Mechanisms driving the spatial structure of root microbial colonization

演題

Mechanisms driving the spatial structure of root microbial colonization

講演者

Dr. Niko Geldner (Department of Plant Molecular Biology, University of Lausanne, Switzerland)

使用言語

English

日時

2025年6月4日(水曜日) 15：00～16：00

場所

C109 Large seminar room

内容

Plant roots use exudates to assemble microbiomes that in turn influence the function and stress resilience of plants. Yet, how specific exudates drive spatial colonization patterns remains largely unknown. Here, we demonstrate that endodermal Casparian strips, forming the root extracellular diffusion barrier, restrict nutrient leakage into the rhizosphere, coinciding with and controlling spatial colonization patterns of rhizobacteria. We find that vasculature-derived glutamine is a major bacterial chemoattractant and enhancer of proliferation, defining a novel leakage pathway for root exudate formation. Bacteria defective in amino acid chemoperception display reduced attraction towards leakage sites, and roots with Casparian strip defects display bacterial over-proliferation, dependent on bacterial capacity for amino acid metabolization. An associated, chronic immune stimulation suggests that endodermal nutrient restriction is crucial for beneficial microbial colonization.

問合せ先

Plant Developmental Signaling
Nakajima Keiji (k-nakaji@bs.naist.jp)