Polygenic Resistance of Tomato Plants to Bacterial Wilt in the French West Indies. Philippe Thoquet. Laboratoire de Biologie Moleculaire de Relations Plantes-Microorganismes, CNRS-INRA, B.P. 27 Auzeville, 31326 Castanet-Tolosan, France. Jocelyne Olivier, Christoph Sperisen, Peter Rogowsky, Philippe Prior, Guy Anais, Brigitte Mangin, Beatrice Bazin, Rana Nazer, and Nigel Grimsley Laboratoire de Biologie Moleculaire de Relations Plantes-Microorganismes, CNRS-INRA, B.P. 27 Auzeville, 31326 Castanet-Tolosan, France. MPMI 9:837-842. Accepted 4 September 1996. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1996.

Analysis of wilting symptoms using F₂ clones and F₃ families of plants derived from a cross between the resistant tomato cultivar Hawaii7996 and the susceptible Lycopersicon pimpinellifolium line WVa7OO inoculated with a strain of bacteria (GMI8217, derived from an endemic race 1 pathogen strain) permitted the detection of six quantitative trait loci (QTL) that may be important for field resistance to Ralstonia solanacearum. Three QTL, one on chromosome 6 and two QTL on chromosome 4, confirmed results previously obtained in tests done in a culture chamber (P. Thoquet, J. Olivier, C. Sperisen, P. Rogowsky, H. Laterrot, and N. Grimsley, MPMI 9:826-836, 1996). Two putative new QTL were found on chromosomes 3 and 8. In addition, a weak putative QTL previously detected on chromosome 10 was again observed in the field. One QTL on chromosome 11 was found to be specific to F₂ clones.