The effectiveness of the interaction between legumes and rhizobia is determined by the genotypes of both partners.

Researchers from the Laboratory of Molecular and Cell Biology, ARRIAM together with Spanish colleagues from the University of Salamanca, studied the interaction between three pea genotypes and six Rhizobium laguerreae strains, classified into three genospecies (gsN, gsO, gsR) using whole-genome phylogenetic analysis. The histological and ultrastructural features of the nodules formed by each pea genotype and each rhizobia strain were examined. Both normally developing symbioses and those with various disruptions in the infection process, bacterial release, differentiation of bacteria into bacteroids, and the ability of bacteroids to maintain their functional activity were identified. The cv. ‘Rondo’ was shown to be the most successful in forming symbioses with R. laguerreae strains, while the AMPS05 strain was the most effective with all three pea genotypes studied. Thus, the efficiency of interaction in symbioses formed between pea and R. laguerreae strains depends on the genotypes of both partners.

This research was supported by RSF 23-16-00090.

Kirichek E.A., Tsyganova A.V., Flores-Félix J.D., Velázquez E., Tsyganov V.E. Archives of microbiology 208 (2), 91 https://doi.org/10.1007/s00203-025-04595-7