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Biocontrol Ability and Mechanism of a Broad-Spectrum Antifungal Strain Bacillus safensis sp. QN1NO-4 Against Strawberry Anthracnose Caused by Colletotrichum fragariae

文献类型： 外文期刊

作者： Li, Xiaojuan 1 ; Zhang, Miaoyi 1 ; Qi, Dengfeng 1 ; Zhou, Dengbo 1 ; Qi, Chunlin 3 ; Li, Chunyu 4 ; Liu, Siwen 4 ; Xiang, Dandan 4 ; Zhang, Lu 2 ; Xie, Jianghui 1 ; Wang, Wei 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Key Lab Biol & Genet Resources Trop Crops, Minist Agr, Haikou, Hainan, Peoples R China

2.Hainan Normal Univ, Coll Life Sci, Minist Educ, Key Lab Ecol Trop Islands, Haikou, Hainan, Peoples R China

3.Hainan Univ, Coll Ecol & Environm, Haikou, Hainan, Peoples R China

4.Guangdong Acad Agr Sci, Key Lab South Subtrop Fruit Biol & Genet Resource, Minist Agr,Inst Fruit Tree Res, Key Lab Trop & Subtrop Fruit Tree Res Guangdong P, Guangzhou, Peoples R China

关键词： Bacillus safensis; Colletotrichum fragariae; biological control; antifungal properties; strawberry fruit; whole genome sequencing

期刊名称：FRONTIERS IN MICROBIOLOGY （ 影响因子：5.2； 五年影响因子：6.2 ）

ISSN：

年卷期： 2021 年 12 卷

页码：

收录情况： SCI

摘要： Strawberry is a very popular fruit with a special taste, color, and nutritional value. Anthracnose caused by Colletotrichum fragariae severely limits fruit shelf life during post-harvest storage. Use of traditional chemical fungicides leads to serious environment pollution and threatens food safety. Biocontrol is considered as a promising strategy to manage the post-harvest fruit diseases. Here, strain QN1NO-4 isolated from noni (Morinda citrifolia L.) fruit exhibited a high antifungal activity against C. fragariae. Based on its physicochemical profiles and phylogenetic tree of the 16S rRNA sequence, strain QN1NO-4 belonged to the genus Bacillus. The average nucleotide identity (ANI) calculated by comparing two standard strain genomes was below 95-96%, suggesting that the strain might be a novel species of the genus Bacillus and named as Bacillus safensis sp. QN1NO-4. Its extract effectively reduced the incidence of strawberry anthracnose of harvested fruit. Fruit weight and TSS contents were also maintained significantly. The antifungal mechanism assays indicated that the extract of the test antagonist inhibited mycelial growth and spore germination of C. fragariae in vitro. Cells of strain QN1NO-4 demonstrated the cytoplasmic heterogeneity, disappeared organelles, and ruptured ultrastructure. Notably, the strain extract also had a broad-spectrum antifungal activity. Compared with the whole genome of strain QN1NO-4, several functional gene clusters involved in the biosynthesis of active secondary metabolites were observed. Fifteen compounds were identified by gas chromatography-mass spectrometry (GC-MS). Hence, the fruit endophyte B. safensis sp. QN1NO-4 is a potential bio-agent identified for the management of post-harvest disease of strawberry fruit.

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