QTL analysis of Cercospora leaf spot resistance in sugar beet

• Published in: Plant breeding Vol. 118; no. 4; pp. 327 - 334
• Main Authors: Nilsson, N.O, Hansen, M, Panagopoulos, A.H, Tuvesson, S, Ehlde, M, Christianson, M, Rading, I.M, Rissler, M, Kraft, T
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 01.09.1999; Blackwell
• Subjects: additive effect; AFLP; Agronomy. Soil science and plant productions; alleles; amplified fragment length polymorphism; Beta vulgaris; Beta vulgaris subsp. vulgaris; Biological and medical sciences; Cercospora beticola; chromosome mapping; composite interval mapping; disease resistance; dominance effects; Fundamental and applied biological sciences. Psychology; genetic effects; genetic markers; Genetics and breeding of economic plants; inheritance (genetics); leaf spotting; linkage groups; loci; marker-assisted breeding; Pest resistance; phenotypic variation; Plant pathogens; QTL; quantitative traits; restriction fragment length polymorphism; segregation; Varietal selection. Specialized plant breeding, plant breeding aims; Additivity; Genetic marker; Plant pathogen; Marker assisted selection; Beta vulgaris var. saccharata; Genetic determinism; Fungi; Dicotyledones; Linkage group; Angiospermae; Fungi Imperfecti; Locus; Thallophyta; Genetic mapping; Amplified fragment length polymorphism; Linkage; Cercospora beticola; Sugar plant; Fungus resistance; Chenopodiaceae; Quantitative trait loci; Allele; Sensitivity resistance; Restriction fragment length polymorphism; Genetic improvement; Phenotype variation; Spermatophyta
• ISSN: 0179-9541; 1439-0523
• DOI: 10.1046/j.1439-0523.1999.00390.x

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 204 individuals, using 221 AFLP and 46 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.