QTL for capitulum resistance to Sclerotinia sclerotiorum in sunflower

Quantitative trait loci (QTL) for sunflower capitulum resistance to head rot (Sclerotinia sclerotiorum) were studied on a population of recombinant inbred lines (RIL), by infection at flowering with suspensions of ascospores. In addition, hybrids made between the RIL and 2 tester lines were observed under natural Sclerotinia attack in yield trials and under re-enforced Sclerotinia attack in trials made specially to observe disease reaction. The inbred lines were genotyped with RFLP and SSR markers which were mapped to give correspondence between different widely published maps and so permit comparison of QTL results in different sunflower populations. Two or three QTL were shown for each character, generally each representing only 8-15% of phenotypic variance. Mostly the same QTL were found for percent infection and latency index as in results for F3 families of the same population or other populations of F3 progenies or RIL. They were also observed in the hybrids, but the latter also showed significant QTL on other linkage groups.

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