中国农业科技导报 ›› 2024, Vol. 26 ›› Issue (11): 43-55.DOI: 10.13304/j.nykjdb.2024.0303

• 生物技术 生命科学 • 上一篇    下一篇

小麦淀粉合成关键基因TaAGPL1功能标记的开发

胡墨明1(), 孟琰珺1(), 苗淑媛1, 胡西宁1, 许晴1, 马红珍2, 王鹏飞1, 刘国芹1(), 康国章1()   

  1. 1.河南农业大学农学院,国家小麦工程技术研究中心,郑州 450046
    2.河南省驻马店市农业科学院,河南 驻马店 463000
  • 收稿日期:2024-04-16 接受日期:2024-06-04 出版日期:2024-11-15 发布日期:2024-11-19
  • 通讯作者: 刘国芹,康国章
  • 作者简介:胡墨明 E-mail: hu1747005837@163.com
    孟琰珺 E-mail: 17836955516@163.com第一联系人:胡墨明和孟琰珺为共同第一作者。
  • 基金资助:
    河南省重点研发与推广专项(222102110008);省部共建小麦玉米作物学国家重点实验室开放课题项目(SKL2023KF07)

Development of Functional Markers of the Key Gene TaAGPL1 in Wheat Starch Synthesis

Moming HU1(), Yanjun MENG1(), Shuyuan MIAO1, Xining HU1, Qing XU1, Hongzhen MA2, Pengfei WANG1, Guoqin LIU1(), Guozhang KANG1()   

  1. 1.National Engineering Research Center for Wheat,College of Agronomy,Henan Agricultural University,Zhengzhou 450046,China
    2.Zhumadian Agricultural Academy of Sciences,Henan Zhumadian 463000,China
  • Received:2024-04-16 Accepted:2024-06-04 Online:2024-11-15 Published:2024-11-19
  • Contact: Guoqin LIU,Guozhang KANG

摘要:

淀粉约占小麦籽粒干重的70%,是粒重的决定因子,TaAGPL1基因编码腺苷二磷酸葡萄糖焦磷酸化酶(AGPase)的胞质型大亚基,在小麦淀粉合成中发挥着关键作用。在近年来审定的239份小麦品种中,TaAGPL1基因序列中仅B拷贝上存在13个单核苷酸多态性位点(SNPs),根据序列多态性将小麦品种分成2种单倍型(Hap1和Hap2),将单倍型与千粒重进行相关分析发现,Hap2为优异单倍型;根据编码域1 944位点A/C碱基突变,开发了酶切扩增多态性序列(CAPS)功能标记;对Hap1和Hap2品种间TaAGPL1-1B基因转录水平和AGPase酶活性进行测定,发现它们在灌浆后14和21 d的Hap2小麦籽粒中均显著提高。研究结果为现代高淀粉含量或高千粒重小麦品种的筛选和创制提供理论基础和筛选依据。

关键词: 小麦, TaAGPL1, 淀粉, AGPase酶活性, 功能标记

Abstract:

Starch accounts for about 70% of wheat grain dry weight, and it is the determinant of grain weight. TaAGPL1 gene codes a large cytoplasmic subunit of adenosine diphosphate glucose pyrophosphorylase (AGPase) and plays a key role in wheat starch synthesis. From 239 modern wheat varieties approved in recent years, it was found that 13 single nucleotide polymorphism loci (SNPs) only existed on B copy of TaAGPL1 gene. After genome polymorphism analysis, they were classified into 2 haplotypes (Hap1 and Hap2). The correlation between haplotypes and thousand grain weight was analyzed, and Hap2 was proved to be the favoured haplotype. Based on the A/C mutation at allelic mutation site 1 944 in the encoding region, a functional marker was developed for enzyme restriction amplified polymorphic sequence (CAPS). The transcription level of TaAGPL1-1B gene and activity of AGPase between Hap1 and Hap2 varieties were measured and compared, and it was found that they were significantly increased in the grains of favoured haplotype Hap2 after grain-filling of 14 and 21 d. The research results provided theoretical basis for screening and creation of modern wheat varieties with high starch content or high thousand grain weight.

Key words: Triticum aestivum L., TaAGPL1, starch, AGPase activity, functional marker

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