Journal
ISME JOURNAL
Volume 6, Issue 5, Pages 961-974Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ismej.2011.160
Keywords
homologous recombination; phylogeography; population expansion; bacterial wilt; coalescent
Categories
Funding
- European Union
- Conseil Regional de la Reunion
- Federation Nationale des Producteurs de Plants de Pomme de terre, Mission-DAR of the French Ministry of Food, Agriculture and Fisheries [7124]
- European Union
- Conseil Regional de la Reunion
- Federation Nationale des Producteurs de Plants de Pomme de terre, Mission-DAR of the French Ministry of Food, Agriculture and Fisheries [7124]
Ask authors/readers for more resources
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. The ISME Journal (2012) 6, 961-974; doi:10.1038/ismej.2011.160; published online 17 November 2011
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available