A major quantitative trait locus for resistance to Turnip Yellows Virus (TuYV, syn. beet western yellows virus, BWYV) in rapeseed

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Abstract
Turnip yellows virus (TuYV) is responsible for a recognizable loss of yield in European winter oilseed rape cultivation. To map genes involved in TuYV resistance, a double haploid population was established by crossing a resynthesized rapeseed line (R54) as donor for TuYV resistance with an elite rapeseed line (‘Express’). Resistance was determined with 10 plants per line by double antibody sandwich‐enzyme‐linked immunosorbent assay. After screening 17 primer combinations (Pstl/Msel and EcoRI/Msel), 143 amplified fragment length polymorphism markers were mapped to 20 linkage groups representing 15 chromosomes of the rapeseed genome. Quantitative trait loci (QTL) were mapped using the composite interval mapping approach. As a result, one major quantitative trait locus was found on linkage group MS17, explaining up to 50% of the phenotypic variation. Because no other factors displaying a significant effect on the expression of resistance could be identified, a simple mode of inheritance for TuYV resistance is suggested, thus enabling marker‐assisted selection during rapeseed breeding.