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植物研究 ›› 2022, Vol. 42 ›› Issue (6): 986-996.doi: 10.7525/j.issn.1673-5102.2022.06.008

• 分子生物学 • 上一篇    下一篇

响应盐胁迫调控的露地菊miR398a的克隆及功能研究

岳莉然1, 刘颖婕1, 刘晨旭2, 周蕴薇3()   

  1. 1.东北林业大学,哈尔滨 150040
    2.德州职业技术学院,德州 253000
    3.吉林农业大学,长春 130118
  • 收稿日期:2021-10-20 出版日期:2022-11-20 发布日期:2022-11-22
  • 通讯作者: 周蕴薇 E-mail:dlzhyw@126.com
  • 作者简介:岳莉然(1978—),女,博士,副教授,主要从事园林植物资源与应用方面的研究。
  • 基金资助:
    国家自然科学基金项目(31870687)

Cloning and Functional Analysis of miR398a from Chrysanthemum× grandiflora in Response to Salt Stress

Liran YUE1, Yingjie LIU1, Chenxu LIU2, Yunwei ZHOU3()   

  1. 1.College of Landscape Architecture,Northeast Forest University,Harbin 150040
    2.Dezhou Vocational and Technical College,Dezhou 253000
    3.College of Horticulture,Jilin Agricultural University,Jilin 130118
  • Received:2021-10-20 Online:2022-11-20 Published:2022-11-22
  • Contact: Yunwei ZHOU E-mail:dlzhyw@126.com
  • About author:YUE Liran(1978—),female,Ph.D,associate professor,engaged in Garden plant resources and Application.
  • Supported by:
    National Natural Science Foundation(31870687)

摘要:

miRNAs在非生物胁迫中起着重要的作用。通过前期对露地菊Small RNA高通量测序数据测得到miR398a成熟体和前体序列,命名为cgr-miR398a和cgr-MIR398a。序列对比显示,cgr-miR398a与其他植物中已经鉴定的miR398a序列高度保守;利用前期露地菊降解组数据获得miR398a预测的靶基因,cgr-miR398a根和叶中的靶基因共有18个,其中有铜/锌超氧化物歧化酶(CSD2)、铜伴侣蛋白(CCS)、类A20/AN1-l锌指家族蛋白(SAP8)等与抗性相关的基因。qPCR结果显示盐胁迫下露地菊miR398a及靶基因在不同组织部位的表达水平存在显著的负相关性。为探究cgr-miR398a响应盐胁迫的功能,克隆cgr-MIR398a并构建过表达载体转化拟南芥。结果表明,拟南芥中过表达cgr-MIR398a降低了盐胁迫下种子发芽率以及成苗期的抗盐性,说明cgr-miR398a在拟南芥响应盐胁迫中起着负调控作用。这为进一步研究露地菊mi398a的功能和露地菊的抗盐机理奠定了基础。

关键词: 露地菊, cgr-miR398a, 靶基因, qPCR, 盐胁迫

Abstract:

miRNAs played an important role in abiotic stress, and miR398a and pre-miR398a sequences were obtained from Small RNA database of Chrysanthemum×grandiflora. The sequence alignment showed that the cgr-miR398a was highly conserved with the identified miR398a sequences of other plants. Target genes prediction of cgr-miR398a showed that their annotation of targets include superoxide dismutase[Cu-Zn](CSD2), copper chaperone(CCS), A20/AN1-like zinc finger family protein(SAP8). The qPCR assay showed that the expression levels of miR398a was significantly decreased while target genes showed contrary trend during salt stress in Chrysanthemum×grandiflora. To explore the function of cgr-mir398a in response to salt stress, and an overexpression vector of cgr-mir398a was constructed and transformedinto Arabidopsis thaliana.The result showed that overexpression of the cgr-MIR398a in Arabidopsis could decrease seed germination under salt stress and salt tolerance at the adult seedling stage, therefore cgr-miR398a played a negative regulatory role in Arabidopsis in response to salt stress. The results provided a valuable reference for further exploring the functional mechanism of miR398a during salt stress in Chrysanthemum×grandiflora.

Key words: Chrysanthemum×grandiflora, cgr-miR398a, target gene, qPCR, salt stress

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