Atypical rhizobia trigger nodulation and pathogenesis on the same legume hosts

Kévin Magne, Sophie Massot, Tifaine Folletti, Laurent Sauviac, Elhosseyn Ait-Salem, Ilona Pires, Maged M. Saad, Abdul Aziz Eida, Salim Bougouffa, Adrien Jugan, Eleonora Rolli, Raphaël Forquet, Virginie Puech-Pages, Fabienne Maillet, Gautier Bernal, Chrystel Gibelin, Heribert Hirt, Véronique Gruber, Rémi Peyraud, Fabienne Vailleau, Benjamin Gourion () and Pascal Ratet ()
Additional contact information
Kévin Magne: Institute of Plant Sciences Paris-Saclay
Sophie Massot: Institute of Plant Sciences Paris-Saclay
Tifaine Folletti: CNRS
Laurent Sauviac: CNRS
Elhosseyn Ait-Salem: Institute of Plant Sciences Paris-Saclay
Ilona Pires: Institute of Plant Sciences Paris-Saclay
Maged M. Saad: King Abdullah University of Science and Technology
Abdul Aziz Eida: King Abdullah University of Science and Technology
Salim Bougouffa: King Abdullah University of Science and Technology
Adrien Jugan: Institute of Plant Sciences Paris-Saclay
Eleonora Rolli: Institute of Plant Sciences Paris-Saclay
Raphaël Forquet: iMEAN
Virginie Puech-Pages: Université de Toulouse
Fabienne Maillet: CNRS
Gautier Bernal: Institute of Plant Sciences Paris-Saclay
Chrystel Gibelin: CNRS
Heribert Hirt: King Abdullah University of Science and Technology
Véronique Gruber: Institute of Plant Sciences Paris-Saclay
Rémi Peyraud: iMEAN
Fabienne Vailleau: CNRS
Benjamin Gourion: CNRS
Pascal Ratet: Institute of Plant Sciences Paris-Saclay

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract The emergence of commensalism and mutualism often derives from ancestral parasitism. However, in the case of rhizobium-legume interactions, bacterial strains displaying both pathogenic and nodulation features on a single host have not been described yet. Here, we isolated such a bacterium from Medicago nodules. On the same plant genotypes, the T4 strain can induce ineffective nodules in a highly competitive way and behave as a harsh parasite triggering plant death. The T4 strain presents this dual ability on multiple legume species of the Inverted Repeat-Lacking Clade, the output of the interaction relying on the developmental stage of the plant. Genomic and phenotypic clustering analysis show that T4 belongs to the nonsymbiotic Ensifer adhaerens group and clusters together with T173, another strain harboring this dual ability. In this work, we identify a bacterial clade that includes rhizobial strains displaying both pathogenic and nodulating abilities on a single legume host.

Date: 2024
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DOI: 10.1038/s41467-024-53388-x

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