¥767701中山大学硕士学位论文拟南芥Ferrodoxin基因与甜菜曲顶病毒(BCTV)作用机制的研究学位申请人姓名:姜威导师姓名及职称:谢旗教授专业:植物分子生物学答辩委员会委员(签名)主席谋V委员缎一一扒j谄鸟纭jj中山大学生命科学学院小国.广卅f:零零赢年五月摘要双生病毒(Germinivirus)是一组具有双生颗粒形态的单链环状DNA植物病毒,BCTV(Beetc”咖topvirus,甜菜曲顶病毒)是双生病毒II亚组的成员之一,双生病毒侵染范围十分广泛,感病植株一般表现为花叶、曲叶、黄化等症状,严重地影响了植物的正常生长,对农业生产造成巨大的危害。本研究以BCT7中的c2蛋白为诱饵,证明了在酵母双杂交体系中,有AP2,Ferrodoxin和SAMDC三个蛋白能够和C2蛋白发生相互作用。为了寻找c2蛋白和Ferrodoxin蛋白发生相互作用的具体结构域,本研究分别对c2蛋白和Ferrodoxin蛋白进行了N末端和C末端的切除,切除后的质粒重新共转化入酵母中,结果表明Ferrodoxin蛋白与C2蛋白发生作用的结构域分别为Ferrodoxin蛋白的C末端和C2蛋白的C末端。本研究还得到了高表达Ferrodoxin基因的拟南芥以及敲除Ferrodixn基因拟南芥。比较野生型拟南芥和高表达拟南芥的生长情况,可以看到高表达拟南芥比野生型拟南芥生长更快,植株更大。比较野生型拟南芥和高表达拟南芥的根的长短,可以观察到高表达拟南芥的根相对于同期野生型拟南芥的根更长,更发达。比较野生型拟南芥和高表达拟南芥的鲜重,高表达拟南芥要相对于野生型拟南芥的鲜重更重。因此可以得出结论:Ferrodoxin基因能够正向调节拟南芥的大小,根长以及鲜重。同时实验现象表明,高表达拟南芥的抽苔时间相对野生型拟南芥的抽苔时间有所推迟,说明高表达拟南芥的营养生长期被延长。用BCTV同时侵染高表达拟南芥和野生型拟南芥,计算拟南芥半数感染时间,野生型拟南芥的半数感染时间为十天,而高表达拟南芥半数感染时间是十三天。表明Ferrodoxin基因表达能够推迟拟南芥被BCTV感染后的症状。敲除Ferrodoxin基因拟南芥子叶相对于野生型拟南芥子叶会发生形态会发生改变,例如植株的对称性会发生变化,子叶会出现缺裂。由此可以说明,Ferrodoxin的表达量会影响拟南芥的予叶的形态。关键词:铁氧还蛋白,拟南芥,甜菜曲项病毒,酵母双杂交AbstractGeminivimsesvirionsdisplayingareafamilyofplantvirusesthatencapsidatecircularssDNAwithcanacharacteristicgeminatemorphology.Thegeminivirusesasinfectalargenumberofplantspecies,causingvarioussymptomssuchmosaicleaf,curlytopandetiolation,whichbadlyimpactthenormalgrowthofplantsandproducesignificantlossesinagriculturalproduction..BeetCUrlytopvirus(BCTV)usedinourresearchisamemberofsubgroupIIgeminiviruses.Basedonyeasttwo—hybddassayusingC2proteinofBCTVasabait,screenedbyproteins,ArabidopsisthalianacDNAlibrary,AtAP2,AtFerrodoxinandAtSAMDCrespectively,arefoundtOinteractspecificlywithC2protein.TofurtherexploretheinteractionbetweenBCTVC2andAtFerrodoxin,weusedtheyeasttwo—hybridsystemtoanalysewhethertheinteractionoccursattheNterminusorCterminusofBCTVC2andAtFerrodoxin,respectively.ThedeletionanalysisrevealedthattheC—terminalregionofBCTVC2interaclswiththeC—terminalofAtFerrodoxin.TofurtherexplorethefunctionofAtFerrodoxin,theAtFerrodoxinoverexpressionandknock—outtransgenicplantsaregenerated,respectively.Inthepriliminaryphenotypeanalysis,thetransgenicplantsofAtFerrodoxinoverexpressiongrowfasterandbiggersuggeststhanwildtypeaccordingAtFerrodoxintOthefleshweightandthelengthofroot,whichregulatethegrowthofArabidopsis.thatmaypositivelyMeanwhile,theboltingtimefoundtobelateroftheAtFerrodoxinoverexpressiontransgenicplantswasthanwildtype,suggestingthatthevegetativeperiodthewasdelayed.Agrobacteria-?mediatedspray—-inoculationassayindicatedthatBCTV-infectedsymptomsweredelayedduetOoverexpressionofAtFerrodoxin.Ontheotherhand,theshapeofcotyledonandthesymmetryofAtFerrodoxinknock—outtransgenicplantsarefoundtobeimpacted,suggestingtheexpressionlevelofAtFerrodoxinmayaffectmorphologyofArabidopsis.Keyword:Ferrodoxin,Arabidopsisthaliana,Beetc“rlytopvirus.YeasttwohybridⅡ缩略词与英汉对照缩写AmpAAbpcDNACMmMddH20DMSoEB最coliGAL4.ADGAL4一BDHisKanLBLeuLiOAcO.D.PEGS.cerevis/aeSDTBETETrpX-galYPDPCRkbCarEDTA全称AmpicillinAminoacidBasepaircomplementaryDNAcompletemediumMillimolarconcentrationdoubledistilledwaterdimethylsulfoxideethidiumbromideEscherichiacoliGAL4一ActivatingDomainGAL4一BindingDomainhistidineKanamycineLuda—BertanimediumleucineLithiumacetateOpticalDensitypolyethyleneglycolSacchromyces.cerevisiaeSDmediumTdsBorateEDl’ATdsEDTAtryptophan5.bromo-4一chloro?3-indoyl?B-D—galactosideYeastextract,Peptone,DextrosePolymeraseehainreactionKilobaseCart}encillinEthylenediaminetetraacetic乙二胺四乙酸汉语意思氨苄青霉素氨基酸碱基对与RNA互补的DNA完全培养基毫摩尔浓度双蒸水二甲基亚砜溴化乙锭大肠杆菌GAL4一(DNA转录)激活域GAL4.(DNA)结合域组氨酸卡那霉素LB培养基亮氨酸醋酸锂光学浓度聚乙二醇酿酒酵母SD培养基硼酸电泳缓冲液三羟基甲基氨基甲烷一乙二胺四乙酸色氨酸5.溴.禾氯.3.吲哚.B.D.半乳糖苷酵母提取物,大豆蛋白胨,葡萄聚合酶链式反式千碱基羧苄青霉素ⅣacidMurashigeandsaltmixtureSkoogbasalMS基本盐Rifampicin利福平V
拟南芥Ferrodoxin基因与甜菜曲顶病毒(BCTV)作用机制研究
2019-01-19 10:45
拟南芥Ferrodoxin基因与甜菜曲顶病毒(BCTV)作用机制研究.doc
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