Glancing at host adaptation in Ralstonia solanacearum through comparative genomics of highly host-adapted lineages

Ailloud Florent, Cellier Gilles, Roche David, Allen Caitilyn, Prior Philippe. 2013. Glancing at host adaptation in Ralstonia solanacearum through comparative genomics of highly host-adapted lineages. Phytopathology, 103 (6), suppl. S2 : S2.3. APS-MSA Conference, Austin, États-Unis, 10 Août 2013/14 Août 2013.

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Ralstonia solanacearum is a vascular soil-born plant pathogen with an unusually broad host range. This globally distributed, economically destructive organism has thousands of distinct lineages within a heterogeneous and taxonomically disputed species complex. Some of those lineages can be assigned to ecotypes that include highly host-adapted strains such as the banana Moko disease-causing strains, the cold-tolerant potato brown rot strains (R3bv2) and the recently emerged NPB strains (Not Pathogenic to Banana). The polyphyletic nature of the Moko ecotype and the unexpected closeness of some its lineages to the paraphyletic brown-rot and NPB ecotypes make those highly adapted strains a robust model for study of host adaptation and speciation in general. Genomes of 10 new strains were produced to complement the 12 publicly available ones. Using a panel of bioinformatics methods, we looked for genetic or evolutionary features that discriminate between ecotypes. There were relatively few divergent features. Those related to known virulence factors were further analysed for functional clues about host adaptation and ecotype emergence mechanisms. These analyses yield no clear signal, suggesting that the large biological differences between these closely related strains result from differences in gene expression rather than from differences in gene content. Transcriptomic analyses of these strains during host infection are underway to test this hypothesis. (Texte intégral)

Classification Agris : H20 - Maladies des plantes
P34 - Biologie du sol

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Ailloud Florent, CIRAD-BIOS-UMR PVBMT (REU)
• Cellier Gilles, ANSES-LSV (REU)
• Roche David, Institut de génomique (FRA)
• Allen Caitilyn, University of Wisconsin (USA)
• Prior Philippe, CIRAD-BIOS-UMR PVBMT (REU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/587408/)

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