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PEG浸种对低温弱光下辣椒幼苗生理生化的影响.docx

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PEG浸种对低温弱光下辣椒幼苗生理生化的影响 Title:EffectsofPEGPrimingonthePhysiologicalandBiochemicalAspectsofPepper(CapsicumannuumL.)SeedlingsunderLowTemperatureandWeakLightConditions Abstract: TheaimofthisstudywastoinvestigatetheeffectsofPEG(polyethyleneglycol)primingonthephysiologicalandbiochemicalaspectsofpepper(CapsicumannuumL.)seedlingsunderlowtemperatureandweaklightconditions.PrimingwithPEGhasbeenwidelyusedtoimproveseedgerminationandseedlinggrowthundervariousstressconditions.Inthisstudy,pepperseedswereprimedwithPEGsolutionsofdifferentconcentrationsandsubsequentlysubjectedtolowtemperatureandweaklightconditions.Thegerminationrate,seedlinggrowth,physiologicalparameters(chlorophyllcontent,prolinecontent,andenzymeactivities),andbiochemicalparameters(lipidperoxidationandantioxidantenzymeactivities)weremeasured.TheresultsshowedthatPEGprimingenhancedthegerminationrateandseedlinggrowthofpepperunderlowtemperatureandweaklightconditions.Furthermore,PEGprimingsignificantlyincreasedthechlorophyllcontentanddecreasedlipidperoxidation,indicatingimprovedphotosyntheticefficiencyandreducedoxidativestress.Additionally,PEGprimingledtoincreasedprolineaccumulationandenhancedactivitiesofantioxidantenzymes,suchassuperoxidedismutase(SOD),catalase(CAT),andperoxidase(POD).ThesefindingssuggestthatPEGprimingimprovesthetoleranceofpepperseedlingstolowtemperatureandweaklightconditionsbyenhancingphysiologicalandbiochemicalresponses.FurtherstudiesareneededtoelucidatethemolecularmechanismsunderlyingPEG-mediatedstresstoleranceinpepperseedlings. Introduction: Pepper(CapsicumannuumL.)isanimportanthorticulturalcropworldwide,knownforitseconomic,nutritional,andmedicinalvalue.However,pepperproductionisoftenlimitedbyvariousabioticstresses,includinglowtemperatureandweaklightconditions.Lowtemperatureaffectsseedgermination,seedlinggrowth,andoverallplantdevelopment,leadingtosignificantyieldlosses.Weaklightconditions,suchasshadedenvironments,canalsonegativelyimpactplantgrowthanddevelopmentbyreducingphotosyntheticefficiencyandalt