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Dissection of genetic factors underlying grain size and fine mapping of QTgw.cau-7D in common wheat (Triticum aestivum L.)

文献类型： 外文期刊

作者： Chen, Zhaoyan 1 ; Cheng, Xuejiao 1 ; Chai, Lingling 1 ; Wang, Zhihui 1 ; Bian, Ruolin 1 ; Li, Jiang 1 ; Zhao, Aiju 3 ; Xi 1 ;

作者机构： 1.China Agr Univ, State Key Lab Agrobiotechnol, Key Lab Crop Heterosis & Utilizat MOE, Key Lab Crop Genet Improvement, Beijing 100193, Peoples R China

2.Natl Plant Gene Res Ctr, Beijing 100193, Peoples R China

3.Hebei Acad Agr & Forestry Sci, Hebei Crop Genet Breeding Lab, Inst Cereal & Oil Crops, Shijiazhuang 050035, Hebei, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）

ISSN： 0040-5752

年卷期： 2020 年 133 卷 1 期

页码：

收录情况： SCI

摘要： Key message Thirty environmentally stable QTL controlling grain size and/or plant height were identified, among which QTgw.cau-7D was delimited into the physical interval of approximately 4.4 Mb. Grain size and plant height (PHT) are important agronomic traits in wheat breeding. To dissect the genetic basis of these traits, we conducted a quantitative trait locus (QTL) analysis using recombinant inbred lines (RILs). In total, 30 environmentally stable QTL for thousand grain weight (TGW), grain length (GL), grain width (GW) and PHT were detected. Notably, one major pleiotropic QTL on chromosome arm 3DS explained the highest phenotypic variance for TGW, GL and PHT, and two stable QTL (QGw.cau-4B and QGw.cau-7D) on chromosome arms 4BS and 7DS contributed greater effects for GW. Furthermore, the stable QTL controlling grain size (QTgw.cau-7D and QGw.cau-7D) were delimited into the physical interval of approximately 4.4 Mb harboring 56 annotated genes. The elite NILs of QTgw.cau-7D increased TGW by 12.79-21.75% and GW by 4.10-8.47% across all three environments. Collectively, these results provide further insight into the genetic basis of TGW, GL, GW and PHT, and the fine-mapped QTgw.cau-7D will be an attractive target for positional cloning and marker-assisted selection in wheat breeding programs.

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