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Characterization and sequence analysis of potential biofertilizer and biocontrol agent Bacillus subtilis strain SEM-9 from silkworm excrement

文献类型： 外文期刊

作者： Li, Qingrong 1 ; Liao, Sentai 1 ; Zhi, Huyu 3 ; Xing, Dongxu 1 ; Xiao, Yang 1 ; Yang, Qiong 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Sericulture & Agrifood Res Inst, Guangzhou 510610, Guangdong, Peoples R China

2.Minist Agr, Key Lab Urban Agr South China, Guangzhou 510610, Guangdong, Peoples R China

3.Guangdong Geolong Biotechnol Co Ltd, Zhuhai 519000, Peoples R China

关键词： characterization; sequence analysis; biofertilizer; biocontrol agent; silkworm excrement

期刊名称：CANADIAN JOURNAL OF MICROBIOLOGY （ 影响因子：2.419； 五年影响因子：2.35 ）

ISSN： 0008-4166

年卷期： 2019 年 65 卷 1 期

页码：

收录情况： SCI

摘要： Fusarium wilt is a devastating soil-borne disease caused mainly by highly host-specific formae speciales of Fusarium oxysporum. Antagonistic microorganisms play a very important role in Fusarium wilt control, and the isolation of potential biocontrol strains is becoming more and more important. We isolated a bacterial strain (SEM-9) from the high-temperature stage of silkworm excrement composting, which had a marked ability to solubilize phosphorus, promote the growth and increase the yield of the small Chinese cabbage, and which also exhibited considerable antagonistic effect towards Fusarium sambucinum and other fungi. The result of physiological and biochemical analyses, as well as genome sequencing, showed that SEM-9 was a strain of Bacillus subtilis. Through genome annotation and analysis, it was found that SEM-9 contained genes related to the regulation of biofilm formation, which may play an important role in colonization, and gene clusters encoding the biosynthesis of antimicrobials, such as surfactin, bacilysin, fengycin, and subtilosin-A. The production of such antifungal compounds may constitute the basis of the mode-of-action of SEM-9 against Fusarium spp. These data suggested that the SEM-9 strain has potential as both a biofertilizer and a biocontrol agent, with the potential to manage Fusarium wilt disease in crops.

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