Genetic mapping of a major dominant gene for resistance to Ralstonia solanacearum in eggplant

Lebeau Aurore, Gouy Matthieu, Daunay Marie-Christine, Wicker Emmanuel, Chiroleu Frédéric, Prior Philippe, Frary Anne, Dintinger Jacques. 2013. Genetic mapping of a major dominant gene for resistance to Ralstonia solanacearum in eggplant. Theoretical and Applied Genetics, 126 (1) : 143-158.

https://doi.org/10.1007/s00122-012-1969-5

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Quartile : Q1, Sujet : HORTICULTURE / Quartile : Q1, Sujet : AGRONOMY / Quartile : Q1, Sujet : PLANT SCIENCES / Quartile : Q2, Sujet : GENETICS & HEREDITY

Résumé : Resistance of eggplant against Ralstonia solanacearum phylotype I strains was assessed in a F6 population of recombinant inbred lines (RILs) derived from a intra-specific cross between S. melongena MM738 (susceptible) and AG91-25 (resistant). Resistance traits were determined as disease score, percentage of wilted plants, and stem-based bacterial colonization index, as assessed in greenhouse experiments conducted in Re´union Island, France. The AG91-25 resistance was highly efficient toward strains CMR134, PSS366 and GMI1000, but only partial toward the highly virulent strain PSS4. The partial resistance found against PSS4 was overcome under high inoculation pressure, with heritability estimates from 0.28 to 0.53, depending on the traits and season. A genetic map was built with 119 AFLP, SSR and SRAP markers positioned on 18 linkage groups (LG), for a total length of 884 cM, and used for quantitative trait loci (QTL) analysis. A major dominant gene, named ERs1, controlled the resistance to strains CMR134, PSS366, and GMI1000. Against strain PSS4, this gene was not detected, but a significant QTL involved in delay of disease progress was detected on another LG. The possible use of the major resistance gene ERs1 in marker-assisted selection and the prospects offered for academic studies of a possible gene for gene system controlling resistance to bacterial wilt in solanaceous plants are discussed.

Mots-clés Agrovoc : Ralstonia solanacearum, Solanum melongena, résistance aux maladies, résistance génétique, carte génétique, gène dominant, locus des caractères quantitatifs, marqueur génétique

Mots-clés géographiques Agrovoc : La Réunion, France

Mots-clés complémentaires : Flétrissement bactérien, QTL

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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