Contrasting recombination patterns and demographic histories of the plant pathogen Ralstonia solanacearum inferred from MLSA - Université de La Réunion Access content directly
Journal Articles The International Society of Microbiologial Ecology Journal Year : 2012

Contrasting recombination patterns and demographic histories of the plant pathogen Ralstonia solanacearum inferred from MLSA

Abstract

We used multilocus sequence analysis (MLSA) on a worldwide collection of the plant pathogenic Ralstonia solanacearum (Betaproteobacteria) to retrace its complex evolutionary history. Using genetic imprints left during R. solanacearum evolution, we were able to delineate distinct evolutionary complex displaying contrasting dynamics. Among the phylotypes already described (I, IIA, IIB, III, IV), eight groups of strains with distinct evolutionary patterns, named clades, were identified. From our recombination analysis, we identified 21 recombination events that occurred within and across these lineages. Although appearing the most divergent and ancestral phylotype, phylotype IV was inferred as a gene donor for the majority of the recombination events that we detected. Whereas this phylotype apparently fuelled the species diversity, ongoing diversification was mainly detected within phylotype I, IIA and III. These three groups presented a recent expanding population structure, a high level of homologous recombination and evidences of long-distance migrations. Factors such as adaptation to a specific host or intense trading of infected crops may have promoted this diversification. Whether R. solanacearum lineages will eventually evolve in distinct species remains an open question. The intensification of cropping and increase of geographical dispersion may favour situations of phylotype sympatry and promote higher exchange of key factors for host adaptation from their common genetic pool. (Résumé d'auteur)

Dates and versions

hal-01199343 , version 1 (15-09-2015)

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Emmanuel Wicker, Pierre Lefeuvre, Jean-Charles de Cambiaire, Christophe Lemaire, Stéphane Poussier, et al.. Contrasting recombination patterns and demographic histories of the plant pathogen Ralstonia solanacearum inferred from MLSA. The International Society of Microbiologial Ecology Journal, 2012, 6 (5), pp.961--974. ⟨10.1038/ismej.2011.160⟩. ⟨hal-01199343⟩
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