华北农学报 ›› 2022, Vol. 37 ›› Issue (6): 191-200. doi: 10.7668/hbnxb.20193069

所属专题: 棉花 植物保护 生物技术 热点文章

• 资源环境·植物保护 • 上一篇    下一篇

棉花WRKY7基因克隆及其对黄萎病抗性分析

曾焱明1,2, 胡广2, 贾培1,2, 唐叶2, 王炳婷2, 武盼2, 陆承哲1,2, 陈爱民3, 彭清忠1, 吴家和1,2,   

  1. 1 吉首大学 生物资源与环境科学学院,湖南 吉首 416000
    2 中国科学院 微生物研究所,植物基因组学国家重点实验室,北京 100101
    3 九圣禾种业股份有限公司,农业农村部西北内陆棉花品种创制重点实验室,新疆 昌吉 831100
  • 收稿日期:2022-06-17 出版日期:2022-12-28
  • 通讯作者:
    吴家和(1968—),男,安徽合肥人,研究员,博士,博士生导师,主要从事分子生物学研究。
  • 作者简介:

    曾焱明(1992—),女,湖南吉首人,在读硕士,主要从事分子生物学研究。

  • 基金资助:
    棉花生物学国家重点实验室开放课题基金(CB2021B02); 国家自然科学基金(3197151216)

Cotton WRKY7 Cloning and Analysis of Plant Resistance to Verticillium wilt

ZENG Yanming1,2, HU Guang2, JIA Pei1,2, TANG Ye2, WANG Bingting2, WU Pan2, LU Chengzhe1,2, CHEN Aimin3, PENG Qingzhong1, WU Jiahe1,2,   

  1. 1 College of Biology and Environmental Sciences,Jishou University,Jishou 416000,China
    2 Institute of Microbiology,Chinese Academy of Sciences,State Key Laboratory of Plant Genomics,Beijing 100101,China
    3 Key Laboratory of Northwest Inland Cotton Variety Creation,Ministry of Agriculture and Rural Affairs Innovation Join Hope Seed Corporation,Ltd.,Changji 831100,China
  • Received:2022-06-17 Published:2022-12-28

摘要:

鉴定抗病基因并培育抗病棉花品种是目前根治棉花黄萎病的最好方法。利用MEGA 5.2等相关软件,构建棉花抗病相关基因WRKY7与拟南芥和水稻中抗病相关WRKY基因编码蛋白系统进化树。通过亚细胞定位技术、病毒诱导基因沉默技术、qPCR及GUS报告系统分析等技术,阐明GhWRKY7基因对大丽轮枝菌的诱导响应及其机制。结果表明:GhWRKY7和AtWKRY7高度同源,同属于Ⅱ类;GhWRKY7定位于植物细胞核内,其在棉花叶和根器官中的相对表达量显著高于茎;GhWRKY7基因表达受到大丽轮枝菌浸染诱导,在浸染24 h后呈显著上调。沉默GhWRKY7基因棉花对大丽轮枝菌抗性下降;和对照植株(表达TRV空载体植株)相比,接菌后沉默植株中GhPR1GhPR3GhPR4GhPR5GhPDF1.2GhPAL1GhCYP71B36等抗病相关基因的表达水平也显著下调,暗示GhWRKY7通过调控抗病相关基因的表达来提高植株的抗病性。构建GUS报告载体在烟草细胞中瞬时表达分析,揭示GhWRKY7基因能特异地结合GhCYP71B36启动子顺式元件,转录激活下游GhCYP71B36表达,从而提高棉花的抗病性。综上所述,GhWRKY7作为一个正调控棉花抗黄萎病的转录因子,参与如植保素Camalexin合成等下游抗病相关基因的表达,从而提高植株的抗病性。因此,GhWRKY7可以作为棉花抗病育种的候选基因,为棉花生产提供安全保障。

关键词: 陆地棉, 大丽轮枝菌, GhWRKY7, GhCYP71B36, 基因沉默

Abstract:

To eradicate Verticillium wilt of cotton,identification of resistant genes and breeding of resistant cotton varieties are the best methods at present.We used MEGA 5.2 and other related software to construct phylogenetic trees of the proteins encoded by WRKY7 genes in Gossypium hirsutum and Arabidopsis thaliana and Oryza sativa.The induction and response of GhWRKY7 gene to Verticillium dahliae and its mechanism were elucidate by subcellular localization,virus-induced gene silencing,qPCR and GUS reporting system analysis.The results showed that GhWRKY7 and AtWKRY7 were highly homologous and belonged to Group Ⅱ.GhWRKY7 was located in plant nucleus,and the relative expression of GhWRKY7 in cotton leaves and root organs was significantly higher than that in stems.GhWRKY7 gene expression was significantly upregulated after 24 h of inoculation.The GhWRKY7-silenced plants showed higher susceptibility to Verticillium dahliae infection compared to the control(Expression TRV empty vector plants),suggesting that GhWRKY7 gene positively regulated cotton disease resistance.Compared to the control,the expression levels of disease-resistance related genes,including GhPR1,GhPR3,GhPR4,GhPR5,GhPDF1.2,GhPAL1 and GhCYP71B36 in GhWRKY7-silenced plants significantly decreased after inoculation,indicating that GhWRKY7 improved the disease resistance of the plants due to increased the expression levels of disease-resistance related genes.Transient expression analysis of GhWRKY7 gene by constructing GUS reporter vector in tobacco cells revealed that GhCYP71B36 gene could specifically bound to cis-element of GhCYP71B36 promoter and transcriptionally activated downstream GhCYP71B36 expression,thus improved the disease resistance of cotton.In conclusion,GhWRKY7,as a transcription factor that positively regulates Verticillium wilt resistance in cotton,is involved in the expression of downstream disease-resistance related genes such as Camalexin synthesis,thereby improving plant disease resistance.Therefore,GhWRKY7 can be used as a candidate gene for cotton resistance breeding and provide security for cotton production.

Key words: Gossypium hirsutum, Verticillium dahliae, GhWRKY7, GhCYP71B36, Gene silencing

引用本文

曾焱明, 胡广, 贾培, 唐叶, 王炳婷, 武盼, 陆承哲, 陈爱民, 彭清忠, 吴家和. 棉花WRKY7基因克隆及其对黄萎病抗性分析[J]. 华北农学报, 2022, 37(6): 191-200. doi: 10.7668/hbnxb.20193069.

ZENG Yanming, HU Guang, JIA Pei, TANG Ye, WANG Bingting, WU Pan, LU Chengzhe, CHEN Aimin, PENG Qingzhong, WU Jiahe. Cotton WRKY7 Cloning and Analysis of Plant Resistance to Verticillium wilt[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(6): 191-200. doi: 10.7668/hbnxb.20193069.

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