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Precisely mapping a major QTL for grain weight on chromosome 5B of the founder parent Chuanmai42 in the wheat-growing region of southwestern China

文献类型： 外文期刊

作者： Ye, Meijin 1 ; Wan, Hongshen 2 ; Yang, Wuyun 2 ; Liu, Zehou 2 ; Wang, Qin 2 ; Yang, Ning 2 ; Long, Hai 4 ; Deng, Guangbing 4 ; Yang, Yumin 5 ; Feng, Hong 3 ; Zhou, Yonghong 1 ; Yang, Cairong 3 ; Li, Jun 2 ; Zhang, Haiqin 1 ;

作者机构： 1.Sichuan Agr Univ, Triticeae Res Inst, Chengdu 611130, Peoples R China

2.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China

3.Chengdu Normal Univ, Coll Chem & Life Sci, Chengdu 611130, Peoples R China

4.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Peoples R China

5.Sichuan Acad Agr Sci, Inst Agr Resources & Environm, Chengdu 610066, Peoples R China

6.Sichuan Agr Univ, State Key Lab Crop Gene Explorat & Utilizat Southw, Chengdu 611130, Peoples R China

7.Key Lab Wheat Biol & Genet Improvement Southwester, Chengdu 610066, Peoples R China

8.Environm Friendly Crop Germplasm Innovat & Genet I, Chengdu 610066, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.4； 五年影响因子：5.7 ）

ISSN： 0040-5752

年卷期： 2023 年 136 卷 6 期

页码：

收录情况： SCI

摘要： Key messageQTgw.saas-5B was validated as a major thousand-grain weight-related QTL in a founder parent used for wheat breeding and then precisely mapped to a 0.6 cM interval.Increasing the thousand-grain weight (TGW) is considered to be one of the most important ways to improve yield, which is a core objective among wheat breeders. Chuanmai42, which is a wheat cultivar with high TGW and a high and stable yield, is a parent of more than 30 new varieties grown in southwestern China. In this study, a Chuanmai42-derived recombinant inbred line (RIL) population was used to dissect the genetic basis of TGW. A major QTL (QTgw.saas-5B) mapped to the Xgwm213-Xgwm540 interval on chromosome 5B of Chuanmai42 explained up to 20% of the phenotypic variation. Using 71 recombinants with a recombination in the QTgw.saas-5B interval identified from a secondary RIL population comprising 1818 lines constructed by crossing the QTgw.saas-5B near-isogenic line with the recurrent parent Chuannong16, QTgw.saas-5B was delimited to a 0.6 cM interval, corresponding to a 21.83 Mb physical interval in the Chinese Spring genome. These findings provide the foundation for QTgw.saas-5B cloning and its use in molecular marker-assisted breeding.

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