the response of plants to drought stress—the role of dehydrins, chaperones, proteases and protease inhibitors in maintaining cellular protein function

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1、45TheResponseofPlantstoDroughtStressChapterTheResponseofPlantstoDroughtStress:TheRoleofDehydrins,Chaperones,ProteasesandProteaseInhibitorsinMaintainingCellularProteinFunctionI.Vaseva,1J.Sabotič,2J.Šuštar-Vozlič,3V.Meglič,3M.Kidrič,2K.Demirevska,1andL.Simova-S

2、toilova1*Correspondingauthor,email:lsimova@mail.bg.1DepartmentofPlantStressMolecularBiology,InstituteofPlantPhysiologyandGenetics,BulgarianAcademyofSciences,Sofia,Bulgaria2DepartmentofBiotechnology,JožefStefanInstitute,Ljubljana,Slovenia3CropandSeedProduction

3、Department,AgriculturalInstituteofSlovenia,Ljubljana,SloveniaAbstractAbioticstresseswithadehydrationcomponent(drought,salt,andfreezing)involve,asacommonfeature,increasednumbersofinactiveproteins–denatured,aggregatedoroxidativelydamaged.Maintainingproteinsinth

4、eirfunctionalconformation,preventingaggregationofnon-nativeproteins,refoldingofdenaturedproteinstotheirnativeconformationandremovalofnon-functionalandpotentiallyharmfulpolypeptidesareallvitalforcellsurvivalunderdehydrationstress.Toachievethis,plantsrespondtod

5、roughtbysynthesisofprotectiveproteinssuchasdehydrinsandchaperonesandbydegradationofirreversiblydamagedproteinsbyproteases.Herewereviewtheimportantcellularfunctionsofdehydrins,chaperones,proteasesandproteaseinhibitors,togetherwiththeirroleintheresponsetodrough

6、t,thatmakethempotentialbiochemicalmarkersforassessingdroughttolerance.45TheResponseofPlantstoDroughtStress1.IntroductionDroughtisthemostwidespreadabioticstressintheplantworld.Itreducesyieldsandthreatensthesurvivalofmanyfieldcrops(Passioura,2007,Xoconostle-Cáz

7、aresetal.,2011).Thepossibilityofincreasingdroughttoleranceincropplantshasthereforebeenactivelypursued(Blum1996,Lafitteetal.,2007).Ofthevariousapproachesthathavebeenusedtoaddresstheproblem,plantbreeding,eitherconventionalorinvolvinggeneticengineeringisaneffect

8、iveandeconomicmeansoftailoringcropstogrowsuccessfullyinwater-sparseenvironments(Ashraf,2010).Fortheirexecution,however,suchapproachesrequirebasicknowledge,atthestructuralandmolecularlevel