生物技术通报 ›› 2025, Vol. 41 ›› Issue (6): 179-190.doi: 10.13560/j.cnki.biotech.bull.1985.2024-1205

• 研究报告 • 上一篇    

花苜蓿TCP基因家族的鉴定及其在干旱胁迫下的表达模式分析

王苗苗1(), 赵相龙1, 王召明2, 刘志鹏1, 闫龙凤3()   

  1. 1.草种创新与草地农业生态系统全国重点实验室 兰州大学草地农业科技学院,兰州 730020
    2.国家草业技术创新中心(筹),呼和浩特 010051
    3.兰州大学生命科学学院,兰州 730020
  • 收稿日期:2024-12-12 出版日期:2025-06-26 发布日期:2025-06-30
  • 通讯作者: 闫龙凤,女,博士,讲师,研究方向 :细胞发育与育种;E-mail: yanlf@lzu.edu.cn
  • 作者简介:王苗苗,女,硕士,研究方向 :牧草种质资源与分子育种;E-mail: 977441324@qq.com
  • 基金资助:
    ?:?内蒙古自治区“揭榜挂帅”项目(2022JBGS0040);2023年国家草业技术创新中心(筹)重大创新平台建设专项(CCPTZX2023N04);国家现代农业产业技术体系(CARS-34)

Identification of TCP Gene Family in Medicago ruthenica and Their Expression Pattern Analysis under Drought Stress

WANG Miao-miao1(), ZHAO Xiang-long1, WANG Zhao-ming2, LIU Zhi-peng1, YAN Long-feng3()   

  1. 1.State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020
    2.National Center of Pratacultural Technology Innovation (Under Preparation), Hohhot 010051
    3.School of Life Sciences, Lanzhou University, Lanzhou 730020
  • Received:2024-12-12 Published:2025-06-26 Online:2025-06-30

摘要:

目的 TCP(Teosinte branched 1/Cincinnata/Proliferating cell factor)是调控植物生长发育和胁迫响应的一类转录因子。解析花苜蓿TCP基因家族成员的序列结构和理化性质,了解花苜蓿MruTCP基因在干旱胁迫下的作用,为牧草分子育种提供基因资源。 方法 基于全基因组水平鉴定花苜蓿TCP基因,对其进行生物信息学分析和干旱胁迫下的表达模式分析。 结果 在花苜蓿中共鉴定到20个TCP基因,分布在7条染色体上。系统进化分析结果表明,MruTCP蛋白分为3个亚家族:PCF、CIN和CYC/TB1,各类蛋白的Motif种类和排列顺序有所差异,均含有一个共同的保守基序Motif 1,家族成员间的结构较为简单。共线性分析结果表明,花苜蓿TCP家族内存在2个片段重复事件,且与大豆之间的亲缘关系最近。启动子顺式作用元件分析的结果表明,MruTCP家族成员功能较为复杂,在信号传递、响应非生物胁迫、光信号响应、激素调节等方面均发挥作用。干旱胁迫下的转录组数据和RT-qPCR的结果表明,花苜蓿TCP基因家族成员在不同时间点和不同浓度干旱处理下的表达模式不同。其中,MruTCP05和MruTCP09包含了丰富的激素响应元件和胁迫响应元件,并且受干旱胁迫的强烈诱导。 结论 结合TCP基因家族的生物信息学分析和表达模式分析结果,推测MruTCP05MruTCP09是调控花苜蓿耐旱性的候选基因。

关键词: 花苜蓿, TCP基因, 干旱胁迫, 转录表达分析

Abstract:

Objective TCP (Teosinte-branched 1/Cincinnata/Proliferating) is a class of transcription factors that regulate plant growth and development and response to stress. Dissecting the sequence structure and physicochemical properties of the TCP gene family members (MruTCP) in Medicago ruthenica will help to understand the role of MruTCP genes under drought stress and provide genetic resources for molecular breeding of forage. Method MruTCP genes were identified based on the whole genome level and analyzed for bioinformatics and expression patterns under drought stress. Result A total of 20 TCP genes were identified in M. ruthenica, and distributed on seven chromosomes. The results of phylogenetic analysis showed that the MruTCP proteins were categorized into three subfamilies: PCF, CIN and CYC/TB1, with differences in the motif types and order of the proteins, but all of them contained a common conserved motif: Motif 1, and the structure of the family members was relatively simple. The results of the covariance analysis indicated that there were two fragment duplication events within the alfalfa TCP family and the closest affinity with soybean. The results of promoter cis-acting element analysis indicated that the MruTCP family members were more complex in function and played roles in signaling, response to abiotic stress, light signaling response, and hormone regulation. Transcriptomic data and qRT-PCR results under drought stress indicated that the expression patterns of MruTCP gene family members differed at different time points and under different concentrations of drought treatments. Among them, MruTCP05 and MruTCP09 contained abundant hormone-responsive elements and stress-responsive elements and were strongly induced by drought stress. Conclusion Combined with the bioinformatics analysis and expression pattern analysis of the TCP gene family, this study hypothesized that MruTCP05 and MruTCP09 are candidate genes for regulating drought tolerance in M. ruthenica.

Key words: Medicago ruthenica, TCP gene, drought stress, transcriptional expression analysis