Inhibitory effect of volatile organic compounds from Bacillus flexus TR-1 against Aspergillus flavus and aflatoxins in grains during storage

文献类型： 外文期刊

第一作者： Gong, An-Dong

作者： Gong, An-Dong;Song, Meng-Ge;Wang, Gao-Zhan;Wang, Hua-Ling;Wang, Jian-Hua;Zhang, Jing-Bo

作者机构：

关键词： Aspergillus flavus; Aflatoxin; Bacillus flexus; Volatile organic compounds

期刊名称：BIOCONTROL （ 影响因子：2.5； 五年影响因子：2.8 ）

ISSN： 1386-6141

年卷期： 2023 年 68 卷 2 期

页码：

收录情况： SCI

摘要： Aspergillus flavus infects stored grains and produces aflatoxins with highly toxic and carcinogenic properties, which are a threat to food safety and human health. Microbes and their bio-active compounds are considered effective agents to control A. flavus and aflatoxins during the pre- and post-harvest stages. Here, we reveal that Bacillus flexus strain TR-1 isolated from tea plant rhizosphere soil could efficiently inhibit the growth of A. flavus in dual culture tests through the production of antifungal volatiles. Additionally, these volatiles showed great inhibitory effects against A. flavus infection and aflatoxin production in maize and peanut with high water activity levels during storage. Scanning electron microscope analysis further proved that the conidia of A. flavus on the peanut surface treated with TR-1 volatiles could not germinate and were severely dehydrated and shrunken. Gas chromatography-tandem mass spectrometry revealed that five antifungal compounds were identified in the volatile profiles, including benzene, methyl thiolacetate, dimethyl disulfide, butanethioic acid S-methyl ester analogue, dimethyl trisulfide (DMTS), and S-methyl 3-methylbutanethioate. DMTS, with the best antagonistic effect, completely inhibited the growth of A. flavus at 10 mu l(-1) (compound volume/airspace volume). TR-1 also exhibited efficient and broad inhibitory effects against six other fungal pathogens. Overall, B. flexus strain TR-1 and its produced volatiles showed valid antifungal activity against phytopathogens. This study provides novel materials for the production of bioactive agents to control plant pathogens in stored grains.

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