Functional diversification of the GALA type III effector family contributes to Ralstonia solanacearum adaptation on different plant hosts
Remigi , Philippe (INRA , Auzeville (France). UMR 0441 Interactions Plantes - Microorganismes) | Anisimova , Maria (Swiss Federal Institute of TechnologySwiss Institute of Bioinformatics(Suisse). Department of Computer Science) | Guidot , Alice (INRA , Auzeville (France). UMR 0441 Interactions Plantes - Microorganismes) | Genin , Stéphane (INRA , Auzeville (France). UMR 0441 Interactions Plantes - Microorganismes) | Peeters , Nemo(auteur de correspondance) (INRA , Auzeville (France). UMR 0441 Interactions Plantes - Microorganismes)
From sequences available, we reconstructed GALA phylogeny and performed selection studies. We then focused on the GALAs from the reference strain GMI1000 to examine their ability to suppress plant defense responses and contribution to pathogenicity on three different host plants: A. thaliana, tomato (Lycopersicum esculentum) and eggplant (Solanum melongena). The GALA family is well conserved within R. solanacearum species. Patterns of selection detected on some GALA family members, together with experimental results, show that GALAs underwent functional diversification. We conclude that functional divergence of the GALA family likely accounts for its remarkable conservation during R. solanacearum evolution and could contribute to R. solanacearum’s adaptation on several host plants.
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