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Genotyping by sequencing highlights a polygenic resistance to Ralstonia pseudosolanacearum in eggplant (Solanum melongena L.)

Salgon Sylvia, Raynal Morgane, Lebon Sylvain, Baptiste Jean-Michel, Daunay Marie-Christine, Dintinger Jacques, Jourda Cyril. 2018. Genotyping by sequencing highlights a polygenic resistance to Ralstonia pseudosolanacearum in eggplant (Solanum melongena L.). International Journal of Molecular Sciences, 19 (2):357, 24 p.

Journal article ; Article de recherche ; Article de revue à facteur d'impact Revue en libre accès total
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Quartile : Q2, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY / Quartile : Q2, Sujet : CHEMISTRY, MULTIDISCIPLINARY

Abstract : Eggplant cultivation is limited by numerous diseases, including the devastating bacterial wilt (BW) caused by the Ralstonia solanacearum species complex (RSSC). Within the RSSC, Ralstonia pseudosolanacearum (including phylotypes I and III) causes severe damage to all solanaceous crops, including eggplant. Therefore, the creation of cultivars resistant to R. pseudosolanacearum strains is a major goal for breeders. An intraspecific eggplant population, segregating for resistance, was created from the cross between the susceptible MM738 and the resistant EG203 lines. The population of 123 doubled haploid lines was challenged with two strains belonging to phylotypes I (PSS4) and III (R3598), which both bypass the published EBWR9 BW-resistance quantitative trait locus (QTL). Ten and three QTLs of resistance to PSS4 and to R3598, respectively, were detected and mapped. All were strongly influenced by environmental conditions. The most stable QTLs were found on chromosomes 3 and 6. Given their estimated physical position, these newly detected QTLs are putatively syntenic with BW-resistance QTLs in tomato. In particular, the QTLs' position on chromosome 6 overlaps with that of the major broad-spectrum tomato resistance QTL Bwr-6. The present study is a first step towards understanding the complex polygenic system, which underlies the high level of BW resistance of the EG203 line.

Mots-clés libres : Solanum melongena, Doubled haploid population, Bacterial wilt, Quantitative trait locus (QTL) mapping, Polygenic resistance

Classification Agris : F30 - Plant genetics and breeding
H20 - Plant diseases
H50 - Miscellaneous plant disorders

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

Auteurs et affiliations

  • Salgon Sylvia, CIRAD-BIOS-UMR PVBMT (REU) - auteur correspondant
  • Raynal Morgane, Nova Genetic (FRA)
  • Lebon Sylvain, CIRAD-BIOS-UMR PVBMT (REU)
  • Baptiste Jean-Michel, CIRAD-BIOS-UMR PVBMT (REU)
  • Daunay Marie-Christine, INRA (FRA)
  • Dintinger Jacques, CIRAD-BIOS-UMR PVBMT (REU)
  • Jourda Cyril, CIRAD-BIOS-UMR PVBMT (REU)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/591201/)

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