Members of the genus Bacillus are known to play an important role in promoting plant growth and protecting plants against phytopathogenic microorganisms. In this study, 21 isolates of Bacillus spp. were obtained from the root micro-ecosystem of Suaeda glauca. Analysis of the 16S rRNA genes indicated that the isolated belong to the species Bacillus amyloliquefaciens, Bacillus velezensis, Bacillus subtilis, Bacillus pumilus, Bacillus aryabhattai and Brevibacterium frigoritolerans. One of the interesting findings of this study is that four strains B1, B5, B16 and B21 are dominant in rhizosphere soil. Based on gyrA, gyrB and rpoB gene analyses, B1, B5, B21 were identified as B. amyloliquefaciens and B16 was identified as B. velezensis. Estimation of antifungal activity showed that the isolate B1 had a significant inhibitory effect on Fusarium verticillioides, B5 and B16 on Colletotrichum capsici (syd.) Butl, and B21 on Rhizoctonia cerealis van der Hoeven. The four strains grew well in medium with 1-10% NaCl and a pH value of 5-8, and promoted the growth of Arabidopsis thaliana. These results indicate that they may be promising agents for the biocontrol and promotion of plant growth and further study of the relevant bacteria provides a reference for the development of microbial resources.

中文翻译：

---

芽孢杆菌的概况。从碱蓬的根际分离及其促进植物生长和抑制真菌性植物病原体的潜力。

已知芽孢杆菌属的成员在促进植物生长和保护植物免受植物病原微生物侵害方面发挥重要作用。在这项研究中，21 株芽孢杆菌分离株。是从碱蓬的根部微生态系统中获得的。16S rRNA基因分析表明，分离出的菌株属于解淀粉芽孢杆菌、贝莱森芽孢杆菌、枯草芽孢杆菌、短小芽孢 杆菌、亚巴泰芽孢杆菌和耐寒短杆菌。. 这项研究的一个有趣发现是，四种菌株 B1、B5、B16 和 B21 在根际土壤中占优势。基于gyrA、gyrB和rpoB基因分析，B1、B5、B21 被鉴定为解淀粉芽孢杆菌，B16 被鉴定为B.velezensis。抗真菌活性的评估表明，分离株 B1 对轮枝状镰刀菌具有显着抑制作用，B5 和 B16 对辣椒炭疽菌(syd.) Butl 具有显着抑制作用，B21 对Rhizoctonia cerealis van der Hoeven 具有显着抑制作用。4株菌株在NaCl浓度为1-10%、pH值为5-8的培养基中生长良好，促进了拟南芥的生长. 这些结果表明它们可能是有前途的生物防治和促进植物生长的药剂，相关细菌的进一步研究可为微生物资源的开发提供参考。