籽用南瓜疫病苗期抗性鑒定方法及抗病材料篩選的研究.pdf

1、東北農(nóng)業(yè)大學(xué)碩士學(xué)位論文籽用南瓜疫病苗期抗性鑒定方法及抗病材料篩選的研究姓名：周克琴申請學(xué)位級別：碩士專業(yè)：蔬菜育種指導(dǎo)教師：崔崇士2001.5.1碩士學(xué)位論文籽用南瓜疫病苗期抗性鑒定方法及抗病材料篩選的研究東北農(nóng)業(yè)大學(xué)IdentificationandscreeningontheresistancetosquashblightinseedingstageAbstractSquashblightisasoilspreadingdisea

2、secausedbyPhytophthoracapisici.Itisoneofdiseaseswhichputthemostthreatonthesquashproduction.Theinfluenceof尸capisiciaffectingtheseedlingsquashinoculatedbytheinoculatingmethodofzoosporeseedlingsquashinoculatingsuchasinocula

3、tiondensityinoculatingwayseedlingstagesandpreservingmoisturetimewasstudiedinthispaper.Theresultsshowed:l.Inoculatingdensityisdesigned8levelsbysettingupthefigureandthetablebetweentheinoculatingdensityanddiseaseitisfoundth

4、attherangeofcomparativelysuitableinoculatingdensityis12507500sporemlandthemostappropriatedensityis5000sporeml.2.Itisfoundthatthebestseedlingstageis2leavescomparing4seedlingstage.3.Thereare3inoculatingways.Awaythempouring

5、therootisthemostsuitableinjectingcausesthediseasequicklyandseriouslycuttingrootgivestheplantsinjuryandafectsthegrowth.4.Preservingmoisturetimehasgreatinfluenceoninfection.Butifthetimeistooshortsymptomcannotbeenshowedcomp

6、letelyandifthetimeistoolongthenormalgrowthofseedlingwillbeaffected.Afterinoculatingthebesttimetopreservemoistureis48hrafter72hrtheinvestigationcanbedesignedwhenthereisahighinfectingrateandastablesymptom.5.Onthebasisofthe

7、aboveresearchatestwascarriedontoidentifythediseaseresistanceof29samplesandsomeplantswithdiseaseresistancewereselected.6.ByL9(34)preservingmoisturetimeistestedtobeakeyfactorthataffectsinoculatingefectanditdecidestheinfect

8、ingdegree.7.ResistanceisdirectiverelevanttoPODandPPOaccordingtotheanalysisesofenzymeactivatingofsquashmaterialwithdiferentresistancePPOinresistantmaterialhasahigheractivitythaninfectingmaterialafterinoculating.Graduate:Z