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Poster

Session: Session 1 Presenting Authors at Posters (Odds)

P-415 - Innovating rhizobium Inoculants and plant breeding strategies: Unlocking genotype interactions in legume-rhizobium symbiosis

Monday, July 14, 2025
13:30 - 15:15  
Location: Confex Hall 3
Symbiosis and Mutualism (mycorrhiza and N-fixing Rhizobia)
Legume-rhizobium symbiosis offers a sustainable nitrogen source for agriculture. The efficiency of nitrogen fixation is influenced by the genotypes of both legumes and rhizobia, yet the effects of their interactions on plant performance in environments with multiple competing rhizobium strains remain poorly understood. In this study, we assessed 399 strains of Rhizobium leguminosarum complex sv. viciae competing for nodulation on 212 faba bean genotypes. Our findings reveal that these strains can be grouped based on their nodule occupancy profiles, which correspond to distinct competitive interactions and varying plant growth-promoting effects. Additionally, we demonstrate that the diversity of rhizobial strains occupying root nodules significantly impacts plant growth and is regulated by plant genetic factors. These insights lay the groundwork for re-designing rhizobium inoculation practices and refining plant breeding strategies to enhance symbiotic nitrogen fixation in agricultural systems.