欢迎访问《草业学报》官方网站,今天是 分享到:

草业学报 ›› 2025, Vol. 34 ›› Issue (5): 89-104.DOI: 10.11686/cyxb2024247

• 研究论文 • 上一篇    下一篇

紫花苜蓿低温诱导蛋白MsLTI65的分离及其对不同逆境的响应

周昕越1(), 王丽萍2, 蒋庆雪1, 马晓冉1, 仪登霞1, 王学敏1()   

  1. 1.中国农业科学院北京畜牧兽医研究所,北京 100193
    2.山西省太原市东西山林区管护中心,山西 太原 030000
  • 收稿日期:2024-06-24 修回日期:2024-07-22 出版日期:2025-05-20 发布日期:2025-03-20
  • 通讯作者: 王学敏
  • 作者简介:E-mail: wangxuemin@caas.cn
    周昕越(1998-),男,蒙古族,内蒙古赤峰人,在读博士。E-mail: zhouxinyuenmg@163.com
  • 基金资助:
    财政部和农业农村部:国家现代农业产业技术体系(CARS-34);中国农业科学院科技创新工程项目(ASTIP-IAS10);农业种质资源普查收集、保护鉴定服务(19240485)

Isolation of the low-temperature induced proteinMsLTI65 from alfalfa and its response to different stresses

Xin-yue ZHOU1(), Li-ping WANG2, Qing-xue JIANG1, Xiao-ran MA1, Deng-xia YI1, Xue-min WANG1()   

  1. 1.Institute of Animal Sciences,Chinese Academy of Agricultural Sciences,Beijing 100193,China
    2.Taiyuan Dongxishan Forest Area Management Center,Taiyuan 030000,China
  • Received:2024-06-24 Revised:2024-07-22 Online:2025-05-20 Published:2025-03-20
  • Contact: Xue-min WANG

摘要:

LTI是植物中一类低温诱导蛋白,在植物响应非生物胁迫中发挥着重要的作用。为明确紫花苜蓿LTI蛋白的结构特征及在不同非生物胁迫下的响应,通过RT-PCR和3′/5′ RACE PCR技术,成功从“中苜1号”紫花苜蓿中克隆得到MsLTI65基因cDNA序列。利用生物信息学软件对基因序列和结构进行分析,并与其他植物的LTI蛋白进行系统进化树构建,分析它们之间的进化关系。采用实时荧光定量PCR(qRT-PCR)和蛋白免疫印迹(western-blot,WB)技术分析MsLTI65在不同非生物胁迫条件下的表达模式。序列分析表明,MsLTI65基因编码区序列长2016 bp,编码671个氨基酸,分子量74 kDa,理论等电点为4.55,MsLTI65蛋白与蒺藜苜蓿的MtLTI65蛋白具有较高的同源性。qRT-PCR检测结果表明,MsLTI65基因在冷、盐、干旱、Cu2+、Zn2+和脱落酸(ABA)胁迫下表达量均受到诱导上调表达。抗体制备结果表明,已成功制备MsLTI65多克隆抗体,该多克隆抗体特异性高,能够识别天然LTI65样本。Western-blot验证结果表明,MsLTI65蛋白受冷、干旱、盐、ABA胁迫诱导表达。以上结果表明,MsLTI65基因可能作为一个正向调控因子在冷、干旱、Cu2+、Zn2+、盐等多种非生物胁迫信号和ABA激素信号转导过程中发挥重要作用。

关键词: 紫花苜蓿, MsLTI65, 基因克隆, 表达分析, 抗体, 非生物胁迫

Abstract:

Low temperature-inducible (LTI) proteins are a class of stress-responsive proteins in plants that play a crucial role in response to abiotic stress. To elucidate the structural characteristics of the MsLTI65 protein in alfalfa (Medicago sativa) and its response to various abiotic stresses, the cDNA sequence of the MsLTI65 gene was successfully cloned from alfalfa cultivar “Zhongmu No.1” using reverse-transcription polymerase chain reaction (RT-PCR) and 3′/5′ rapid-amplification of cDNA ends (RACE PCR) techniques. Bioinformatics tools were employed to analyze the gene sequence and structure, and a phylogenetic tree was constructed to explore the evolutionary relationships between MsLTI65 and LTI proteins from other plants. The expression pattern of MsLTI65 under different abiotic stress conditions was analyzed by quantitative real-time PCR (qRT-PCR) and Western blotting (WB). Sequence analysis indicated that the MsLTI65 gene had a coding region sequence length of 2016 bp, encoding a polypeptide of 671 amino acids with a molecular weight of 74 kDa and a theoretical isoelectric point of 4.55. The MsLTI65 protein showed high homology with the MtLTI65 protein from Medicago truncatula. The qRT-PCR results showed that MsLTI65 expression was induced and upregulated under cold, salt, drought, Cu2+, Zn2+, and abscisic acid (ABA) stresses. The antibody preparation results indicated that a polyclonal antibody against MsLTI65 was successfully generated. This polyclonal antibody exhibited high specificity and was able to recognize native LTI65 samples. Western-blot validation demonstrated that MsLTI65 protein expression is induced by drought, salt, cold and ABA stresses. The results of this study suggest that MsLTI65 functions as a positive regulatory factor in the signal transduction of various abiotic stresses, including cold, drought, Cu2+, Zn2+, salt, and ABA hormone signaling.

Key words: Medicago sativa, MsLTI65, gene cloning, expression analysis, antibody, abiotic stresses