玉米转录因子 ZmNAC59 调控植物抗盐性
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四川农业大学

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国家自然科学基金项目(31971825)


Maize Transcription Factor ZmNAC59 Regulates Plant Salt Resistance
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    摘要:

    【目的】 NAC转录因子家族是植物中研究较多的一类转录因子,在调控植物生长发育和响应非生物胁迫过程中起着重要作用。玉米是三大粮食作物之一,在其生长过程中常常会面临各种逆境胁迫,盐害被认为是限制作物生长和生产的主要环境因素之一。因此鉴定玉米抗盐基因,解析其抗盐机制对培育玉米抗逆品种具有重要意义。【方法】本研究克隆了玉米转录因子ZmNAC59并利用生物信息学手段分析其保守结构域和系统进化关系,使用实时荧光定量PCR的方法分析了该基因在NaCl和MeJA处理下的表达模式,并使用稳定转基因体系将该基因异源表达入拟南芥观察表型,同时还利用了病毒诱导沉默技术将该基因在玉米中沉默后进行盐处理表型观察,并进行了酶活性的检测。【结果】实时荧光定量PCR的结果表明ZmNAC59能够被NaCl和MeJA诱导上调。病毒诱导沉默ZmNAC59后进行盐胁迫,沉默株系对盐胁迫更敏感,ROS积累更多;而ZmNAC59过表达拟南芥后,过表达株系在盐胁迫处理下存活率更高,活性氧积累更少,Na+/K+比率低,表明ZmNAC59作为盐胁迫中的正调控因子可以通过调节离子流动提高植物抗盐性。实时荧光定量PCR结果表明拟南芥过表达株系中Na+、K+转运相关的基因显著上调;在玉米原生质体中瞬时过表达ZmNAC59后进行盐处理发现ZmSOS1、ZmNHX1和ZmNHX7的表达显著上调,Dual-LUC实验表明ZmSOS1是ZmNAC59 的靶基因。【结论】本研究发现ZmNAC59通过激活 ZmSOS1的表达促进盐胁迫下的离子转运从而提高植物抗盐性,为玉米抗逆基因资源的筛选和品种培育提供了科学的理论依据。

    Abstract:

    【Objective】NAC transcription factor family is a class of transcription factors that are widely studied in plants. It plays an important role in regulating plant growth and development and responding to abiotic stress. Maize is one of the three major food crops, which will face various adverse stresses in its growth process. Salt damage is considered to be one of the main environmental factors limiting crop growth and production. Therefore, it is of great significance to identify maize salt resistance genes and analyze their salt resistance mechanism for breeding maize stress resistant varieties. 【Method】This study cloned the maize transcription factor ZmNAC59 and analyzed its conserved domain and phylogenetic relationship using bioinformatics methods. The expression pattern of the gene in leaves under NaCl and MeJA treatment was analyzed using the Quantitative Real-time PCR method. The stable transgenic system was used to heterologously express the gene into Arabidopsis for phenotype observation. At the same time, virus-induced silencing technology was used to silence the gene in maize, followed by salt treatment phenotype observation and enzyme activity detection. 【Result 】The qRT-PCR results showed that ZmNAC59 could be up-regulated by NaCl and MeJA. After virus-induced silencing of ZmNAC59, the silenced strains were more sensitive to salt stress and accumulated more ROS. After overexpression of ZmNAC59 in Arabidopsis thaliana, the overexpression lines had higher survival rate, less accumulation of reactive oxygen species and lower Na+/K+ ratio under salt stress, indicating that ZmNAC59, as a positive regulator of salt stress, can improve plant salt resistance by regulating ion flow. qRT-PCR results showed that Na+, K+ transport related genes were significantly up-regulated in Arabidopsis overexpression lines; After transient overexpression of ZmANC59 in maize protoplasts, the expression of ZmSOS1, ZmNHX1 and ZmNHX7 were significantly up-regulated after salt treatment. The Dual-Luc experiment showed that ZmSOS1 was the target gene of ZmNAC59. 【Conclusion】 This study found that ZmNAC59 could promote ion transport under salt stress by activating the expression of ZmSOS1, which provided a scientific theoretical basis for the screening of maize stress resistance gene resources and cultivar cultivation.

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张宇涵,李星霖,刘丽君,等.玉米转录因子 ZmNAC59 调控植物抗盐性[J].西北植物学报,2024,44(3):381-395

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  • 收稿日期:2023-07-17
  • 最后修改日期:2023-11-19
  • 录用日期:2023-12-04
  • 在线发布日期: 2024-03-07
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