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Fine mapping and candidate gene analysis of a major QTL for grain length on chromosome 5BS in bread wheat

文献类型： 外文期刊

作者： Zeng, Jianqi 1 ; Zhao, Dehui 1 ; Yang, Li 1 ; Yang, Yufeng 5 ; Liu, Dan 1 ; Tian, Yubing 1 ; Wang, Fengju 1 ; Cao, Shuanghe 1 ; Xia, Xianchun 1 ; He, Zhonghu 1 ; Zhang, Yong 1 ;

作者机构： 1.Chinese Acad Agr Sci CAAS, Inst Crop Sci, Natl Wheat Improvement Ctr, State Key Lab Crop Gene Resource & Breeding, Beijing 100081, Peoples R China

2.CAAS, Zhongyuan Res Ctr, Xinxiang 453519, Peoples R China

3.Henan Univ Sci & Technol, Coll Agron Tree Peony, Luoyang 471000, Peoples R China

4.Luoyang Acad Agr & Forestry Sci, Luoyang 471022, Peoples R China

5.Hebei Normal Univ, Coll Life Sci, Shijiazhuang 050024, Peoples R China

6.CAAS, CIMMYT China Off, Beijing 100081, Peoples R China

7.Suihuang Lab, Shangqiu 476000, Henan, Peoples R China

关键词： breeding-friendly marker; candidate gene prediction; fine mapping; grain length; Triticum aestivum L.

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：4.4； 五年影响因子：4.8 ）

ISSN： 2095-3119

年卷期： 2025 年 24 卷 7 期

页码：

收录情况： SCI

摘要： Large grain is a favorable trait for appearance quality and a large sink potential in wheat breeding. The stable QTL QGl.caas-5BS for grain length was previously identified in a recombinant inbred line population from the cross of Zhongmai 871 (ZM871) and its sister line Zhongmai 895 (ZM895). Here, a BC1F6 residual heterozygous line was selected from the cross of a ZM871/ZM895//ZM871 population, and six heterozygous recombinant plants were identified in the BC1F7 population from self-pollination of the heterozygous line. QGl.caas-5BS was delimited into an interval of approximately 2.2 Mb flanked by markers Kasp_5B33 and Kasp_5B2 (25.3-27.5 Mb) by phenotyping and genotyping the secondary mapping populations derived from these heterozygous recombinant plants. Five genes were predicted as candidates of QGl.caas-5BS based on sequence polymorphism and differential expression analyses. Further mutation analysis showed that TraesCS5B02G026800 is likely the causal gene of QGl.caas-5BS. The gene-specific marker Kasp_5B_Gl for TraesCS5B02G026800 was developed, and a significant genetic effect of QGl.caas-5BS on grain length was identified in a validation population of 166 cultivars using this marker. These findings lay a good foundation for map-based cloning of QGl.caas-5BS and provide a breeding-applicable marker for the improvement of grain length in wheat.

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