硅影响大葱产量品质形成的生理机制分析

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1、万方数据山东农业大学硕士学位论文AbstractAsanacceptedandbeneficialelement，siliconplaysanimportantroleinimprovingcropyieldandquality,buttheresponseofChinesespringoniontosiliconhadnotbeenreported．Therefore，UndertheconditionofNa2Si03‘9H20asutilizedsiliconsource，twovarietiesofChinese

2、springonion，‘Tianguang’and‘Zhangqiu’，weretakenasmaterialstoinvestigatetheeffectsofdifferentsiliconlevelsofnutrientsolution(0,0．6，1．2，1．8mmol／L)andsoilsiliconfertilizers(0，10，20，30kg／667m2Si02)respectively,onplantgrowth，yieldandquality，andotherphysiologicalcharact

3、eristicsbycombiningpotHoaglandnutrientsolutioncultureandfieldcultivation．inthisexperiment．Thechiefresultsareshowedasfollows：1．Theresultsshowedthatplantheight，cauloidlength，cauloiddiameter,dryweightofthetwovarietiesfirstlyincreasedandthendecreasedintherangeof1．8mm

4、ol／Lsilicon．Amongalltreatments，1．2mmol／LsiliconWasthebest，andthesingleplantyieldsofthetwovarietieswereimprovedby19．41％and30．85％respectivelycomparedwiththecontrolandinthetreatmentof1．8mmol／L，thetwovarietieswereimprovedby12．31％and22．79％．Inthefieldexperiment，atthetr

5、eatmentofsupplying20kg／667m2silicon(Si02)，theyieldsof‘Tianguang’and‘Zhangqiu’werethehighestandincreasedby15．43％and25．69％comparedwiththecontr01．Moreover,appropriatesiliconalsosignificantlyincreasedthecontentsoffreeaminoacids，solublesugar,pyruvicacidofChinesespring

6、onion，whichindicatedthatChinesespringonionqualitycouldbeenhancedbyapplyingsilicon．2．ApplyingsiliconCanincreasechlorophyllandcarotenoidconrentofChinesespringonionandenhancelightutilizationefficiencyofplant．Amongalltreatments，1．2mmol／LsiliconWasthebest，thephotosynt

7、heticrateof‘Zhangqiu’varietyWashigherthanthatof‘Tianguang’．Moreover，appropriatesiliconalsosignificantlydecreasedthetranspirationrateofthetwovarietiesand1．8mmol／LsiliconWasthelowest，weredecreasedby23．45％and25．86％．Underhightemperatureofsummer,thetwovarietieshadshow

8、ednoonbreak，bututilizedsiliconimprovedFv／Fm、(ppsIIofChinesespringonionleavesanddecreaseNPQSOthatreducednoonbreakphenomenonandpromotetheproductionandaccumulatio