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1、河南大學(xué)博士學(xué)位論文擬南芥活性氧應(yīng)答基因的轉(zhuǎn)錄調(diào)控分子機(jī)制研究姓名：王鵬程申請(qǐng)學(xué)位級(jí)別：博士專(zhuān)業(yè)：植物學(xué)指導(dǎo)教師：宋純鵬20100501菊臼霄芥活性竄■立答基因的轉(zhuǎn)景謾控分子機(jī)制研究AbstractReactiveoxygenspecies(ROS)hasbeencharacterizedasallimportantsignalmoleculethatmediatesmanydevelopmentalandphysiologicalpr

2、ocessesinplants，whichincludebioticandabioticstressresponses，stomotalmovemem，programmedcelldeath，growthanddevelopmentROSalsoplaysaglobalroleingenetranscriptionSofardetailsoftheROSresponsivetranscriptionalnetworkarestillla

3、rgelyunknownTogaininsightintothecoordinationofgeneexpressionprofilesunderabscisicacid(ABA)andH202applications，globalchangesingeneexpressioninresponsetoABAandH202inArabidopsisseedlingswereinvestigatedbymicroarrayanalysis4

4、59transcriptswerefoundtObesignificantlyincreased，whereasanother221decreasedfollowingH202treatmentcomparedwithcontr01TheseresultssuggesttheglobalroleofH202ingenetranscriptionThetranscriptionalresponsesinducedbytheapplicat

5、ionofexogenousABAandH202overlappedsubstantiallyPromotersofROSupregulatedgeneswereselectedforabioinformaticssearchtoidentifythepotentialtranscriptionfactorbindingsitesresponsibleforROSinducedgeneexpression，andfourofeightp

6、otentialROSresponsiveciselements(ROEs)aresufficienttoconferarapidincreaseofluciferaseunderH202andMVtreatmentindicatedtheirrolesinROSresponsivegenetranscriptionWealsofoundthatanAP2／EREBPtranscriptionfactorERF6couldbindtOt

7、heROE8speciallyCoexpressionofERF6effectorenhancedtheexpressionofROE8driverluciferasegene，wealsofoundthatERF6interactedphysicallywithMPK6invitroandinvivo，andalsoservedasasubstrateofMPK6TwoSerresiduesSer266andSer269werethe

8、putativephosphorylationsiteofERF6AfterapplicationofH202，phosphorylationbyMPK6，ERF6relocalizesfromcytoplasmtOthenucleusExpressionofROSresponsivegenesisstronglyupregulatedin35SERF6盱and35SERF6wtransgenicplantsFurthermore，gr

9、owthsof35S—ERF6WTand35S—ERF6DDseedlingsaremoresensitivetOH202treatmentthanWTor35SERF6州transgenicplantsImmunoprecipitationresultsindicatedthatH202treatmentandSStODDmutationalsoincreasedthestabilityofERF6MPK6complexBasedon

10、thoseresults，theMPK6ERF6pathwayhasestablishedthatitmediatedtheROSresponsivetranscriptionandseedlinggrowthregulationInthisworkH202responsivegenetranscriptionWascomparedatgenomicrangesandpotentialROSresponsiveciselementswe

11、reidentifiedThefunctionofROE8bindingproteinERF6incontrollingtheROSresponsivegeneexpressionWasalsocharacterizedWefoundthatH202responsivegeneexpressionpartlydependentonROS—MPK6ERF6pathwayThesedatamayprovidenewinsightintOSr

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