A high-density genetic map of hexaploid wheat (Triticum aestivum L.) from the cross Chinese Spring × SQ1 and its use to compare QTLs for grain yield across a range of environments

摘要: A population of 96 doubled haploid lines (DHLs) was prepared from F1 plants the hexaploid wheat cross Chinese Spring × SQ1 (a high abscisic acid-expressing breeding line) and mapped with 567 RFLP, AFLP, SSR, morphological biochemical markers covering all 21 chromosomes, a total map length 3,522 cM. Although lengths for each genome were very similar, D had only half other two genomes. The used to identify quantitative trait loci (QTLs) yield components combination 24 site treatment year combinations, including nutrient stress, drought stress salt treatments. QTLs widely distributed around genome, 17 clusters five or more trials identified: on group 1 one 2 3, 4, four 5, 6 three 7. strongest QTL effects chromosomes 7AL 7BL, due mainly variation in grain numbers per ear. Three largely site-specific, while associated coincident dwarfing gene Rht-B1 4BS vernalisation genes Vrn-A1 5AL Vrn-D1 5DL. Yields DHL calculated trial mean yields g plant−1 (equivalent about 8 t ha−1 2.5 ha−1, respectively), representing optimum moderately stressed conditions. Analyses these estimates using interval mapping confirmed group-7 and, at plant−1, identified additional major 1D 5A. Many corresponded already reported basis comparative genetics, also rice. implications results improving stability are discussed.