Exogenous Salicylic Acid Alleviates Zinc-induced Oxidative Damage in Tomato Plants

摘要

Inthepresentstudy,theeffectsofZinc(Zn)andsalicylicacid(SA)interactionontomatoplantswereexamined.25-day-oldtomatoplantsweresubjectedtodifferentconcentrationsofZnSO4.7H2O(0,250,500μM)andSA(0,100μM)for10days.ZnwasaccumulatedinrootsandshootsofZn-stressedplants.TreatmentwithZnreduceddryweightofrootsandshootsanddecreasedchlorophyllcontentinleaves.InZn-treatedplants,Malondialdehyde(MDA),H2O2andprolinecontentssignificantlyincreasedinleaves.Moreover,changesintheactivitiesoftheantioxidantenzymes,catalase,guaiacolperoxidase,ascorbateperoxidaseandsuperoxidedismutaseinleavesindicatedthatZncausedanoxidativestressintomatoplants.InZn-stressedplants,applicationofSAreducedroot-to-shoottranslocationofZnandenhancedgrowthandchlorophyllcontent.AddingofSAinthenutrientsolution,increasedtheantioxidantenzymesactivitiesanddecreasedtheleveloflipidperoxidation,H2O2andprolineaccumulationinleavesofZn-treatedplants.Asaresult,SAbysequestrationofZninrootsandincreaseintheactivitiesofantioxidantenzymes,considerablydecreasedZninducedoxidativedamageontomatoplants.