Biochemical and Physiological Responses of Pterocarya stenoptera and Taxodium ascendens Saplings to Different Configuration Modes and Water Regimes

ThreedifferentkindsofwatertreatmentandtwoconfigurationmodeswereappliedtoexaminethebiochemicalandphysiologicalresponsesofP.stenopteraandT.ascendenssaplingsundersimulatedvegetationoftheHydro-fluctuationBeltoftheThreeGorgesReservoirRegion.Thewatertreatmentswerenormalgrowthwatercondition(CK),lightdroughtwaterstress(LD)andwatersubmersion(SM).Thefirstconfigurationmodewas3P.stenopteraand6T.ascendens,andthesecondwasareverseofthenumberofsaplingsofbothspecies.Theresultsshowedthatdifferentconfigurationmodescouldnotsignificantlyinfluencethephotosyntheticpigment,SOD,POD,CAT,ASP,O2？―,prolineandsolubleproteinofthetwospecies.Incontrast,differentwatertreatmentandtimehadsignificantinfluencesonSOD,POD,CAT,ASP,O2？―andsolubleproteinofthetwospecies.Theinteractionofconfigurationmodesxwatertreatment,configurationmodesxtime,configurationmodesxwatertreatmentxtimehadnosignificantinfluenceonphotosyntheticpigment,SOD,POD,CAT,ASP,O2？―andsolubleproteinofthetwospecies.However,theinteractionofwatertreatmentxtimehadsignificantinfluencesonSOD,POD,ASPandO2？―ofP.stenoptera,aswellasonSOD,CAT,ASPandprolinecontentofT.ascendens.Ourstudyshowedthatbothspecieshadtosomeextentdifferentbiochemicalandphysiologicalresponsestowaterstress,andwererelativelywell-adaptedtothedynamichydrologicalenvironmentinthehydro-fluctuationbeltoftheThreeGorgesReservoirRegion.