The WRKY70 transcription factor of Arabidopsis

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1、Planta(2007)226:125–137DOI10.1007/s00425-006-0474-yORIGINALARTICLETheWRKY70transcriptionfactorofArabidopsisinXuencesboththeplantsenescenceanddefensesignalingpathwaysBekirÜlker·M.ShahidMukhtar·ImreE.SomssichReceived:25September2006/Accepted:21December2006/Publishedonline:20February2007©Sprin

2、ger-Verlag2007AbstractRegulatoryproteinsplaycriticalrolesinanddefensesignalingpathways.Thesestudiescouldcontrollingthekineticsofvariouscellularprocessesformthebasisforfurtherunravelingofthesetwocom-duringtheentirelifespanofanorganism.Leafsenes-plexinterlinkedregulatorynetworks.cence,aninteg

3、ralpartoftheplantdevelopmentalprogram,isWne-tunedbyacomplextranscriptionalKeywordsAtwrky70mutants·Dark-inducedregulatorynetworkensuringasuccessfulswitchtothesenescence·Salicylicacid·Signalingcrosstalkterminallifephase.Toexpandourunderstandingonhowtranscriptionalcontrolcoordinatesleafsenes-A

4、bbreviationscence,wecharacterizedAtWRKY70,ageneencodingaETEthyleneWRKYtranscriptionfactorthatfunctionsasanegativeJAJasmonicacidregulatorofdevelopmentalsenescence.TogaininsightSASalicylicacidintotheinterplayofsenescenceandplantdefensesig-nalingpathways,weemployedacollectionofmutants,allowing

5、ustospeciWcallydeWnetheroleofIntroductionAtWRKY70inthesalicylicacid-mediatedsignalingcascadesandtofurtherdissectthecross-talkofsignalLeafsenescence,constitutingtheterminalstageofleaftransductionpathwaysduringtheonsetofsenescencedevelopment,isatypeofprogrammedcelldeathinArabidopsisthaliana.O

6、urresultsprovidestrong(PCD)andismanifestedbyalossofchlorophyllthatevidencethatAtWRKY70inXuencesplantsenescenceoccursduringchloroplastdisassemblytogetherwithothercataboliceventssuchasprotein,lipidandnucleicacidsdegradation(Quirinoetal.2000;Gepstein2004).B.Ülker·M.ShahidMukhtar·I.E.Somssich(&

7、)Leafsenescenceisregulatedbybothintrinsicandenvi-MaxPlanckInstituteforPlantBreedingResearch,ronmentalsignals,withanumberofphytohormonesAbteilungMolekularePhytopathologie,andgrowthregulatorssuchascytokinins,abscisicacid,Carl-von-Linné-Weg10,50829Cologne,G