Three QTLs for <Emphasis Type="Italic">Botrytis cinerea</Emphasis> resistance in tomato |
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Authors: | Richard Finkers Petra van den Berg Ralph van Berloo Arjen ten Have Adriaan W van Heusden Jan A L van Kan Pim Lindhout |
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Institution: | (1) Graduate school Experimental Plant Sciences, Laboratory of Plant Breeding, Wageningen University, PO box 386, 6700 AJ Wageningen, The Netherlands;(2) Laboratory of Phytopathology, Wageningen University, PO box 8025, 6700 EE Wageningen, The Netherlands;(3) Present address: Instituto de Investigaciones Biologicas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, cc 1245 (7600), Mar del Plata, Argentina;(4) Present address: De Ruiter Seeds, Leeuwenhoekweg 52, Bergschenhoek, The Netherlands |
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Abstract: | Tomato (Solanum lycopersicum) is susceptible to grey mold (Botrytis cinerea). Partial resistance to this fungus was identified in accessions of wild relatives of tomato such as S. habrochaites LYC4. In order to identify loci involved in quantitative resistance (QTLs) to B. cinerea, a population of 174 F2 plants was made originating from a cross between S. lycopersicum cv. Moneymaker and S. habrochaites LYC4. The population was genotyped and tested for susceptibility to grey mold using a stem bioassay. Rbcq1, a QTL reducing lesion growth (LG) and Rbcq2, a QTL reducing disease incidence (DI) were identified. Rbcq1 is located on Chromosome 1 and explained 12% of the total phenotypic variation while Rbcq2 is located on Chromosome 2 and explained 15% of the total phenotypic variation. Both QTL effects were confirmed by assessing
disease resistance in two BC2S1 progenies segregating for either of the two QTLs. One additional QTL, Rbcq4 on Chromosome 4 reducing DI, was identified in one of the BC2S1 progenies. F2 individuals, homozygous for the Rbcq2 and Rbcq4 alleles of S. habrochaites showed a reduction of DI by 48%. QTLs from S. habrochaites LYC4 offer good perspectives for breeding B. cinerea resistant tomato cultivars.
Electronic supplementary material Supplementary material is available in the online version of this article at and is accessible for authorized users. |
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