Molecular mapping of quantitative trait loci for domestication traits and β-glucan content in a wheat recombinant inbred line population
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Genetic maps are useful for analysis of quantitative trait loci (QTLs) and for marker-assisted selection (MAS) in breeding. A simple sequence repeat (SSR) marker linkage map of common wheat was constructed based on recombination inbred lines (RILs) derived from a cross between Chinese Spring and spelt wheat. The map included 264 loci on all wheat chromosomes covering 2,345.2 cM with 962, 794.6, and 588.6 cM for the A, B, and D genomes, respectively. Using the RILs and the map, we detected 42 putative QTLs on 15 chromosomes for ear length, spikelet number, spike compactness, kernel length, kernel width, kernel height and β-glucan content. Each QTL explained 4–45% of the phenotypic variation. Five QTL cluster regions were detected on chromosomes 1A, 5AL, 2B, 2D, and 4D. The first QTLs for β-glucan content in wheat were identified on chromosomes 3A, 1B, 5B, and 6D.
KeywordsTriticum aestivum SSR Genetic linkage map QTL RIL
This study was supported by Grants-in-Aid for Scientific Research in priority areas “Comparative Genomics” and the National Bio-resource Project from the Ministry of Education, Culture, Sports, Science and Technology of Government of Japan.
This is contribution no. 1004 from the Kihara Institute for Biological Research, Yokohama City University.
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