1、河南大學碩士學位論文鈣與赤霉素混合浸種增強小麥抗旱性的機理研究姓名：王磊申請學位級別：碩士專業(yè)：植物學指導教師：山侖吳冬秀20040501布弓1牙月長習今，曰硯卜i巨種增主雖寸.A眨生憶潤卜吸生白勻書男且布開究AbstractThe47to52.5percentofChineseterritorybelongstoandorsemiaridarea.Thedamageofdroughttocropisthemostseriousinal

2、lnonbiologicalstressanditisjustinferiortothedamagebroughtbyplantdiseasesandpests.Studyingandpopularizingchemicalwatersavinganddroughtresistingtechnologyisanefectivemethodtodefendthedrought.Thepreviousresearchshowedthatse

3、edsoakingtreatmentwiththemixtureofcalciumchloride(CaC12)andgibberellin(GA)couldpromotetheseedsgerminationandseedinggrowthunderdroughtcondition.ThereasonisthatthemixtureapplicationofCaandGAplayedanintersupplementroleinbot

4、hmetabolismandgrowthofcrops.Theauthortreatedtheseedofwinterwheat(TriricumaestivumL.yumai49)withthemixtureofcalciumchloride(CaCl2)andgibberellin(GA)tofindthemechanismofenhanceddroughtresistanceofthisseedsoakingtreatmentby

5、investigatingthecontentofosmoticadjustmentmaterandtheactivityofantioxidativesystemundersimulativedroughtconditionwith20percentsPEG6000solution(osmoticpotentialis0.59MPa).Thepresentexperimentshowedthatcalciumchloride(CaC1

6、2)hasntsignificantpositiveefectontheseedsgerminationunderdroughtstress.Butitsignificantlyincreasedthesolubleproteincontentintheembryofromthefirstdayaftersowingtothefifthday.Thesesolubleproteinsperh即splayimportantroleasth

7、eosmoticadjustmentmaterandthedroughtinducedprotein.Thegerminationofthewheatsseedunderdroughtstresswassignificantlyincreasedwhensoakedwith50mgLgibberellin(GA).Itcanbecontributedtothemaintenanceoftougorpressureandenergywhi

8、chembryoneedssinceproandsolubleproteincontentintheembryoaswellastheproandsolublesugarcontentintheendospermwereallincreasedinthistreatment.Theseedsoakedwith0.5%CaC1250mgLGAalsoshowedmarkedlyincreasedgerminationunderdrough

9、tstressandtheshootgrowthsignificantlyincreasedbyreducingtherootshootratiointheninthday.Ca“IGAseedsoakingandGAseedsoakingshowedsimilarmechanisminpromotingthewheatseedlingdroughtresistance.Theybothenhancedwheatseedlingdrou