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草业学报 ›› 2025, Vol. 34 ›› Issue (9): 162-172.DOI: 10.11686/cyxb2024416

• 研究论文 • 上一篇    

紫花苜蓿MsMYB86基因克隆及其对非生物胁迫的响应分析

鲜燃1(), 邓雨1, 付秋月1, 蒋晶霞1, 陶佳丽1,2, 许涛1(), 朱慧森1(), 岑慧芳1   

  1. 1.山西农业大学草业学院,山西 太谷 030801
    2.山西工程技术学院矿业工程系,山西 阳泉 045000
  • 收稿日期:2024-10-24 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: 许涛,朱慧森
  • 作者简介:xutao@sxau.edu.cn
    E-mail: zhuhuisen@126.com
    鲜燃(2000-),女,四川广元人,在读硕士。E-mail: xr667320@163.com
  • 基金资助:
    国家自然科学基金(32071872);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);山西省基础研究计划(202303021221101);山西省来晋科研奖励(SXBYKY2022118);优秀博士启动项目(2021BQ01);优秀博士启动项目(2023BQ03)

Cloning of alfalfa MsMYB86 and analysis of its transcriptional response to abiotic stress

Ran XIAN1(), Yu DENG1, Qiu-yue FU1, Jing-xia JIANG1, Jia-li TAO1,2, Tao XU1(), Hui-sen ZHU1(), Hui-fang CEN1   

  1. 1.College of Grassland Science,Shanxi Agricultural University,Taigu 030801,China
    2.Department of Mining Engineering,Shanxi Institute of Technology,Yangquan 045000,China
  • Received:2024-10-24 Revised:2024-12-25 Online:2025-09-20 Published:2025-07-02
  • Contact: Tao XU,Hui-sen ZHU

摘要:

紫花苜蓿作为营养价值高、适应性强的优质饲草,在草业生产中占据重要地位。MYB家族是植物中最大的转录因子家族之一,在植物生长发育、次生代谢以及对生物和非生物胁迫的响应中发挥关键作用。本试验以紫花苜蓿为研究对象,通过对MsMYB86基因进行克隆,利用ExPASy、Prabi以及SMART等在线网站和软件对MsMYB86基因编码蛋白的序列特性进行分析,包括相对分子质量、蛋白二级结构预测以及识别蛋白结合域等。采用RT-qPCR技术对MsMYB86基因的组织表达特异性及对不同非生物胁迫的响应情况进行分析。结果显示:MsMYB86基因全长为1104 bp,编码367个氨基酸。该蛋白质的相对分子质量为41.27 kDa,理论等电点(pI)为7.10,脂肪指数高达65.61,显示出明显的亲水性。MsMYB86蛋白质包含两个高度保守的SANT-MYB结构域,且主要定位于细胞核内。MsMYB86基因表达存在组织特异性,且在老茎中的表达水平显著高于其他组织。干旱、盐胁迫以及脱落酸处理下MsMYB86基因均表现出显著的响应性,推测其可能在调控紫花苜蓿对非生物胁迫的响应中发挥作用。研究结果可为阐释MsMYB86基因调控紫花苜蓿非生物胁迫响应机制提供理论基础

关键词: 紫花苜蓿, MsMYB86, 非生物胁迫, 表达模式

Abstract:

Alfalfa (Medicago sativa) occupies a prominent position in forage production as a high-quality forage with excellent nutritional value and wide adaptability. The MYB family is one of the largest families of transcription factors in plants, and its members play crucial roles in plant growth and development, secondary metabolism, and responses to biotic and abiotic stresses. In this study, MsMYB86 was cloned from alfalfa and its putative encoded protein was analyzed using online websites and software such as ExPASy, Prabi, and SMART. These analyses predicted the relative molecular mass, protein secondary structure, and protein-binding domains of the putative MYB86 protein. Tissue-specific transcript profiles of MsMYB86 and its transcriptional response to different abiotic stresses were analyzed by real-time quantitative polymerase chain reaction (RT-qPCR). The results showed that the full-length MsMYB86 coding sequence was 1104 bp long, encoding a polypeptide of 367 amino acids. The protein was predicted to have a relative molecular mass of 41.27 kDa, an isoelectric point of 7.10, and a high lipid index of 65.61, indicating that it is a hydrophilic protein. The MsMYB86 protein was predicted to contain two highly conserved SANT-MYB structural domains and to localize in the nucleus. We detected tissue-specific transcript profiles of MsMYB86, and its transcript levels were significantly higher in mature stems than in other tissues. Transcription of the MsMYB86 gene was responsive to drought, salt stress, and abscisic acid treatment, suggesting that it plays a role in the alfalfa response to abiotic stresses. The results of this study provide a theoretical basis for further studies on the role of MsMYB86 in regulating the abiotic stress response of alfalfa.

Key words: alfalfa, MsMYB86, abiotic stress, expression pattern