Data from: Mapping resistance to Alternaria cucumerina in Cucumis melo

Infection with Alternaria cucumerina causes Alternaria leaf blight (ALB), a disease characterized by lesion formation on leaves, leading to substantial yield and quality losses in Cucumis melo (melon). While fungicides are effective against ALB, reduction in the frequency of application would be economically and environmentally beneficial. Resistant melon lines have been identified but the genetic basis of this resistance has not been determined. A saturated melon genetic map was constructed with markers developed through genotyping-by sequencing of an MR-1 (resistant) by Ananas Yokneum (susceptible Israeli cultivar) a recombinant inbred line (RIL) population (F6-F10; N=82) derived from single seed descent of a F2 population from a cross between the ALB resistant parent MR-1 and the ALB susceptible parent Ananas Yokneum. The population was evaluated for A. cucumerina resistance with an augmented block greenhouse study using inoculation with the wounded-leaf method. Multiple quantitative trait loci (QTL) mapping identified two QTL that explained 33.9% of variation in lesion area. Several candidate genes within range of these QTL were identified using the C. melo v3.5 genome. Markers linked to these QTL will be used to accelerate efforts to breed melon cultivars resistant to ALB.,TableD1Phenotypic data the Cucumis melo MR-1 × AY RIL population, including Alternaria cucumerina lesion area and lesion area BLUPs.TableD2Genotypes for the Cucumis melo MR-1 × AY RIL population at the 2,200 SNPs used for map construction and quantitative trait loci detection.TableD3Physical and genetic positions of the 2,200 SNPs used for map construction and quantitative trait loci detection in Cucumis melo.TableD4Genes located within the 1.5-LOD interval of qALB-10 or qALB-12.TableD5List of candidate genes prioritized by functional relevance.