<i>Medicago</i>-<i>Sinorhizobium</i>-<i>Ralstonia</i>: A Model System to Investigate Pathogen-Triggered Inhibition of Nodulation

How plants deal with beneficial and pathogenic microorganisms how they can tolerate ones face pathogens at the same time are questions that remain puzzling to plant biologists. Legume good models explore those issues, as their interactions nitrogen-fixing bacteria called rhizobia results in a drastic easy-to-follow phenotype of nodulation. Intriguingly, despite massive chronic infection, legume defense reactions essentially suppressed during whole symbiotic process, raising question about potential negative effect immune responses on establishment In present study, we used model legume, Medicago truncatula, coinoculated mutualistic phytopathogenic bacteria, Sinorhizobium medicae Ralstonia solanacearum, respectively. We show presence R. solanacearum drastically inhibits nodulation process. The type III secretion system which is important for inhibition pathogen-associated molecular pattern–triggered immunity (PTI), strongly contributes inhibit Thus, our PTI By including bacterium interaction system, study provides new angle address influence biotic environment [Formula: see text] Copyright © 2021 Author(s). This an open access article distributed under CC BY-NC-ND 4.0 International license .