Bacillus velezensis stimulates resident rhizosphere Pseudomonas stutzeri for plant health through metabolic interactions.
Xinli SunZhihui XuJiyu XieViktor Hesselberg-ThomsenTaimeng TanDaoyue ZhengMikael Lenz StrubeAnna DragošQirong ShenRuifu ZhangÁkos T KovácsPublished in: The ISME journal (2021)
Trophic interactions play a central role in driving microbial community assembly and function. In gut or soil ecosystems, successful inoculants are always facilitated by efficient colonization; however, the metabolite exchanges between inoculants and resident bacteria are rarely studied, particularly in the rhizosphere. Here, we used bioinformatic, genetic, transcriptomic, and metabonomic analyses to uncover syntrophic cooperation between inoculant (Bacillus velezensis SQR9) and plant-beneficial indigenous Pseudomonas stutzeri in the cucumber rhizosphere. We found that the synergistic interaction of these two species is highly environmental dependent, the emergence of syntrophic cooperation was only evident in a static nutrient-rich niche, such as pellicle biofilm in addition to the rhizosphere. Our results identified branched-chain amino acids (BCAAs) biosynthesis pathways are involved in syntrophic cooperation. Genome-scale metabolic modeling and metabolic profiling also demonstrated metabolic facilitation among the bacterial strains. In addition, biofilm matrix components from Bacillus were essential for the interaction. Importantly, the two-species consortium promoted plant growth and helped plants alleviate salt stress. In summary, we propose a mechanism in which synergic interactions between a biocontrol bacterium and a partner species promote plant health.
Keyphrases
- plant growth
- microbial community
- pseudomonas aeruginosa
- public health
- healthcare
- staphylococcus aureus
- antibiotic resistance genes
- mental health
- biofilm formation
- escherichia coli
- candida albicans
- patient safety
- single cell
- amino acid
- genome wide
- health information
- climate change
- gene expression
- human health
- hepatitis c virus
- emergency medicine