Diversity of Ralstonia solanacearum in French Guiana Expands Knowledge of the "Emerging Ecotype"

Deberdt Peninna, Guyot Jean, Coranson Beaudu Régine, Launay Julie, Noreskal Manuella, Rivière Philippe, Vigné F., Laplace Damien, Lebreton Luc, Wicker Emmanuel. 2014. Diversity of Ralstonia solanacearum in French Guiana Expands Knowledge of the "Emerging Ecotype". Phytopathology, 104 (6) : 586-596.

Matériel d'accompagnement : 1 fichier complémentaire "Online material" (24 p.)

Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

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

Résumé : Although bacterial wilt remains a major plant disease throughout South America and the Caribbean, the diversity of prevalent Ralstonia solanacearum populations is largely unknown. The genetic and phenotypic diversity of R. solanacearum strains in French Guiana was assessed using diagnostic polymerase chain reactions and sequence-based (egl and mutS) genotyping on a 239-strain collection sampled on the families Solanaceae and Cucurbitaceae, revealing an unexpectedly high diversity. Strains were distributed within phylotypes I (46.9%), IIA (26.8%), and IIB (26.3%), with one new endoglucanase sequence type (egl ST) found within each group. Phylotype IIB strains consisted mostly (97%) of strains with the emerging ecotype (IIB/sequevar 4NPB). Host range of IIB/4NPB strains from French Guiana matched the original emerging reference strain from Martinique. They were virulent on cucumber; virulent and highly aggressive on tomato, including the resistant reference Hawaii 7996; and only controlled by eggplant SM6 and Surya accessions. The emerging ecotype IIB/4NPB is fully established in French Guiana in both cultivated fields and uncultivated forest, rendering the hypothesis of introduction via ornamental or banana cuttings unlikely. Thus, this ecotype may have originated from the Amazonian region and spread throughout the Caribbean region.

Mots-clés Agrovoc : Ralstonia solanacearum, écotype, variation génétique, distribution géographique, génétique des populations, recombinaison, phylogénie, Cucurbitaceae, Solanaceae

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés complémentaires : Flétrissement bactérien

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

• Deberdt Peninna, CIRAD-PERSYST-UPR HortSys (MTQ) ORCID: 0000-0001-9349-8335
• Guyot Jean, CIRAD-BIOS-UPR Bioagresseurs (GUF)
• Coranson Beaudu Régine, CIRAD-PERSYST-UPR HortSys (MTQ) ORCID: 0009-0004-1310-2118
• Launay Julie
• Noreskal Manuella
• Rivière Philippe
• Vigné F.
• Laplace Damien, DAAF (Guyane française) (GUF)
• Lebreton Luc, DAAF (Guyane française) (GUF)
• Wicker Emmanuel, CIRAD-BIOS-UMR PVBMT (REU) ORCID: 0000-0003-0927-7404

Source : Cirad - Agritrop (https://agritrop.cirad.fr/573302/)

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