Journal of Integrative Agriculture ›› 2024, Vol. 23 ›› Issue (3): 781-794.DOI: 10.1016/j.jia.2023.11.003

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玉米籽粒发育过程中的大量矿质元素浓度动态变化与遗传调控

  

  • 收稿日期:2023-07-25 接受日期:2023-09-28 出版日期:2024-03-20 发布日期:2024-03-02

Dynamics and genetic regulation of macronutrient concentrations during grain development in maize

Pengcheng Li1, 2*, Shuangyi Yin1*, Yunyun Wang1*, Tianze Zhu1, Xinjie Zhu1, Minggang Ji1, Wenye Rui1, Houmiao Wang1, Chenwu Xu1, 2#, Zefeng Yang1, 2#   

  1. 1 Jiangsu Key Laboratory of Crop Genetics and Physiology/Key Laboratory of Plant Functional Genomics, Ministry of Education/Jiangsu Key Laboratory of Crop Genomics and Molecular Breeding/Agricultural College, Yangzhou University, Yangzhou 225009, China

    2 Jiangsu Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China

  • Received:2023-07-25 Accepted:2023-09-28 Online:2024-03-20 Published:2024-03-02
  • About author:#Correspondence Chenwu Xu, E-mail: qtls@yzu.edu.cn; Zefeng Yang, Tel: +86-514-87979358, Fax: +86-514-87996817, E-mail: zfyang@yzu.edu.cn * These authors contributed equally to this study.
  • Supported by:
    This work was supported by the Seed Industry Revitalization Project of Jiangsu Province, China (JBGS[2021]009), the National Natural Science Foundation of China (32061143030 and 31972487), the Jiangsu Province University Basic Science Research Project, China (21KJA210002), the Key Research and Development Program of Jiangsu Province, China (BE2022343), the Innovative Research Team of Universities in Jiangsu Province, China, the High-end Talent Project of Yangzhou University, China, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), China, and the Qing Lan Project of Jiangsu Province, China.

摘要:

氮、磷、钾是玉米生长发育所必需的大量矿质元素,对玉米产量和品质形成都至关重要。玉米籽粒灌浆过程中大量元素浓度的动态变化和积累的遗传基础仍不清楚。在本研究中,我们以DH1MT877杂交产生的206个重组自交系为材料,对授粉后6个时间点的籽粒氮、磷和钾浓度进行了测定,并计算不同时间区间内氮、磷和钾的净变化量。在重组自交系群体中,氮、磷和钾的浓度和净变化均观察到丰富的表型变异。数量性状位点(QTL)定位共发现了41QTL,其中氮、磷和钾浓度分别为有171614QTL。条件QTL定位发现了39QTL与氮、磷、钾浓度净变化相关。结合QTL、基因表达、共表达分析和比较基因组数据,我们分别鉴定出443644个候选基因与氮、磷和钾浓度相关,其中GRMZM2G371058与氮浓度相关,编码一个Dof转录因子,GRMZM2G113967与钾浓度相关,编码一个激酶蛋白CIPK。本文研究结果加深对玉米籽粒发育过程中氮、磷、钾积累的遗传机制的认识,为玉米养分浓度的遗传改良提供了有价值的候选基因。

Abstract:

Nitrogen (N), phosphorus (P), and potassium (K) are essential macronutrients that are crucial not only for maize growth and development, but also for crop yield and quality.  The genetic basis of macronutrient dynamics and accumulation during grain filling in maize remains largely unknown.  In this study, we evaluated grain N, P, and K concentrations in 206 recombinant inbred lines generated from a cross of DH1M and T877 at six time points after pollination.  We then calculated conditional phenotypic values at different time intervals to explore the dynamic characteristics of the N, P, and K concentrations.  Abundant phenotypic variations were observed in the concentrations and net changes of these nutrients.  Unconditional quantitative trait locus (QTL) mapping revealed 41 non-redundant QTLs, including 17, 16, and 14 for the N, P, and K concentrations, respectively.  Conditional QTL mapping uncovered 39 non-redundant QTLs related to net changes in the N, P, and K concentrations.  By combining QTL, gene expression, co-expression analysis, and comparative genomic data, we identified 44, 36, and 44 candidate genes for the N, P, and K concentrations, respectively, including GRMZM2G371058 encoding a Dof-type zinc finger DNA-binding family protein, which was associated with the N concentration, and GRMZM2G113967 encoding a CBL-interacting protein kinase, which was related to the K concentration.  The results deepen our understanding of the genetic factors controlling N, P, and K accumulation during maize grain development and provide valuable genes for the genetic improvement of nutrient concentrations in maize.

Key words: maize ,  nutrient concentration ,  unconditional QTL mapping ,  conditional QTL mapping ,  dynamic trait