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草业学报 ›› 2025, Vol. 34 ›› Issue (9): 121-133.DOI: 10.11686/cyxb2024404

• 研究论文 • 上一篇    

紫花苜蓿MsNAC053基因克隆及其对非生物胁迫的响应分析

邹苇鹏(), 刘怡, 翟佳兴, 周思懿, 宫祉祎, 岑慧芳(), 朱慧森(), 许涛   

  1. 山西农业大学草业学院,山西 太谷 030801
  • 收稿日期:2024-10-17 修回日期:2024-12-25 出版日期:2025-09-20 发布日期:2025-07-02
  • 通讯作者: 岑慧芳,朱慧森
  • 作者简介:zhuhuisen@126.com
    E-mail: cenhuifangqk@163.com
    邹苇鹏(1999-),男,四川德阳人,在读硕士。E-mail: 2015389003@qq.com
  • 基金资助:
    国家自然科学基金(32071872);国家自然科学基金(31402131);山西省中央引导地方科技发展资金项目(YDZJSX2022B006);山西重点研发计划课题(202102140601006-3);山西农业大学博士科研启动专项(2021BQ01)

Cloning of MsNAC053 from alfalfa and analysis of its transcript profile in response to abiotic stresses

Wei-peng ZOU(), Yi LIU, Jia-xing ZHAI, Si-yi ZHOU, Zhi-yi GONG, Hui-fang CEN(), Hui-sen ZHU(), Tao XU   

  1. College of Grassland Science,Shanxi Agricultural University,Taigu 030801,China
  • Received:2024-10-17 Revised:2024-12-25 Online:2025-09-20 Published:2025-07-02
  • Contact: Hui-fang CEN,Hui-sen ZHU

摘要:

NAC(NAM、ATAF1/2、CUC1/2)转录因子是植物特有的转录因子,在调控植物生长发育、激素信号转导及胁迫响应等过程中发挥重要作用。紫花苜蓿是世界范围内重要的豆科牧草之一,营养丰富,品质优良。为探究紫花苜蓿NAC053基因功能,利用SnapGene及NCBI设计特异性引物并利用PCR技术克隆MsNAC053基因,利用生物信息学软件分析其蛋白质理化性质、二级结构和亚细胞定位情况等,并使用实时荧光定量PCR(qRT-PCR)分析MsNAC053基因在紫花苜蓿不同组织中的表达模式及对不同非生物胁迫的响应情况,利用农杆菌介导法将DNA酶切及连接构建的亚细胞定位载体导入烟草叶片进行亚细胞定位。结果表明:MsNAC053基因编码区全长903 bp,编码300个氨基酸,其蛋白相对分子量为34.62 kDa,脂溶指数为73.82,理论等电点为7.05,平均亲水性为-0.604,不稳定系数为47.28,为不稳定的亲水性蛋白,不具备跨膜结构,具有响应冷胁迫及脱落酸等的顺式作用元件。亚细胞定位结果显示其定位于细胞核中,系统进化树和氨基酸序列分析表明MsNAC053与蒺藜苜蓿、长柔毛野豌豆等豆科植物亲缘关系较近。qRT-PCR结果表明,MsNAC053基因表达具有组织特异性,在幼叶中表达量最高,在子叶中表达量最低;干旱、盐及脱落酸(ABA)处理均能诱导MsNAC053基因的表达,表明MsNAC053基因参与紫花苜蓿应对干旱、盐胁迫响应。本研究为紫花苜蓿抗逆分子育种提供了理论依据及候选基因。

关键词: 紫花苜蓿, NAC转录因子, 基因克隆, 表达分析, 非生物胁迫

Abstract:

The NAC (NAM, ATAF1/2, CUC1/2) transcription factors are plant-specific regulators that play critical roles in plant growth and development, hormone signaling, and stress responses. Alfalfa (Medicago sativa), one of the most important leguminous forage crops worldwide, is renowned for its high nutritional value and quality. To investigate the function of the MsNAC053 gene in alfalfa, specific primers were designed using SnapGene and NCBI to clone MsNAC053 through polymerase chain reaction (PCR) technology. The physicochemical properties, secondary structure, and subcellular localization of the protein were analyzed through bioinformatics tools. And the tissue-specific expression patterns of MsNAC053 and its responses to abiotic stresses were analyzed through quantitative real-time PCR (qRT-PCR). The subcellular localization analysis were conducted by introducing vector into tobacco (Nicotianatabacum) leaves via Agrobacterium-mediated transformation. The results showed that the coding region of MsNAC053 was 903 bp, encoding 300 amino acids, with a predicted molecular weight of 34.62 kDa, an aliphatic index of 73.82, a theoretical isoelectric point (pI) of 7.05, a grand average hydropathicity of -0.604, and an instability coefficient of 47.28, categorizing it as an unstable hydrophilic protein without transmembrane regions. Cis-acting elements responsive to low-temperature (LTR) and abscisic acid responsiveness (ABRE) were identified. Subcellular localization confirmed that MsNAC053 was localized in nucleus. Phylogenetic and amino acid sequence analyses revealed close evolutionary relationships between MsNAC053 and other NAC proteins from leguminous species such as Medicago truncatula and Vicia villosa. qRT-PCR demonstrated tissue-specific expression of MsNAC053, with the highest expression level in young leaves and the lowest expression level in cotyledons. Drought, salt, and ABA treatments significantly upregulated the expression level of MsNAC053, indicating that it plays a role in response to drought and salt stresses. In summary, the results of this study provides both theoretical insights and a candidate gene for molecular breeding of stress-resistant alfalfa varieties.

Key words: alfalfa, NAC transcription factor, gene cloning, expression analysis, abiotic stress