GhEIN3基因对棉花枯萎病胁迫响应的功能分析  

Functional analysis of GhEIN3 gene in response to cotton Fusarium wilt stress

作　　者：赵曾强 张析[1] 李潇玲[1] 张薇[1] Zhao Zengqiang;Zhang Xi;Li Xiaoling;Zhang Wei(College of Agronomy,Shihezi University,Shihezi,Xinjiang 832000,China;Biotechnology Research Institute,Xinjiang Academy of Agricultural Reclamation Sciences,Shihezi,Xinjiang 832000)

机构地区：[1]石河子大学农学院,新疆石河子832000 [2]新疆农垦科学院生物技术研究所,新疆石河子832000

出　　处：《棉花学报》2022年第3期173-186,共14页Cotton Science

基　　金：国家自然科学基金(31260358,31560407)。

摘　　要：【目的】乙烯(ethylene,ET)不敏感蛋白3(ethylene-insensitive 3,EIN3)/EIN3-like(EIL)家族基因是乙烯通路中的关键基因,参与植物生物胁迫响应。探究其功能可为解析陆地棉对枯萎病菌的响应机理提供依据。【方法】从枯萎病菌诱导棉花根部基因表达谱数据中筛选并从TM-1基因组数据库中鉴定获得EIN3/EIL基因家族的GhEIN3基因,利用生物信息学、实时荧光定量聚合酶链式反应技术和病毒诱导的基因沉默(virus-induced gene silencing,VIGS)技术分别分析基因序列、不同处理下的表达特征及GhEIN3基因在棉花抗病过程中的作用。【结果】GhEIN3基因(Genbank登录号:KY744279)开放阅读框为1842 bp,编码的氨基酸序列中含有典型的EIN3蛋白结构域。枯萎病菌胁迫和不同外源激素ET、水杨酸(salicylic acid,SA)和茉莉酸(jasmonic acid,JA)处理后,该基因受枯萎病菌胁迫和ET诱导上调表达,而受SA和JA诱导下调表达;当GhEIN3基因沉默后,对沉默植株进行枯萎病菌接菌试验,结果显示,与对照相比,沉默GhEIN3基因的株系更感病;基因表达量测定结果表明,与对照比较,沉默株系中病程相关基因PR1、PR2、PR4的表达量均下降,乙烯响应因子基因ERF1和1-氨基环丙烷-1-羧酸氧化酶基因ACO的表达量下降,而PR5基因的表达量上升。【结论】从陆地棉中鉴定出的EIN3/EIL家族基因GhEIN3能够响应枯萎病菌和外源激素ET、SA、JA诱导,结合枯萎病菌、ET、SA与JA诱导后GhEIN3基因表达情况,以及枯萎病接种试验和VIGS结果认为,GhEIN3基因在棉花抗枯萎病的过程中起积极作用。[Objective]Ethylene(ET)insensitivity protein 3(EIN3)/EIN3-like(EIL)family genes are key genes in ethylene pathway,which are involved in the biological stress response of plants.Its function was studied to provide a basis for analyzing the response mechanism of upland cotton to Fusarium wilt.[Method]GhEIN3 of EIN3/EIL gene family were selected from TM-1 genome database based on the data of gene expression profile from root infected with cotton Fusarium wilt in our laboratory.The gene coding protein and related sequence information were analyzed by bioinformatics methods,and the expression pattern of GhEIN3 in Fusarium wilt and different hormone treatments were analyzed by real-time fluorescent quantitative polymerase chain reaction(qRT-PCR).The role of GhEIN3 in disease resistance was preliminarily analyzed by virus induced gene silencing(VIGS)technique.[Result]A new gene GhEIN3 was isolated from upland cotton(Genbank accession:KY744279),which was from EIN3/EIL family.Bioinformatic analysis showed that the open reading frame of this gene was 1842 base pairs.The encoded amino acids sequence contains a typical EIN3 domain.After Fusarium oxysporum f.sp.vasinfectum(FOV)and different exogenous hormones ET,salicylic acid(SA)and jasmonic acid(JA)treatment,the expression of GhEIN3 was up-regulated by FOV and ET induction,but down-regulated by SA and JA induction.The VIGS results showed that the GhEIN3 gene silenced plants were more susceptible to FOV than the control.The results of gene expression analysis showed that compared with the control,the expression levels of pathogenesis-related genes PR1,PR2,and PR4,ethylene response factor gene ERF1 and 1-aminocyclopropane-1-carboxylate oxidase gene ACO were decreased,while the expression level of PR5 gene was increased after GhEIN3 gene silencing.[Conclusion]A EIN3/EIL family gene GhEIN3 identified from G.hirsutum responds to Fusarium wilt and hormones ET,SA and JA induction.Combined the GhEIN3 gene expression analysis of the cotton plants under ET,SA,JA and FOV treatments wi

关 键 词：GhEIN3 陆地棉 枯萎病 转录因子 基因功能 病毒诱导的基因沉默 表达分析 

分 类 号：S435.621.24[农业科学—农业昆虫与害虫防治]