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Identification of QTLs for Ralstonia solanacearum race 3-phylotype II resistance in tomato

Abstract

Resistance against a Ralstonia solanacearum race 3-phylotype II strain JT516 was assessed in a F2:3 and a population of inbred lines (RIL), both derived from a cross between L. esculentum cv. Hawaii 7996 (partially resistant) and L. pimpinellifolium WVa700 (susceptible). Resistance criteria used were the percentage of wilted plants to calculate the AUDPC value, and bacterial colonization scores in roots and stem (hypocotyl and epicotyl) assessed in two independent greenhouse experiments conducted during the cool and hot seasons in Réunion Island, France. Symptoms were more severe during the cool season trials. Heritability estimates in individual seasons ranged from 0.82 to 0.88, depending on resistance criterion. A set of 76 molecular markers was used for quantitative trait loci (QTL) mapping using the single- and composite- interval mapping methods, as well as ANOVA. Four QTLs, named Bwr- followed by a number indicating their map location, were identified. They explained from 3.2 to 29.8% of the phenotypic variation, depending on the resistance criterion and the season. A major QTL, Bwr-6, and a minor one, Bwr-3, were detected in each season for all resistance criteria. Both QTLs showed stronger effects in the hot season than in the cool one. Their role in resistance to R. solanacearum race 3-phylotype II was subsequently confirmed in the RIL population derived from the same cross. Two other QTLs, Bwr-4 and Bwr-8, with intermediate and minor effects, respectively, were only detected in the hot season, demonstrating that environmental factors may strongly influence the expression of resistance against the race 3-phylotype II strain JT516. These QTLs were compared with those detected in the RIL population against race 1-phylotype I strain JT519 as well as those detected in other previous studies in the same genetic background against other race 1-phylotype I and II strains. This comparison revealed the possible occurrence of some phylotype-specific resistance QTLs in Hawaii 7996.

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Acknowledgments

The authors thank F. Chiroleu and J. Veslot (CIRAD Réunion) for help in statistical analyses, J.-J. Chéron (CIRAD Réunion) for technical assistance in the greenhouse trials, SCEA Bassin Plat for maintaining plant cuttings, and H. Kodja (Université Réunion) for his interest in this work. We also thank N. Grimsley (INRA Toulouse) and J-F. Wang (AVRDC Taiwan) for providing seeds of the mapping populations and the genotypic molecular data. This work was partially supported by funds from the Conseil Général of Réunion Island.

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Correspondence to P. Besse.

Additional information

Communicated by I. Paran

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Carmeille, A., Caranta, C., Dintinger, J. et al. Identification of QTLs for Ralstonia solanacearum race 3-phylotype II resistance in tomato. Theor Appl Genet 113, 110–121 (2006). https://doi.org/10.1007/s00122-006-0277-3

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Keywords

  • Quantitative Trait Locus
  • Quantitative Trait Locus Mapping
  • Composite Interval Mapping
  • Bacterial Wilt
  • Cool Season