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草业学报 ›› 2025, Vol. 34 ›› Issue (6): 154-167.DOI: 10.11686/cyxb2024277

• 研究论文 • 上一篇    

外源NO调控干旱胁迫下紫花苜蓿AP2/ERFs基因的表达分析

温小月1(), 赵颖1,2,3(), 王宝强1,2,3, 王贤1,4, 朱晓林1,4, 王义真1,4, 魏小红1,2,3,4   

  1. 1.甘肃农业大学生命科学技术学院,甘肃 兰州 730070
    2.甘肃省作物遗传改良与种质创新重点实验室,甘肃 兰州 730070
    3.甘肃省干旱生境作物学重点实验室,甘肃 兰州 730070
    4.甘肃农业大学农学院,甘肃 兰州 730070
  • 收稿日期:2024-07-16 修回日期:2024-09-05 出版日期:2025-06-20 发布日期:2025-04-03
  • 通讯作者: 赵颖
  • 作者简介:Corresponding author. E-mail: 1137974332@qq.com
    温小月(1998-),女,江西宜春人,在读硕士。E-mail: 1096106697@qq.com
  • 基金资助:
    甘肃农业大学科技创新基金-科研启动基金(GSAU-KYQD-2020-7);国家自然科学基金(32060401)

Expression analysis of AP2/ERFs genes in alfalfa regulated by exogenous NO under drought stress

Xiao-Yue WEN1(), Ying ZHAO1,2,3(), Bao-qiang WANG1,2,3, Xian WANG1,4, Xiao-lin ZHU1,4, Yi-zhen WANG1,4, Xiao-hong WEI1,2,3,4   

  1. 1.College of Life Science and Technology,Gansu Agriculture University,Lanzhou 730070,China
    2.Gansu Key Laboratory of Crop Improvement & Germplasm Enhancement,Lanzhou 730070,China
    3.Gansu Provincial Key Laboratory of Aridland Crop Science,Lanzhou 730070,China
    4.College of Agronomy,Gansu Agriculture University,Lanzhou 730070,China
  • Received:2024-07-16 Revised:2024-09-05 Online:2025-06-20 Published:2025-04-03
  • Contact: Ying ZHAO

摘要:

紫花苜蓿是世界上种植最广泛的饲用豆科作物。APETALA2/ethylene-responsive factor(AP2/ERF)转录因子在植物抵御非生物胁迫中起着关键作用。一氧化氮(nitric oxide,NO)作为植物体内的一种信号分子,在植物抗旱中扮演重要角色。本研究利用生物信息学方法对紫花苜蓿MsAP2/ERF基因家族成员进行鉴定及其对NO和干旱的响应模式分析,并从MsAP2/ERF基因家族中筛选到强烈响应NO调控的MsERF07基因进行亚细胞定位。结果表明,该家族成员均含有AP2结构域,其蛋白质的氨基酸数目介于176~422;亚细胞定位预测大部分蛋白都定位在细胞核; MsERF01MsERF11的亲缘关系较近,并且它们具有相似的结构域;61.54%的MsAP2/ERF基因只含有外显子,也具有高度相似的保守基序;蛋白互作显示MsERF01和MsERF11、MsERF05和MsERF07均处于蛋白互作图中的同一节点;13个MsAP2/ERF基因家族成员被不均匀分布在13条染色体上,MsAP2/ERF基因家族成员的启动子序列中有43个与光反应、组织特异性表达、胁迫以及植物激素相关的顺式调控元件。此外,紫花苜蓿的转录组测序数据分析表明大部分MsAP2/ERF基因家族成员在NO的调控下表达量增加,进一步qRT-RCR试验结果显示,外源NO促进了干旱胁迫下MsAP2/ERF基因的表达量。克隆MsERF07基因,亚细胞定位结果显示该蛋白定位在细胞核与细胞膜中,本研究为后续研究紫花苜蓿MsERF07基因响应干旱胁迫的分子机制提供了基础。

关键词: 干旱胁迫, 一氧化氮, 紫花苜蓿, AP2/ERF

Abstract:

Alfalfa (Medicago sativa) is the most widely grown forage legume crop in the world. APETALA2/ethylene-responsive (AP2/ERF) transcription factors play a key role in plant resistance to abiotic stress. Nitric oxide (NO), as a signaling molecule in plants, plays an important role in plant drought resistance. In this study, bioinformatics methods were used to identify members of the alfalfa MsAP2/ERF gene family and analyze their response patterns to NO and drought. The MsERF07 gene, which strongly responds to NO regulation, was screened from the MsAP2/ERF gene family for subcellular localization. The results showed that all members of the family contained AP2 domains, and the number of amino acids in their proteins ranged from 176 to 422. Subcellular localization predicted that most proteins were localized in the nucleus. MsERF01 and MsERF11 were closely related and had similar domains. 61.54% of MsAP2/ERF genes contained only exons and also had highly similar conserved motifs. Protein interaction showed that MsERF01 and MsERF11, MsERF05 and MsERF07 were all located at the same node in the protein interaction map. The 13 MsAP2/ERF gene family members were unevenly distributed on 13 chromosomes, and there were 43 cis-regulatory elements related to light response, tissue-specific expression, stress and plant hormones in the promoter sequences of the MsAP2/ERF gene family members. In addition, transcriptome sequencing data analysis of alfalfa showed that the expression of most MsAP2/ERF gene family members increased under the regulation of NO, and further qRT-RCR experimental results showed that exogenous NO promoted the expression of MsAP2/ERF genes under drought stress. The MsERF07 gene was cloned, and subcellular localization results showed that the protein was localized in the nucleus and cell membrane. This study provides a basis for subsequent research on the molecular mechanism of the alfalfa MsERF07 gene action in response to drought stress.

Key words: drought stress, nitric oxide, alfalfa, AP2/ERF