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植物研究 ›› 2022, Vol. 42 ›› Issue (2): 234-242.doi: 10.7525/j.issn.1673-5102.2022.02.008

• 分子生物学 • 上一篇    下一篇

胡杨PeNAC121基因启动子的分离鉴定和胁迫应答模式分析

谢望, 李天静, 李鑫窈, 杨丰铭, 姚银安, 高永峰()   

  1. 西南科技大学生命科学与工程学院,绵阳 621010
  • 收稿日期:2021-03-04 出版日期:2022-03-20 发布日期:2022-02-22
  • 通讯作者: 高永峰 E-mail:gaoyongfeng0263@gmail.com
  • 作者简介:谢望(1995—)女,硕士研究生,主要从事树木抗逆和遗传改良。
  • 基金资助:
    国家自然科学基金面上项目(31770644);四川省教育厅资助科研项目(17ZB0456);西南科技大学博士基金项目(14zx7157);西南科技大学大学生创新基金项目(CX20-041)

Identification of PeNAC121 Gene Promoter and Stress Response Pattern Analysis in Populus euphratica

Wang Xie, Tianjing Li, Xinyao Li, Fenming Yang, Yin’an Yan, Yongfeng Gao()   

  1. School of Life Science and Engineering Southwest University of Science and Technology,Mianyang 621010
  • Received:2021-03-04 Online:2022-03-20 Published:2022-02-22
  • Contact: Yongfeng Gao E-mail:gaoyongfeng0263@gmail.com
  • About author:Xie Wang(1995—),female,master,mainly engaged in tree resilience and genetic improvement.
  • Supported by:
    Foundation item the National Natural Science Foundation of China(31770644);Scientific Research Fund of the Education Department of Sichuan(17ZB0456);Doctoral Scientific Fun of Southwest University of Science and Technology(14zx7157);College students’ innovation fund of Southwest University of Science and Technology(CX20-041)

摘要:

为了探究NAC转录因子家族成员在胡杨(Populus euphratica)逆境胁迫中的响应和调控机制,利用PCR技术从胡杨中克隆了PeNAC121基因的启动子序列,并采用生物信息学工具对该启动子的结构特征进行了分析,最后利用该启动子驱动GUS报告基因在三倍体毛白杨(Populus tomentosa)中表达,并对获得的转基因植株采用不同胁迫处理后进行了GUS染色和酶活性定量分析。结果表明,克隆获得的PeNAC121基因的启动子长度为1 997 bp(起始密码子ATG上游),启动序列中除了含有大量的光响应元件,还含有多个与非生物逆境胁迫和激素响应相关的元件,如低温响应元件LTR、干旱响应元件MBS、防卫和胁迫响应元件TC-rich repeats、脱落酸(ABA)响应元件、以及赤霉素(GA)响应元件等。基因的组织表达模式检测结果显示,PeNAC121基因主要在茎中表达,在根和叶中的表达较少。GUS组织化学染色和酶活性检测结果表明,胡杨PeNAC121启动子显著受到NaCl、甘露醇、ABA和4 ℃低温的诱导表达。由上述结果推测PeNAC121基因与胡杨的逆境胁迫应答密切相关,表明该基因的启动子是一个能够应答多种逆境胁迫的诱导型启动子。本研究为阐明PeNAC121基因在胡杨逆境响应和调控中的作用机制提供理论参考。

关键词: 胡杨, PeNAC121启动子, 逆境响应, 诱导型启动子

Abstract:

To explore the stress response and regulatory mechanism of NAC transcription factor family members in Populus euphratica, the promoter sequence of PeNAC121 gene was cloned from leaves of Populus euphrachiae by PCR and its structural characteristics were analyzed using bioinformatics tools. The PeNAC121 promoter was used to drive the expression of the GUS reporter gene in the triploid Populus tomentosa, and then GUS staining and enzyme activity quantitative analysis were performed in the obtained transgenic plants after different stress treatments. The cloned promoter sequence of PeNAC121 gene was 1 997 bp(located in the upstream of start codon ATG) in length, included a large number of light-responsive elements, and also contained a number of abiotic stress and phytohormone responsive elements, such as low temperature response element LTR, drought response element MBS, abscisic acid(ABA) response element, as well as gibberellin(GA) response elements, respectively. The result of tissue expression pattern showed that the PeNAC121 gene was mainly expressed in stemsof P. euphratica, with low expression in roots and leaves. The results of GUS histochemical staining and enzyme activity test of transgenic plants showed that the PeNAC121 promoter was significantly induced by NaCl, mannitol, ABA and 4 ℃ low temperature respectively. It was speculated from the above results that PeNAC121 gene was closely related to the response to stress. The results showed that the promoter of PeNAC121 gene was an inducible promoter responding to multiple stresses. The study provid a theoretical reference for elucidating the role of PeNAC121 gene in stress response and regulation of P. euphratica.

Key words: Populus euphratica, PeNAC121 promoter, stress response, inducible promoter

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