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Tomato late blight caused by the oomycete pathogen  Phytophthora infestans  (Mont.) de Bary is a major threat to tomato production in cool and wet environments. Intensified outbreaks of late blight have been observed globally from the 1980s, and are associated with migration of new and more aggressive populations of  P. infestans  in the field. The objective of this study was to reassess late blight resistance in the wild tomato accession L3708 ( Solanum pimpinellifolium  L.) against pathogens of different aggressiveness. An F 2:3  genetic mapping population was developed using L3708 as the paternal parent. Two isolates of  P. infestans , Pi39A and Pi733, were used for inoculation. Pi733 is a highly aggressive genotype that defeats three known late blight resistance genes,  Ph-1 ,  Ph-2 , and  Ph-5t  in tomato. In contrast, Pi39A is a less aggressive genotype that defeats only  Ph-1 . Restriction site Associated DNA Sequencing (RAD-Seq) technology was used to massively sequence 90 bp nucleotides adjacent to both sides of  PstI  restriction enzyme cutting sites in the genome for all individuals in the genetic mapping population. The RAD-seq data were used to construct a genetic linkage map containing 440 single nucleotide polymorphism markers. Quantitative trait locus (QTL) analysis identified a new disease-resistant QTL specific to Pi733 on chromosome 2. The  Ph-3  gene located on chromosome 9 could be detected whichever isolates were used. This study demonstrated the feasibility and efficiency of RAD-Seq technology for conducting a QTL mapping experiment using an F 2:3  mapping population, which allowed the identification of a new late blight resistant QTL in tomato.

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Reassessment of QTLs for Late Blight Resistance in the Tomato Accession L3708 Using a Restriction Site Associated DNA (RAD) Linkage Map and Highly Aggressive Isolates of Phytophthora infestans