Summary
This study characterises how the plant-beneficial bacterium Bacillus velezensis perceives and responds to competition from Pseudomonas in soil environments. The research reveals that B. velezensis detects the competitor's siderophore pyochelin as an info-chemical signal, triggering a multimodal defensive metabolite response including antibiotics and biofilm-promoting compounds. The findings extend understanding of siderophore-mediated microbial interactions beyond iron competition, suggesting a novel signalling mechanism in rhizosphere microbial ecology.
UK applicability
This laboratory-based mechanistic study of rhizosphere microbial interactions is foundational to understanding biocontrol and plant-associated microbial ecology globally, including UK agricultural systems. Translation to practical biocontrol or inoculant development would require field validation under UK soil and climatic conditions.
Key measures
Secondary metabolite production profiles (polyketides, amylocyclicin bacteriocin, surfactin lipopeptides); biofilm formation; bacterial motility; siderophore-mediated signalling responses
Outcomes reported
The study demonstrated that B. velezensis mobilises a substantial portion of its secondary metabolome in response to Pseudomonas competition, involving polyketides, bacteriocins, and lipopeptides. It identified pyochelin, a Pseudomonas siderophore, as an info-chemical trigger for this defensive response independent of iron stress.
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