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Disruption of putrescine export in experimentally evolved Ralstonia pseudosolanacearum enhances symbiosis with Mimosa pudica
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Disruption of putrescine export in experimentally evolved Ralstonia pseudosolanacearum enhances symbiosis with Mimosa pudica
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Disruption of putrescine export in experimentally evolved Ralstonia pseudosolanacearum enhances symbiosis with Mimosa pudica
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Journal Article
Disruption of putrescine export in experimentally evolved Ralstonia pseudosolanacearum enhances symbiosis with Mimosa pudica
2026
Overview
Rhizobia, the nitrogen-fixing symbionts of legumes, emerged through repeated and independent horizontal transfers of some essential symbiotic genes. However, these transfers alone are often insufficient to convert the recipient bacterium into a functional legume symbiont. In a laboratory experiment, we evolved the plant pathogen Ralstonia pseudosolanacearum into a nodulating and intracellularly infecting symbiont of Mimosa pudica . This transition required genomic modifications in the recipient bacterium to activate its acquired symbiotic potential. Here, we demonstrated that one of these key adaptive modifications is the inactivation of bacterial putrescine export. This polyamine, when produced by the microsymbiont, appears to act as a negative signal for the plant. This study provides new insights into the distinct roles of bacterial- and plant-derived putrescine in plant–microbe interactions, highlighting their functional divergence despite being produced by both organisms.
Publisher
American Society for Microbiology
Subject
/ Bacteria
/ Bacterial Interactions with Plants
/ Bacterial Proteins - genetics
/ Bacterial Proteins - metabolism
/ Bacterial-Eukaryotic Interactions
/ Biochemistry, Molecular Biology
/ Botanics
/ Cloning
/ E coli
/ Genes
/ legume
/ Legumes
/ Microbial Ecology and Evolution
/ Microbial Physiology and Genetics
/ Microbiology and Parasitology
/ Mutation
/ Nitrogen
/ Nodules
/ Peptides
/ Proteins
/ Ralstonia pseudosolanacearum
/ Root Nodules, Plant - microbiology
/ Symbiosis and Host Interactions
/ Xylem
