生物技术通报 ›› 2024, Vol. 40 ›› Issue (4): 148-158.doi: 10.13560/j.cnki.biotech.bull.1985.2023-1045

• 研究报告 • 上一篇    下一篇

盐胁迫下辣椒CaPIF4的表达特性与功能分析

李慧1(), 文钰芳1, 王悦1, 纪超1, 石国优1, 罗英2, 周勇1, 李志敏1, 吴晓玉1, 杨有新2(), 刘建萍1()   

  1. 1.江西农业大学生物科学与工程学院 江西省农业微生物资源开发与利用工程实验室,南昌 330045
    2.江西农业大学农学院 江西省果蔬保鲜与无损检测重点实验室,南昌 330045
  • 收稿日期:2023-11-07 出版日期:2024-04-26 发布日期:2024-04-30
  • 通讯作者: 刘建萍,女,博士,副教授,研究方向:植物分子生物学;E-mail: JianpingLiu@jxau.edu.cn
    杨有新,男,博士,教授,研究方向:设施园艺;E-mail: yangyouxin@jxau.edu.cn
  • 作者简介:李慧,女,硕士研究生,研究方向:植物分子生物学;E-mail: lh15736630394@163.com
    第一联系人:

    文钰芳为本文共同第一作者

  • 基金资助:
    江西省主要学科学术和技术带头人培养计划,青年人才项目(20204BCJL23044);国家自然科学基金项目(32060047);江西省自然科学基金面上项目(20232BAB205041);赣鄱俊才支持计划,高层次和急需紧缺海外人才引进项目(20232BCJ25068)

Expression Characteristics and Functions of CaPIF4 in Capsicum annuum Under Salt Stress

LI Hui1(), WEN Yu-fang1, WANG Yue1, JI Chao1, SHI Guo-you1, LUO Ying2, ZHOU Yong1, LI Zhi-min1, WU Xiao-yu1, YANG You-xin2(), LIU Jian-ping1()   

  1. 1. College of Bioscience and Bioengineering, Jiangxi Agricultural University, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Nanchang 330045
    2. College of Agronomy, Jiangxi Agricultural University, Jiangxi Key Laboratory for Postharvest Technology and Nondestructive Testing of Fruits & Vegetables, Nanchang 330045
  • Received:2023-11-07 Published:2024-04-26 Online:2024-04-30

摘要:

目的】研究辣椒光敏色素互作因子4(phytochrome-interacting factor 4, PIF4)响应盐胁迫的分子机制,为探究辣椒响应盐胁迫的分子机理和选育耐盐品种提供理论基础。【方法】以‘Zunla-1’cDNA为模板克隆CaPIF4,利用生物信息软件分析该基因所编码蛋白的理化性质,实时荧光定量PCR(RT-qPCR)技术和病毒诱导基因沉默(virus induced gene silencing, VIGS)技术研究盐胁迫处理后CaPIF4表达模式及在盐胁迫中的作用。【结果CaPIF4在辣椒根、茎、叶、花和果实各组织均有表达,但在叶片中表达水平最高;随着300 mmol/L NaCl处理时间的增加,CaPIF4表达量升高,其中,在处理2 h后表达量达到最高;利用VIGS技术沉默CaPIF4,将对照组(CK)和基因瞬时沉默组(pTRV-CaPIF4)进行300 mmol/L NaCl处理后发现,基因沉默组植株与空载组(CK)相比,萎蔫程度更为严重,说明基因瞬时沉默组(pTRV-CaPIF4)植株耐盐性降低;亚细胞定位结果显示,CaPIF4定位于细胞核;酵母转录活性分析发现CaPIF4具有转录激活活性。高盐胁迫下,辣椒叶片过氧化氢含量升高,过氧化物酶活性升高。染色结果显示,沉默CaPIF4后,导致H2O2和O2-含量显著升高。【结论】CaPIF4作为转录因子可能参与调控辣椒的盐耐 受性。

关键词: 辣椒, 盐胁迫, CaPIF4, 转录因子, 活性氧

Abstract:

Objective】Studying the molecular mechanisms of the pepper photoreceptor pigment phytochrome-interacting factor 4(PIF4)in response to salt stress plays an important role in understanding the molecular mechanisms of pepper's response to salt stress and breeding salt-tolerant varieties. 【Method】Using ‘Zunla-1’ cDNA as a template, CaPIF4 was cloned. Then the physical and chemical properties of CaPIF4 were analyzed using bioinformatics software. And the expression pattern and salt stress-induced expression was studied by real-time fluorescence quantitative PCR(RT-qPCR)and virus-induced gene silencing technology(VIGS). 【ResultCaPIF4 was expressed in various tissues of pepper, including roots, stems, leaves, flowers, and fruits, with the highest expression in the leaves. And the expression of CaPIF4 increased with the extension of 300 mmol/L NaCl treatment, and reached the highest at 2 h after treatment. CaPIF4 gene was silenced using VIGS technology. The control group(CK)and gene transient silencing group(pTRV-CaPIF4)were treated in 300 mmol/L NaCl. And the phenotype showed that pTRV-CaPIF4 plants after salt stress presented more obvious salty damage compared with CK. Using VIGS technology to silence CaPIF4, the CK and the pTRV-CaPIF4 were treated with 300 mmol/L NaCl. It was found that the plants in the pTRV-CaPIF4 group were more severely wilted compared to CK after gene silencing, indicating a decrease in salt tolerance in the pTRV-CaPIF4 group. Subcellular localization results showed that CaPIF4 was located in the nucleus. Yeast transcriptional activity analysis revealed that CaPIF4 had transcriptional activation activity. Under high salt stress, the hydrogen peroxide content and antioxidant enzyme activity in the pepper leaves increased. Staining results showed that silencing the CaPIF4 gene resulted in a significant increase in H2O2 and O2- levels. 【Conclusion】CaPIF4, as a transcription factor, may be involved in regulating salt tolerance in peppers.

Key words: Capsicum annuum, salt stress, CaPIF4, transcription factor, ROS