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植物研究 ›› 2026, Vol. 46 ›› Issue (2): 259-269.doi: 10.7525/j.issn.1673-5102.2026.02.006

• 研究论文column:Original Paper • 上一篇    下一篇

基于CRISPR/Cas9敲除阐明AtMST1通过H2S合成调控拟南芥耐盐性

曹海艳1, 田楷文2, 贾晓宇1, 郝雪峰1, 金竹萍2()   

  1. 1.太原师范学院生物科学与技术学院,晋中 030619
    2.山西大学生命科学学院,特色植物资源研究与利用山西省重点实验室,太原 030006
  • 收稿日期:2026-02-18 出版日期:2026-03-20 发布日期:2026-04-02
  • 通讯作者: 金竹萍 E-mail:jinzhuping@sxu.edu.cn
  • 作者简介:曹海艳(1995—),女,博士研究生,讲师,主要从事气体信号与植物逆境应答研究。
  • 基金资助:
    山西省基础研究计划资助项目(202403021212063);山西省基础研究计划资助项目(202503021211222);山西大学杏花村学院开放基金项目(XCSXU-KF-202401)

The Role of AtMST1 in Regulating Salt Tolerance via H2S Synthesis in Arabidopsis Revealed by CRISPR/Cas9 Knockout

Haiyan CAO1, Kaiwen TIAN2, Xiaoyu JIA1, Xuefeng HAO1, Zhuping JIN2()   

  1. 1.College of Biological Sciences and Technology,Taiyuan Normal University,Jinzhong 030619
    2.Shanxi Key Laboratory for Research and Development of Regional Plants,School of Life Science,Shanxi University,Taiyuan 030006
  • Received:2026-02-18 Online:2026-03-20 Published:2026-04-02
  • Contact: Zhuping JIN E-mail:jinzhuping@sxu.edu.cn

摘要:

硫化氢(hydrogen sulfide,H2S)是植物体内重要的气体信号分子,其生物合成依赖多种内源生成酶。3-巯基丙酮酸硫转移酶(3-mercaptopyruvate sulfurtransferase,MST)在动物系统中已被证实能够生成H2S,而拟南芥(Arabidopsis thaliana)MST1也被报道具有类似的酶活性。为在植物体内进一步验证AtMST1蛋白的H2S生成功能,并探究其在盐胁迫响应中的作用,本研究利用CRISPR/Cas9基因编辑技术对拟南芥AtMST1基因进行定向编辑。通过设计4个靶位点并构建基因编辑载体,经农杆菌(Agrobacterium)转化后,成功获得atmst1纯合突变体。基因型分析表明,突变体在靶位点插入单个T碱基,导致移码突变及蛋白质翻译提前终止。生理检测结果显示,与野生型相比,atmst1突变体的H2S荧光探针信号强度、H2S含量及产率均显著降低。在盐胁迫处理下,atmst1植株表现出明显的盐敏感表型,且幼苗根中积累更多的活性氧。综上,本研究成功构建了AtMST1蛋白功能缺失突变体,从遗传学层面证实AtMST1蛋白在植物内源H2S合成中的关键作用,并揭示其通过调节H2S水平正调控拟南芥耐盐性的生理功能。

关键词: AtMST1基因, CRISPR/Cas9基因编辑技术, 硫化氢, 拟南芥, 盐胁迫

Abstract:

Hydrogen sulfide(H2S) is an important gaseous signaling molecule in plants, and its biosynthesis relies on various endogenous enzymes. The enzyme 3-mercaptopyruvate sulfurtransferase(MST) has been established as an H2S generator in animal systems, and a similar enzymatic activity has been reported for Arabidopsis MST1. To further validate the H2S-producing function of AtMST1 in plants and explore its role in salt stress response, CRISPR/Cas9-mediated gene editing to target the AtMST1 gene was employed in Arabidopsis thaliana. By designing four target sites and constructing the gene editing vector, homozygous atmst1 mutants following Agrobacterium-mediated transformation were successfully obtained. Genotyping analysis revealed that the mutant carried a single T-nucleotide insertion at the target site, resulting in a frameshift mutation and premature termination of translation. Compared with the wild type, the atmst1 mutant showed a significant reduction in the intensity of H2S-specific fluorescent signals, as well as in both H2S content and production rate. Salt stress treatment resulted in a clear salt-sensitive phenotype and greater reactive oxygen species accumulation in the roots of atmst1 seedlings. In summary, this study successfully created an AtMST1 loss-of-function mutant, providing genetic evidence for its crucial role in endogenous H2S synthesis in plants and revealing its physiological function in positively regulating salt tolerance in Arabidopsis by modulating H2S levels.

Key words: AtMST1 gene, CRISPR/Cas9 gene-editing technology, hydrogen sulfide, Arabidopsis thaliana, salt stress

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