The phenotypic variation caused by the QTL ranged from 48.3% to 79.3%.Īpart from the main trials, there were 2 sub-trials. A major QTL on chromosome 9 was found across locations and traits. Composite Interval Mapping was done in R package ‘R/qtl’ (Broman et al. A linkage map was constructed using JoinMap®5. The genotyping was done using the SolCAP 10K array provided by Illumina which contains 7720 SNP markers. Out of these, 6 populations were decided to repeat in the year 2017 for a better phenotyping and 1 population which showed a positive transgression (more resistant F2 individuals than both the parents) were chosen for further phenotyping and genotyping in the year 2017. 13 F2 populations resulted from these parents used in the year 2016 for screening for late blight. Organic Outdoor Tomato Project (Uni of Göttingen), Commercial hybrids and Exotic genotypes. These 7 parent genotypes were selected from 3 different groups a.k.a. The project started with 7 late blight resistant genotypes as using parents for initial crosses.

In addition, fungicide measures cannot be used when tomatoes are harvested for the fresh market leading to fungicide residues (Horneburg and Myers, 2012). LB control by cultural practices alone is insufficient (Chen et al. Late blight (LB) caused by Phytophthora infestans (Mont.) de Bary is a major cause of crop loss in tomato and potato around the globe (Foolad et al. Englisch Tomato (Lycopersicon esculentum) is the most widely grown vegetable food crop in the world.

Late blight tomatoe