combination of tebuconazole and a proven BCA, Bacillus subtilis H158, was evaluated for control of rice false smut. Tebuconazole at low application rates stimulated growth of B. subtilis, prolonged the effective period of B. subtilis by enhancing its persistence on the surface of rice plants, accelerated biofilm formation of the BCA to facilitate colonization, promoted induced systemic resistance in rice by regulating defense-related enzymes and genes, and reduced the natural resistance of the pathogen by suppressing the key gene for fungal resistance to tebuconazole. However, at high application rates, tebuconazole had adverse effects on these factors and showed antagonistic combination effects with B. subtilis. The combination of B. subtilis with tebuconazole at low application rates showed great synergistic effects, but at high application rates showed only antagonistic effects in field experiments over two consecutive years. Conclusion The combination of B. subtilis with tebuconazole had significant synergistic effects at low application rates. The synergistic effects are the result of multiple mechanisms involved in BCA, rice and the fungal pathogen. (c) 2022 Society of Chemical Industry.

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