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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

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Abstract

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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.

Abstract

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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Acknowledgements

We thank Dr. Yu Lin (Sichuan Agricultural University) for helping to revise the manuscript.

Funding

This study was partially supported by the National Key Research and Development Program (2021YFD1200600), the National Natural Science Foundation of China (31870309), the Program of Chinese Agriculture Research System (CARS-03), the Science and Technology Department of Sichuan Province (2023NSFSC1925, 2022NSFSC0161, 2021YFYZ0020, and 2021YFYZ0002), the Sichuan Provincial Finance Department (2019QYXK034, 2022ZZCX006, 1 + 9KJGG001, and the Accurate Identification of Crop Germplasm Project), and the Research Project of Chengdu Normal University (CS22XMPY0109).

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  1. Meijin Ye and Hongshen Wan have contributed equally.

Authors and Affiliations

  1. Triticeae Research Institute, Sichuan Agricultural University, Chengdu, 611130, China

    Meijin Ye, Yonghong Zhou & Haiqin Zhang

  2. Crop Research Institute, Sichuan Academy of Agricultural Sciences, Chengdu, 610066, China

    Hongshen Wan, Wuyun Yang, Zehou Liu, Qin Wang, Ning Yang & Jun Li

  3. College of Chemistry and Life Sciences, Chengdu Normal University, Chengdu, 611130, China

    Meijin Ye, Hong Feng & Cairong Yang

  4. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China

    Hai Long & Guangbing Deng

  5. Institute of Agricultural Resources and Environment, Sichuan Academy of Agricultural Sciences, Chengdu, 610066, China

    Yumin Yang

  6. State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Sichuan Agricultural University, Chengdu, 611130, China

    Yonghong Zhou & Haiqin Zhang

  7. Key Laboratory of Wheat Biology and Genetic Improvement on Southwestern China (MARA), Chengdu, 610066, China

    Meijin Ye, Hongshen Wan, Wuyun Yang, Zehou Liu, Qin Wang, Ning Yang & Jun Li

  8. Environment-Friendly Crop Germplasm Innovation and Genetic Improvement Key Laboratory of Sichuan Province, Chengdu, 610066, China

    Hongshen Wan, Wuyun Yang, Zehou Liu, Qin Wang & Jun Li

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  1. Meijin Ye
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  2. Hongshen Wan
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Contributions

MY and HW analyzed the data and drafted the manuscript. ZL analyzed the phenotypes and related data with assistance from QW, NY, HL, GD, YY, HF, and CY. JL, WY, and HZ constructed the NILs. WY and YZ helped design the study. WY, HW, JL, and HZ designed the study and revised the manuscript. All of the authors have read and approved the final version of the manuscript.

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Correspondence to Jun Li or Haiqin Zhang.

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Ye, M., Wan, H., Yang, W. et al. Precisely mapping a major QTL for grain weight on chromosome 5B of the founder parent Chuanmai42 in the wheat-growing region of southwestern China. Theor Appl Genet 136, 146 (2023). https://doi.org/10.1007/s00122-023-04383-1

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