江蘇稻瘟菌變異動態(tài)及水稻品種抗瘟基因型推導.pdf

1、南京農業(yè)大學碩士學位論文江蘇稻瘟菌變異動態(tài)及水稻品種抗瘟基因型推導姓名：王躍申請學位級別：碩士專業(yè)：農業(yè)推廣植物保護指導教師：劉鳳權陳志石20100601英文摘要ABSTRACTRiceblastcausedbyFungusascomycetes，Magnaporthegn。sea(Hebert)Barr(asexualstate，PyriculafiaggdseaSacc)wasallimportantconstraintfactor

2、ofriceproductionatlargericeplantedareasintheworldThepracticeprovedthatbreedingandpromotingresistancevarietieswasthemosteconomicalandeffectivemeasurestocontrolthediseaseStudyingpopulationstructureofficeblastfungusanditsdy

3、namicsruleWasanimportantbasisinbreedingandpromotingdiseaseresistantvarietiesTheresultsofidentifAngphysiologicalracesofficeblastpathogenfrom1998to2007ofJiangsuandanalyzingthefrequencyofresistantgenesbytwosetsofidentificat

4、ionspecies(respectivelyChinaandJapan)indicatethatChineseracesZGI，ZFIandZE3aresuperiorityraces；Japaneseraces301，701and001aresuperiorityraces；superiorityracesarerelativelystableinthetenyears，buttherewereafewnewraces，conseq

5、uentlythecomponentofracesiscomplex；theovercomefrequencyofantiriceblastfungusgenes，Piks、Pish、Pi—ta、Pita2、PiKpandPiKmis60％l00％andtheyhavebasicallylostvaluewhenalone；thefrequencyis5％～15％toPii，Pi—zandPikh，andtheyarethemainge

6、nesinresistingriceblastfungusandbreedingChangesanddynamicanalysisastoRiceblastpathogenphysiologicraceandthefrequencyofresistantgenesovercomeinthetenyearsindicatethatChineseraceZGIisthemainsuperiorityraceinJiangsu，butitsp

7、resentfrequencywaslowerin2004，2006and2007，andZF1roseintothemainsuperiorityrace；ZE3orZE1aregenerallythesecondarysuperiorityrace，anditspresentfrequencyinferiortoZG1；thevulnerablegroupisZAraceThenumberofJapaneseracesislarge

8、rbutthesuperiorityracesareobvious，301occupyadominantpositionhoweverbigfluctuationexist；701，001and000arethesecondarysuperiorityraces，butthepresentfrequenciesof701and001arerespectively286％and258％Surpassing301in2005，andthey

9、roseintothemainsuperiorityraces111efrequencyofantiriceblastfungusgenesovercomealsohascertaindifferenceintheyearthefrequencyofPi—ks，Pi—sh，Pi—ta，Pi—kp，Pikm，Pi—ta2overcomeisalwaysinthehighlevel；howeverthefrequencyofPiaPi19(

10、t)overcomesharplydeclined，from5321％of1998to579％of2007；thefrequencyofPibovercomeupwardtrend；thefluctuationisbigtoPi—zandPi—zt；thefrequencyisalwayslowertoPii，Pi—ZandPikhTheresistancegeneof337ricevarietiesticeblastwereident