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Acta Prataculturae Sinica ›› 2025, Vol. 34 ›› Issue (5): 89-104.DOI: 10.11686/cyxb2024247

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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

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