不同油菜品种对菌核病抗病性差异的生理生化分析

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1、thanweakpathogenicstrainWW2．Thisresultwasconsistentwiththeseedlingstage．TheactivityofCATwasshowingatrendthatdecreasedfirstandthenincreasedbothinresistantandsusceptiblevarietiesafterinoculation，resistantvarietieswerehigherthatofsusceptiblevarietiesandconsistentlylowert

2、hatofcontrol，resistantvarietiesdecreasedgreatlyandsusceptiblevarietiesdecreasedwithsmallchangeranges．StrongpathogenicstrainNG4inducedthereductionofCATactivityinalargerchangerangeweakpathogenicstrainWW2andreachedsignificantdifference．PALactivityoftheresistantandsuscept

3、iblevarietieswerebothincreasedandthendecreasedafterinoculatedwithstrongpathogenicstrainNG4，resistantvarietiesproducedtwowavecrests，susceptiblevarietieschangeslightly．PALactivityinresistantvarietiesincreasedearliersusceptiblevarieties，accumulatedmore．PALactivityofallfo

4、urvarietiesshowedatrendofincreasedandthendecreasedafterinducedwithweakpathogenicstrainWW2，buttherateofincreaseinresistantvarietieswasgreatersusceptiblevarieties．Itexplainedthatthereweredifferentresistancemechanismsofdifferentresistantvarietiesofoilseedrapetostrainsofd

5、ifferentpathogenicity．Chitinaseactivityofallvarietiesincreasedafterinoculation，resistantvarietiesrisefasterandlastforalongertimethesusceptibleones，resistantvarietiesreachedthewavecrestearlierthesusceptibleones，itexplainedthatSsclerotiorumwasabletoinducetheproductionof

6、chitinase．Therewasapositivecorrelationbetweenraperesistanceanditschitinaseactivity．ChitinaseactivityinducedbystrongpathogenicstrainNG4washigherweakpathogenicstrainWW2．InhibitionofchitinasetomycelialgrowthofS．sclerotiorum：chitinasecrudeenzymeextractedfrominfectedrapele

7、avescouldinhibitedmyceliumgrowthofS．sclerotioruminvitro．however,＆sclerotiorummycelialcontinuedtogrowthinthecontrolarea．ItshowedthatchitinasehadacertainantibacterialactivitytoSsclerotiorum．Keywords：Sclerotiniaselerotiorum；diseaseresistance；oxalicacid；biochemicalmechani

8、sm；IV目录摘要⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯．．IABSTRACT⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯III文献综述⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯