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ID:9048058
大小:1.37 MB
页数:14页
时间:2018-04-15
《番茄漆酶基因lelacmir397的克隆与表达分析》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、园艺学报,2015,42(7):1285–1298.ActaHorticulturaeSinicadoi:10.16420/j.issn.0513-353x.2014-1079;http://www.ahs.ac.cn1285miR397番茄漆酶基因LeLAC的克隆与表达分析*赵先炎,庞明利,赵强,任怡然,郝玉金,由春香(山东农业大学园艺科学与工程学院,作物生物学国家重点实验室,国家苹果工程技术研究中心,山东泰安271018)摘要:通过BLAST分析,获得了番茄漆酶(Laccase,LAC)基因相关的15个EST片段,并对这些EST进行了同源比较和序列拼接
2、,得到1个含有小分子RNAmiR397识别位点的LAC片段,命名为miR397miR397miR397LeLAC。根据蛋白质结构域推测,LeLAC蛋白存在1个Cu–氧化酶结构域。LeLAC时空表达分析表明,其在番茄根、花、成熟果实和愈伤组织中特异性表达,而在叶中不表达。根据该片段的核苷miR397酸序列信息进行5′-和3′-RACE扩增,得到了番茄LAC基因的全长cDNA(LeLAC,登录号EU503151),其在番茄基因组中对应的基因为Solyc07g049460.2.1。通过在番茄中过表达miR397a基因,发现转基因番miR397茄中LeLAC表达量
3、降低,同时其PPO、POD、SOD含量也有所下降。用丁香酸和芥子酸处理转基因miR397植株幼苗,其根系比非转基因植株更长,抗性增强,表明LeLAC与番茄植株的抗性反应有关。关键词:番茄;漆酶;LAC;克隆;抗性中图分类号:S641.2文献标志码:A文章编号:0513-353X(2015)07-1285-14miR397CloningandExpressionAnalysisofTomatoLeLACGene*ZHAOXian-yan,PANGMing-li,ZHAOQiang,RENYi-ran,HAOYu-jin,andYOUChun-xiang(St
4、ateKeyLaboratoryofCropBiology,NationalResearchCenterforAppleEngineeringandTechnology,CollegeofHorticultureScienceandEngineering,ShandongAgriculturalUniversity,Tai’an,Shandong271018,China)Abstract:Laccasesareglycoproteinswithpolyphenoloxidaseacitivitydependingoncopper.Theyubiquitou
5、slyexistinplants,fungi,insects,bacteriaandotherorganisms,playingcrucialrolesinligninsynthesis,ionabsorptionandstressresponses.IthasbeendocumentedthatseveralLACgeneswereregulatedbymicroRNAsatpost–transcriptionallevel.Inthisstudy,homologyBLASTwasconductedinGenBankforLACESTs.Resultly
6、,15tomatoESTshighlysimilarwithLACgeneswereobtained,andmiR397splicedintoaLACfragmentnamedasLeLACcontainingarecognitionsiteofmiR397.Inaddition,amiR397Cu-oxidasedomainwaspredictedtobeinthededucedLeLACprotein.TocheckthetemporalandmiR397spatialexpressionofLeLAC,semi-quantitativeRT-PCRw
7、asperformed.ItwasfoundthatmiR397LeLACspecificallyexpressedinroots,flowers,ripefruitandcallus,butnotinleaves.Then,itsfulllengthcDNAwasclonedwithRT-PCRand5′-and3′-RACEs,andregisteredasEU503151inGenBank,miR397correspondingtoSolyc07g049460.2.1intomatogenome.ThedatashowedthatLeLACexpre
8、ssionwasdown-regulatedinthetransg
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