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《Molecular Plant Breeding》 2018-06
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QTL Mapping of Agronomic Traits in Synthetic Hexaploid Wheat Based on DArTseq Marker

Cao Dong;Wang Hongxia;Zhang Bo;Liu Baolong;Liu Dengcai;Chen Wenjie;Zhang Huaigang;Qinghai Province Key Laboratory of Crop Molecular Breeding;University of Chinese Academy of Sciences;Key Laboratory of Adaptation and Evolution of Plateau Biota (AEPB), Chinese Academy of Sciences;Triticeae Research Institute,Sichuan Agricultural University;  
Synthetic hexaploid wheat(SHW) harbors abundant favorable genetic diversity, which can be utilized to common wheat improvement. In this study, two lines derived from synthetic hexaploid wheat were used to form F2 population, which contained 284 single plants. The genetic map was constructed based on 1 671 polymorphic DAr Tseq markers with chromosomal location information. Combined with the phenotype of agronomic traits(plant height(PHT), spike length(SL), uppermost internode length(UIL), spikelets(SPI), grain number per spike(GNS), panicle number per plant(PNP), thousand-grain weight(TGW), grain weight per plant(GWP)) of this population, the QTL positioning was carried out by using QTL mapping software ICIMapping 4.1. The results showedthat 20 QTLs were detected, including four QTLs for PHT, which were distributed on chromosomes 2 D, 3 B, 5 B;four QTLs associated with SL on the chromosomes 2 D, 3 B, 5 B; three QTLs controlling UIL on chromosomes 1 A and 5 A; two QTLs for GNS on chromosomes 3 D and 5 A; one QTL for PNP on chromosome 2 A; five QTLs for TGW on chromosomes 1 B, 5 A and 7 B; one QTL for GWP on chromosomes 7 B. These QTLs could explain5.4%~10.8%, 1.4%~8.8%, 4.6%~12.2%, 18.9%~29.8%, 10.2%, 8.9%~10.9%, 6.1% of the phenotypic variations,respectively. In addition, one QTL locus that controlled multiple traits existed on 5 B and 7 B chromosomes. One candidate gene closely related with TGW was gotten by using bioinformatics method. These results could lay a foundation for fine-mapping of agronomic traits, molecular marker assisted selection breeding and gene cloning in synthetic hexaploid wheat.
【Fund】: 中国科学院战略性A类先导科技专项子课题(XDA08030106)项目资助
【CateGory Index】: S512.1
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