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Poster

Session: Session 2 Presenting Authors at Posters (Odds)

P-345 - High nitrogen availability suppresses microbiota-mediated age-related resistance

Wednesday, July 16, 2025
13:30 - 15:15  
Location: Confex Hall 3
Plant microbiota functions and intermicrobial interactions
Nitrogen is an essential macronutrient for plant health, and its availability often limits plant growth and development. Accordingly, nitrogen nutrition affects many aspects of plant health, from amino acid metabolism to stress responses. To carry out these diverse functions, nitrogen can behave as both a direct signal and as a metabolite. Nitrogen-rich growth conditions have been observed to result in an increase in disease susceptibility in several pathosystems, however the mechanisms of this phenomenon have not been fully elucidated. We have observed that nitrogen-rich conditions alter the composition of the bacterial microbiota in Arabidopsis leaves. Additionally, in gnotobiotic growth set-ups, nitrogen-rich conditions only suppress pattern triggered immunity (PTI) when plants are grown in the presence of microbiota; plants that are grown in sterile conditions do not exhibit nitrogen induced immunosuppression. Together, this evidence suggests an important but unexplored role of nitrogen in mediating microbiota-dependent age-related resistance. Ongoing work will elucidate the signaling cascade from high nitrogen sensing to immune suppression in shaping plant-microbiota interactions.