关键词: 野生二粒小麦, 硬粒小麦, 重组自交系, 穗部性状, 数量性状基因位点

Abstract: Wild emmer wheat, Triticum turgidum L. ssp. dicoccoides, is the progenitor of modern tetraploid and hexaploid cultivated wheats, whose genepool harbor a rich allelic repertoire for various traits.In this study, the genetic and phenotypic basis of spike traits, e.g.heading stage(HS), spike number per plant(SPP), kernel number per spike(KNS), spike length(SL), and awn length(AL) were analyzed in tetraploid wheat population consisting of 152 F6 recombinant inbreed lines(RILs) derived from a cross between T. dicoccoides(G18-16) and durum wheat cultivar(Langdon).Wide genetic variation was found among RILs for all studied traits.A total of 14 QTL effects associated with five spike traits were detected, with a LOD score range of ca.1.9 to 13.4, explaining phenotypic variation 7.3%~54.2%.The identified QTLs included:three QTLs for HS located on chromosomes 3A(2 QTLs) and 7B;three QTLs for KNS, located on chromosomes 2A(2 QTLs) and 5A;two QTLs for SPP, located on chromosome 5B(2 QTLs);three QTLs for SL, located chromosomes 5A(2 QTLs) and 7A;three QTLs for AL, located chromosomes 4B, 5A and 7A, respectively.The identified QTLs could be used to the future marker-assisted selection programs, facilitating the use of wild alleles for yield enhancement in elite wheat cultivars.

Key words: wild emmer wheat, durum wheat, recombinant inbred line, spike trait, quantitative trait locus