生物
放线菌门
根际
趋化性
微生物
植物
厚壁菌
解淀粉芽孢杆菌
蛋白质细菌
芽孢杆菌(形态)
微生物学
16S核糖体RNA
细菌
生物化学
遗传学
受体
作者
Li Ma,Wu-Qin Wang,Rui Shi,Xuemei Zhang,Xin Li,Yu-Sen Yang,Ming He Mo
出处
期刊:Research Square - Research Square
日期:2021-04-27
标识
DOI:10.21203/rs.3.rs-436794/v1
摘要
Abstract Understanding the role of chemotaxis in ecological interactions between plants and microbes in the rhizosphere is necessary to optimize biocontrol strategies targeting plant soil-borne diseases. Therefore, we examined and profiled the antagonistic endophytic bacteria (AEB) population with chemotaxis potential in the medicinal plant Panax notoginseng using a cheA gene-based approach coupled with 16S rRNA sequencing. Phylogenetic analysis of the chemotactic AEB (CAEB) community in P. notoginseng enabled the identification of 56 CAEB strains affiliated with 30 species of Actinobacteria, Firmicutes, and Proteobacteria; Actinobacteria, especially Bacillus , were predominant. We then systematically quantified the chemotactic response profiles of CAEB toward five organic acid (OA) attractants: citric acid (CA), fumaric acid (FA), malic acid (MA), oxalic acid (OX), and succinic acid (SA). Further hierarchical cluster analysis revealed that the chemotaxis of CAEB to the same attractant exhibited different patterns among not only genera but also species and even strains of the same species. Following chemotaxis and hierarchical analysis, we selected the strongest chemoattractant, fumaric acid (FA), as the target for evaluating the effects of OAs on the representative CAEB strain Bacillus amyloliquefaciens subsp. plantarum YP1. Application of FA significantly stimulated the chemotaxis ability and growth of YP1, and increased the transcript levels of cheA and biocontrol-related genes in YP1. This is the first study to characterise the diversity of chemotaxis profiles toward OAs in natural bacterial assemblages of P. notoginseng and to highlight how FA promotes the biocontrol-related traits of P. notoginseng -associated CAEB.
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