Bacillus velezensis SS-20 as a potential and efficient multifunctional agent in biocontrol, saline-alkaline tolerance, and plant-growth promotion

文献类型： 外文期刊

第一作者： Chen, Zhaoliang

作者： Chen, Zhaoliang;Zhang, Haiyun;Lv, Weiguang;Zhang, Siyi;Li, Shuangxi;Zhang, Hanlin;Zheng, Xianqing;Zhang, Juanqin;Bai, Naling;Du, Linna;Li, Shuangxi;Zhang, Hanlin;Zheng, Xianqing;Zhang, Juanqin;Bai, Naling;Li, Shuangxi;Zhang, Hanlin;Zheng, Xianqing;Zhang, Juanqin;Bai, Naling;Zhang, Tinglin

作者机构：

关键词： Bacillus velezensis; Antagonistic activity; Saline-alkaline tolerance; Growth promotion; Whole-genome sequencing

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 205 卷

页码：

收录情况： SCI

摘要： The versatile strain Bacillus velezensis SS-20 was studied to determine its agricultural benefits, including its ability to antagonize fungi, promote plant growth, and tolerate saline-alkaline conditions. Firstly, strain SS-20 was found to be an antagonist of plant pathogenic fungi such as Magnaporthe oryzae, Rhizoctonia solani, and Fusarium oxysporum, with control effects up to 82.07 %, 46.57 %, and 23.09 %, respectively. The hyphae of pathogenic fungi treated with SS-20 and its fermentation product were abnormal, swollen, deformed, and distorted. Meanwhile, strain SS-20 dissolved inorganic phosphorus (phosphate solubilization efficiency, 45.95 %), and produced siderophore (siderophore units, 54.18 +/- 4.19 %), and poly-gamma-glutamic acid (gamma-PGA) (13.35 +/- 2.61 g/ L). Strain SS-20 significantly increased plant height, aboveground fresh weight, and root dehydrogenase activity compared to the control treatment under non-saline conditions (p < 0.05). In addition, strain SS-20 showed significant saline-alkaline tolerance, surviving in 10 % NaCl and pH 9.5, and enhanced plant growth under simulated saline-alkali conditions. Whole-genome sequencing analysis revealed that the chromosome of B. velezensis SS-20 consists of 3,929,792-bp with 46.5 % guanine-cytosine content and 4015 coding sequences. The antiSMASH analysis identified 12 gene clusters within strain SS-20 that encode antimicrobial compounds such as surfactin, fengycin, butirosin A/butirosin B, macrolactin H, bacillibactin, difficidin, and bacilysin, thereby corroborating the strain's biocontrol capabilities. Genes related to plant growth promotion, including siderophores, gamma-PGA, indole acetic acid production, phosphate solubilization, glycine-betaine production, and Na+/H+ antiporters, were also annotated. In conclusion, B. velezensis SS-20 represents a promising biotic resource for enhancing plant growth and protecting against environmental stresses.

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