Fengycin produced by Bacillus subtilis NCD-2 plays a major role in biocontrol of cotton seedling damping-off disease

文献类型： 外文期刊

第一作者： Guo, Qinggang

作者： Guo, Qinggang;Dong, Weixin;Li, Shezeng;Lu, Xiuyun;Wang, Peipei;Zhang, Xiaoyun;Ma, Ping;Dong, Weixin;Wang, Ye

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关键词： Lipopeptide;Inhibition;Mutagenicity;Rhizoctonia solani

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：5.415； 五年影响因子：6.038 ）

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收录情况： SCI

摘要： Bacillus subtilis strain NCD-2 is strongly antagonistic toward phytopathogenic fungi, and functions as an excellent biocontrol agent for cotton soil-borne diseases. The aims of this study were to characterize the main active antifungal compound from strain NCD-2 and clarify its role in suppressing cotton damping-off disease. Strain NCD-2 and lipopeptide extract prepared from an NCD-2 culture strongly inhibited the growth of Rhizoctonia solani in vitro. The lipopeptides of strain NCD-2 were separated by fast protein liquid chromatography (FPLC) and the antifungal compound was identified as a cluster of fengycin homologs analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. A fengycin-deficient mutant was obtained by in-frame deletion of the fengycin synthetase gene in B. subtilis NCD-2. Compared with the wild-type strain, this mutant showed decreased abilities to inhibit the growth of R. solani in vitro and to suppress cotton damping-off disease in vivo. Studies showed that the population of fengycin-deficient mutant was almost same as that of the wild-type NCD-2 strain in the cotton rhizosphere. However, the population of R. solani in the cotton rhizosphere colonized by the fengycindeficient mutant was twice that in the cotton rhizosphere colonized by the NCD-2 wild-type strain. This study demonstrated that fengycin-type lipopeptides are the main antifungal active compounds produced by B. subtilis NCD-2. These compounds play a major role in restricting the population of R. solani in the cotton rhizosphere and in suppressing cotton damping-off disease

分类号： Q

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