Quantitative resistance to Botrytis cinerea from Solanum neorickii

• Published in: Euphytica 2008, Vol.159 (1-2), p.83-92
• Main Authors: Finkers, Richard, Bai, Yuling, van den Berg, Petra, van Berloo, Ralph, Meijer-Dekens, Fien, ten Have, Arjen, van Kan, Jan, Lindhout, Pim, van Heusden, Adriaan W
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Bioassays; Biological and medical sciences; Biomedical and Life Sciences; Biotechnology; Botrytis cinerea; Crop diseases; Disease resistance; Fundamental and applied biological sciences. Psychology; fungal diseases of plants; Gene mapping; Genetic markers; Genetics and breeding of economic plants; gray mold; Life Sciences; Lycopersicon esculentum; Mold; Plant Genetics and Genomics; Plant Pathology; Plant Physiology; Plant resistance; Plant Sciences; quantitative trait loci; Solanum; Solanum lycopersicum var. lycopersicum; Solanum neorickii; stems; Tomatoes; Varietal selection. Specialized plant breeding, plant breeding aims; wild relatives
• ISSN: 0014-2336; 1573-5060
• DOI: 10.1007/s10681-007-9460-0

Tomato (Solanum lycopersicum) is susceptible to gray mold (Botrytis cinerea). Quantitative resistance to B. cinerea was previously identified in a wild relative, S. neorickii G1.1601. The 122 F₃ families derived from a cross between the susceptible S. lycopersicum cv. Moneymaker and the partially resistant S. neorickii G1.1601 were tested for susceptibility to B. cinerea using a stem bioassay. Three putative quantitative trait loci (pQTL) were detected: pQTL3 and pQTL9 reducing lesion growth (LG) and pQTL4 reducing disease incidence (DI). For each pQTL, a putative homologous locus was identified recently in another wild tomato relative, S. habrochaites LYC4. pQTL3 was confirmed by assessing disease resistance in BC₃S₁ and BC₃S₂ progenies of S. neorickii G1.1601. pQTL4 was not statistically confirmed but the presence of the S. neorickii resistance allele reduced DI in all three tested populations. The reduction in LG of pQTL9 was not confirmed but rather, this locus conferred a reduced DI, similar to observations in the QTL study using S. habrochaites. The results are discussed in relation to other disease resistance loci identified in studies with other wild tomato relatives.