枇杷果實冷害及其抗冷性誘導(dǎo)機(jī)理的研究.pdf

1、集美大學(xué)碩士學(xué)位論文枇杷果實冷害及其抗冷性誘導(dǎo)機(jī)理的研究姓名：張曉勇申請學(xué)位級別：碩士專業(yè)：食品科學(xué)指導(dǎo)教師：陳發(fā)河20080701IIStudiesonchillinginjurymechanismofinducingchillingtoleranceinloquatfruitsAbstractLoquatasubtropicaltreeiginatesintheregionsofSouthernChina.Theloquatfrui

2、tsaredeliciousnutrition.Nowthemainstagetransptwayofloquatfruitsiscoldstage.Lowtemperatureisefficiencytoinhibittheirdecaybutitalsocauseschillinginjury.Indertostudytheapproachestoreducechillinginjuryloquatsweretreatedbypos

3、tharvestheattreatmentat38℃f15hoursthechillinginjurythemechanismofinducingchillingtolerancebyheattreatmentwerefocuson.Theexperimentsobservedphysiologicalchangesactivityofenzymesmeasuredthemetabolizationofganicacidchangeso

4、fproteinsynthesization.italsoevaluatedthequalitybyTPAanalysesobservedthemicrostructurebyparaffinsectionmethods.Postharvestheattreatmentat38℃f15hoursreducedchillingsensitivity.Thechillingindexoffruitsafterheattreatmentwas

5、lessthanthatofcontrol.Heattreatmentcanenhanceresistancetochillinginjuryofloquatslightthedegreeofchillinginjury.HeattreatmentimprovedtheextractablejuiceratereducedtheweightlossraterespirationratethecontentofMDA.Italsoimpr

6、ovedtheactivityofPODSODreducingtheaccumulationofactiveoxygenspecieswhiletheactivityofPPOLOXwereinhibited.Preheatingimprovedantioxidantactivitiesreducedsensitivitytolowtemperaturereducedchillinginjury.Theganicacidsinloqua

7、tswerestudiedbyusinghighperfmanceliquidchromatographic.Theresultsshowedthatthereweremalicacidlacticacidoxalicacidtartaricacidcitricacidfumaricacidthemalicacidwasthetopganicacidinfruit.Heattreatmentcandelaythemetabolizati

8、onofganicacidmaintainsuitablesolidsacidrationhighleaveofVccontent.Preheatingcanalsokeeploquatfruitsbattertexturequality.Thechangesofproteinsynthesizationwererespondingtoadversitythreatening.Highproteincontentwascrelatedw

9、iththechillingtoleranceoffruits.Thehotinducedtheincreasingofproteinfrom17.0kDato95.0kDa.HeattreatmentcandelaythedeclineofTPAindexsuchashardnesscohesivenesschewinessetc.improvingthestagequalityofloquatfruits.Chillinginjur

10、yleadedtothedamageofcell.Microstructureshowedheattreatmentat38℃f15hoursimprovedtheintegralityofcellstructure.Thedamageofcellinfruitsafterheartingtreatmentislighterthanthoseincontroleffectivelylighteningchillinginjury.The