Precisely Mapping a Major QTL for Grain Weight on Chromosome 5B of the Founder Parent Chuanmai42 in the Wheat-growing Region of Southwestern China

Overview

Journal Theor Appl Genet

Publisher Springer

Specialty Genetics

Date 2023 May 31

PMID 37258797

Authors

Meijin Ye

Hongshen Wan

Wuyun Yang

Zehou Liu

Qin Wang

Ning Yang

Hai Long

Guangbing Deng

Yumin Yang

Hong Feng

Yonghong Zhou

Cairong Yang

Jun Li

Haiqin Zhang

Affiliations

Soon will be listed here.

Abstract

QTgw.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.

Citing Articles

Identification and validation of major-effect quantitative trait locus QMS-5B associated with male sterility in photo-thermo-sensitive genic male sterile wheat.

Niu F, Liu Z, Zhang F, Yuan S, Bai J, Liu Y Theor Appl Genet. 2023; 136(12):257.

PMID: 38015285 DOI: 10.1007/s00122-023-04500-0.

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