Bacterial wilt resistance in Tomato, Pepper, and Eggplant : genetic resources respond to diverse strains in the Ralstonia solanacearum species complex

Lebeau Aurore, Daunay Marie-Christine, Frary Anne, Palloix Alain, Wang Jaw-Fen, Dintinger Jacques, Chiroleu Frédéric, Wicker Emmanuel, Prior Philippe. 2011. Bacterial wilt resistance in Tomato, Pepper, and Eggplant : genetic resources respond to diverse strains in the Ralstonia solanacearum species complex. Phytopathology, 101 (1) : 154-165.

https://doi.org/10.1094/PHYTO-02-10-0048

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Quartile : Q1, Sujet : PLANT SCIENCES

Liste HCERES des revues (en SHS) : oui

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

Résumé : Bacterial wilt, caused by strains belonging to the #Ralstonia solanacearum# species complex, inflicts severe economic losses in many crops worldwide. Host resistance remains the most effective control strategy against this disease. However, wilt resistance is often overcome due to the considerable variation among pathogen strains. To help breeders circumvent this problem, we assembled a worldwide collection of 30 accessions of tomato, eggplant and pepper (Core-TEP), most of which are commonly used as sources of resistance to #R. solanacearum# or for mapping quantitative trait loci. The Core-TEP lines were challenged with a core collection of 12 pathogen strains (Core-Rs2) representing the phylogenetic diversity of #R. solanacearum#. We observed six interaction phenotypes, from highly susceptible to highly resistant. Intermediate phenotypes resulted from the plants' ability to tolerate latent infections (i.e., bacterial colonization of vascular elements with limited or no wilting). The Core- Rs2 strains partitioned into three pathotypes on pepper accessions, five on tomato, and six on eggplant. A "pathoprofile" concept was developed to characterize the strain clusters, which displayed six virulence patterns on the whole set of Core-TEP host accessions. Neither pathotypes nor pathoprofiles were phylotype specific. Pathoprofiles with high aggressiveness were mainly found in strains from phylotypes I, IIB, and III. One pathoprofile included a strain that overcame almost all resistance sources.

Mots-clés Agrovoc : Ralstonia solanacearum, Solanum lycopersicum, Capsicum annuum, Solanum melongena

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés complémentaires : Flétrissement bactérien

Classification Agris : F30 - Génétique et amélioration des plantes
H20 - Maladies des plantes

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

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