植物学报 ›› 2025, Vol. 60 ›› Issue (2): 186-203.DOI: 10.11983/CBB24101  cstr: 32102.14.CBB24101

• 研究论文 • 上一篇    下一篇

番茄SlWRKY45转录因子在响应低温和干旱胁迫中的功能(长英文摘要)

樊蓓1, 任敏1, 王延峰1,2, 党峰峰1,2, 陈国梁1,2, 程国亭1,2, 杨金雨1, 孙会茹1,2,*()   

  1. 1延安大学生命科学学院, 延安 716000
    2延安大学生命科学学院, 陕西省黄土高原资源植物研究与利用省市共建重点实验室, 延安 716000
  • 收稿日期:2024-07-08 接受日期:2024-10-14 出版日期:2025-03-10 发布日期:2024-10-16
  • 通讯作者: 孙会茹
  • 基金资助:
    延安大学博士科研启动项目(YDBK2019-42);陕西省自然科学基础研究计划(2022JQ-159);陕西省大学生创新创业训练计划(S202310719073)

Functions of SlWRKY45 in Response to Low-temperature and Drought Stress in Tomato

Bei Fan1, Min Ren1, Yanfeng Wang1,2, Fengfeng Dang1,2, Guoliang Chen1,2, Guoting Cheng1,2, Jinyu Yang1, Huiru Sun1,2,*()   

  1. 1College of Life Sciences, Yan’an University, Yan’an 716000, China
    2Shaanxi Key Laboratory of Research and Utilization of Resource Plants on the Loess Plateau, College of Life Sciences, Yan’an University, Yan’an 716000, China
  • Received:2024-07-08 Accepted:2024-10-14 Online:2025-03-10 Published:2024-10-16
  • Contact: Huiru Sun

摘要: 番茄(Solanum lycopersicum)在生长发育过程中常受到低温和干旱等多种非生物胁迫的影响。WRKY转录因子参与调控植物多种非生物胁迫响应过程, 而SlWRKY45在番茄非生物胁迫中的功能尚不清楚。基因表达分析发现, 低温、干旱和ABA处理均可显著诱导SlWRKY45的表达; 过表达SlWRKY45可提高番茄对干旱和低温的耐受性; 在干旱和低温处理下, 过表达株系的光合指标、抗氧化酶活性和脯氨酸(Pro)含量显著高于野生型(WT), 活性氧(ROS)和丙二醛(MDA)含量显著低于WT。转录组数据分析显示, SlWRKY45主要通过调控抗氧化酶活性和胁迫响应途径介导番茄对低温胁迫的响应。双荧光素酶报告基因检测发现, SlWRKY45可直接激活SlPOD1的表达。酵母双杂交(Y2H)和双分子荧光互补(BiFC)试验结果表明, SlWRKY45与SlWRKY46存在相互作用。综上表明, SlWRKY45可能通过直接调控抗氧化酶途径增强转基因番茄的抗逆性, 为番茄的遗传改良提供了重要的候选基因资源。

关键词: 番茄, SlWRKY45, 干旱胁迫, 低温胁迫, 抗氧化酶

Abstract: INTRODUCTION Tomato (Solanum lycopersicum), a significant warm-season and water-dependent vegetable crop, is extensively cultivated worldwide. Whether grown in open fields or protected environments, tomatoes frequently encounter various environmental stresses, including drought and low temperatures, which significantly impact their yield and quality. Transcription factors play a pivotal role in plant stress responses by modulating the expression of specific target genes, thereby transmitting perceived stress signals downstream. WRKY transcription factors in tomatoes are known to regulate responses to multiple abiotic stresses. However, the specific role of the tomato SlWRKY45 in abiotic stress responses remains unclear. RATIONALEStudies have demonstrated that WRKY transcription factors play a crucial regulatory role in plant responses to abiotic stress. As an important economic vegetable crop, tomato is susceptible to various environmental stresses during its growth and development. By genetically overexpressing SlWRKY45 in tomato and investigating its function under low-temperature and drought stress conditions, the findings can provide a theoretical foundation for understanding the complex regulatory mechanisms of WRKY transcription factors. Additionally, this research offers valuable candidate genes for breeding stress-resistant tomato varieties. RESULTSExpression analysis revealed that low-temperature, drought, and abscisic acid (ABA) treatments significantly induced the expression of SlWRKY45. Overexpression of SlWRKY45 enhanced the resistance of tomato plants to drought and low-temperature stresses. Under drought and low-temperature conditions, the photosynthetic indices, antioxidant enzyme activities, and proline (Pro) contents in SlWRKY45 overexpression lines were significantly higher than those in wild-type (WT) plants. Conversely, the accumulation of reactive oxygen species (ROS) and malondialdehyde (MDA) levels in SlWRKY45-OE plants was significantly lower than in WT plants under the same stress conditions. Transcriptome data analysis indicated that SlWRKY45 regulates tomato's response to low-temperature stress primarily by influencing antioxidant enzyme activities and stress response pathways. Dual-luciferase assays demonstrated that SlWRKY45 could directly activate the expression of SlPOD1. Furthermore, the interaction between SlWRKY45 and SlWRKY46 was confirmed through yeast two-hybrid (Y2H) and bimolecular fluorescence complementation (BiFC) assays. CONCLUSIONOur findings demonstrate that SlWRKY45 positively regulates drought resistance and low-temperature tolerance in tomato. Additionally, SlWRKY45 can interact with SlWRKY46 and directly activate the expression of SlPOD1. These results offer valuable insights for further research into the regulatory mechanisms underlying abiotic stress responses and provide potential gene resources for genetic improvement through molecular breeding. Phenotypes of SlWRKY45-overexpressing and wild-type plants under drought and low-temperature treatments

Key words: tomato, SlWRKY45, drought stress, low-temperature stress, antioxidase

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