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Poster

Session: Session 2 Presenting Authors at Posters (Evens)

P-358 - Metabolic crosstalks between the root microbiota and plant immunity through glutamate signalling

Thursday, July 17, 2025
13:30 - 15:15  
Location: Confex Hall 3
Plant microbiota functions and intermicrobial interactions

Plant roots exude an array of metabolites which can potentially modulate its microbiota. Among core plant metabolites, glutamate can act as a long-distance signaling molecule to prompt host systemic immunity, consequently restricting root elongation reflecting the growth-defense trade-offs. The mechanism by which the root microbiota can tinker systemic immunity by tampering host glutamate homeostasis remains unknown. In this study, we profiled in vitro capacities of a multi-kingdom root microbiota members (94 bacteria, 18 fungi, and 1 oomycete) for glutamate consumption and in planta de-repression of glutamate-mediated root growth inhibition. Inoculation of multi-kingdom synthetic microbial communities relieves the glutamate impedance of apical root elongation suggestive that rescue of glutamate-root growth restriction is a dominant community trait. Moreso, glutamate consumption is prevalent across the root microbiota with copious consumers from Alphaproteobacteria, Gammaproteobacteria, and Sordariomycetes indicating possible metabolic interference of the host glutamate signaling by root microbiota members. These findings leverage our understanding of plant-microbiota dialogues through metabolic interference of immune info-chemicals along the microbiota-root-shoot circuit.