大麦重组自交系群体籽粒总花色苷含量和千粒重QTL定位

以云南特有的紫色大麦紫光芒裸二棱和澳大利亚引进的黄色大麦Schooner构建的193个重组自交系为材料,对2013—2015年3年3个试验点的大麦籽粒总花色苷含量和千粒重进行相关性分析和QTL定位。大麦总花色苷含量和千粒重之间呈显著或极显著负相关。共检测到12个总花色苷含量QTL,分别位于1H、2H、4H、6H和7H染色体,贡献率为5.06%～23.86%; 8个千粒重QTL,分别位于2H、4H和7H染色体,贡献率为4.67%～42.32%。贡献率大于10%的QTL有10个,大于20%的有5个,最大的可达42.32%。其中至少2年2点重复检测到2个总花色苷含量QTL,分别位于2H Bmag0125–GBM1309和7H EBmatc0016–Bmag0206区间,可分别解释表型变异的13.66%～17.76%和13.07%～16.43%;3年3点重复检测到2个千粒重QTL,分别位于2HScssr03381–scssr07759和7H GBM1297-GBM1303区间,可分别解释表型变异的4.67%～14.55%和34.51%～42.32%,其加性作用方向均一致。控制总花色苷含量与千粒...

QTL mapping for total grain anthocyanin content and 1000-kernel weight in barley recombinant inbred lines population

In this study, 193 recombinant inbred lines (RILs) derived from a cross between Ziguangmangluoerleng (purple barley, endemic to Yunnan, China) and Schooner (yellow barley introduced from Australia), grown at three sites of Yunnan province of China for three consecutive years (2013-2015), were used to determine total grain anthocyanin content, 1000-kernel weight and their correlations, and mapped QTLs. There was a significant negative correlation between total grain anthocyanin content and 1000-kernel weight. Twelve QTLs for total grain anthocyanin content were located on chromosomes 1H, 2H, 4H, 6H, and 7H which showed 5.06% to 23.86% of phenotypic variation. Eight QTLs for 1000-kernel weight were located on chromosomes 2H, 4H, and 7H, which explained phenotypic variation from 4.67% to 42.32%. Ten QTLs had phenotypic variation ≥10% and five QTLs ≥ 20%, while the highest phenotypic variation was 42.32%. In addition, two QTLs for total grain anthocyanin content were repeatedly detected at two sites for two years, and located on 2H Bmag0125 to GBM1309 and 7H EBmatc0016 to Bmag0206 interval, respectively, which accounted for 13.66% to 17.76%, and 13.07% to 16.43% of the phenotypic variation, respectively. Two QTLs for 1000-kernel weight were repeatedly detected at three sites for three years and located on 2H scssr03381 to scssr07759 and 7H GBM1297 to GBM1303 interval, which showed 4.67% to 14.55% and 34.51% to 42.32% of phenotypic variations, respectively, and their contribution rates of additive effects were consistent. The common major QTLs for two agronomic attributes were mainly distributed on chromosomes 2H and 7H. These results provide a basis for further fine mapping, cloning and marker-assisted breeding of beneficial genes related to total grain anthocyanin content and 1000-kernel weight.