QTL analysis of Cercospora leaf spot resistance in sugar beet |
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| Authors: | N.-O. Nilsson M. Hansen A. H. Panagopoulos S. Tuvesson M. Ehlde M. Christiansson I. M. Rading M. Rissler T. Kraft |
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| Affiliation: | Novartis Seeds AB, Box 302, S-261 23 Landskrona, Sweden;Department of Genetics, Lund University, Sölvegatan 29, S-223 62 Lund, Sweden |
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| Abstract: | The inheritance of Cercospora leaf spot resistance in sugar beet was investigated by means of quantitative trait loci (QTL) analysis of a segregating population of 193 individuals, using 110 AFLP and 35 restriction fragment length polymorphism (RFLP) markers. Five QTL were found through composite interval mapping on linkage groups 1, 2, 3, and 9, respectively, two of which were linked on linkage group 3. The significance of these QTL was tested by permutation analysis The QTL had mostly additive, but also certain negative dominance effects; all the resistance alleles came from the Cercospora-resistant parent. Each quantitative trait locus accounted for 7-18% of the phenotypic variation, leaving 37% of the variation unexplained. The results are discussed in relation to the potential use of marker-assisted breeding for Cercospora leaf spot resistance in sugar beet. |
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| Keywords: | Beta vulgaris Cercospora beticola AFLP marker-assisted breeding QTL |
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