1-MCP处理对小白菜采后生理特性与品质的影响分析

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1、ABSTRACTTwopakchoicultivarsof‘Shanghaiqing’and。siyueman‘wasusedinthisexperimenttostudytheactivityofSOD，POD?CATandAPX，thecontentofmalondialdehyde(MDA)，solubleprotein，chlorophyllandglucosinolates，theconductivity，weight-lossrateduringstorageatdifferentte

2、mperature．ThiswillbeusefultoofferatheoreticalbasisfortheuseofI-MCPinpreservationofpakchoi．Theresultsshowedthat1．Duringstorageat25*Cor49C，SODactivitydecreasedatfirst，andincreasedsecondlyanddecreasedatlastinbothof‘shanghaiqing’and‘siyueman’．Theactivityo

3、fCATandPODincreasedatfirstandthendecreased．howevertheAPXactivitydecreasedgradually．I·MCPtreatmentinhibitedthedecreaseofSOD，CAT,APXandPODactivity．Theeffectof1BL／L1-MCPtreatmentoninhibitionofSODactivityreductionwassignificantlybetterthanthatofO．5uL／L1·M

4、CPtreatmentfP<0．05)at4℃．However,theireffectonCATactivityin‘Siyueman‘wasopposite．2．At25"Cor4。C，thetWOvarietiesofMDAcontent，theweight·lossrateandelectricalconductivityallshowedatrendofincrease．andtheirlevelsforstorageat4。Cwerelowerthanthatofstorageat25"

5、C．1-MCPCallinhibittheincreaseofMDAcontent．weight·lossrateandelectricalconductivity．TheeffectofO．5pL／L1-MCPtreatmentoninhibitionofconductivityincreasewasbetterthanthatof1LLL几1一MCPtreatmentin‘Shanghaiqing’，howeveritwasoppositefor‘Siyueman’．Thevariationo

6、fMDAcontentswasnotsignificantlydifferencebetweentwotreatmentsof1-MCPat25℃or4℃．Thecontentofsolubleproteinandchlorophyllshowedatrendofdeclining，andbothofthemdecreasedmoreslowlyat4"Cthanthatof25℃．I-MCPcouldeffectivelyinhibitthedecreaseofsolubleproteinand

7、chlorophyllcontentforbothcultivarsDifferentconcentrationof1·MCPtreatmentshowednosignificantdifferenceofsolubleproteincontent．But1-MCPconcentrationhadinfluenceonthechlorophyllcontentof‘Shanghaiqing‘，butnoeffecton‘Siyueman’3．WhentreatedwithO．5UL／LI-MCPa

8、t25"C，theglucosinolatecontentof‘Shanghaiqing’increasedatfirstandthendecreased．Theeffectof0．5uL／L1-MCPtreatmentonkeepmentofglucosinolatecontentin。Shanghaiqing‘wasmuchbetterthanthatof1pL／Ll-MCPtreatment．TheIIABSTRACTglucosinolatecontentof‘Siyuem