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1、小麦慢白粉病QTL对条锈病和叶锈病的兼抗性111,23451,*刘金栋陈新民何中虎伍玲白斌李在峰夏先春123中国农业科学院作物科学研究所/国家小麦改良中心,北京100081;CIMMYT中国办事处,北京100081;四川省农业科学院作物研究所,45四川成都610066;甘肃省农业科学院小麦研究所,甘肃兰州730070;河北农业大学植物保护学院植物病理系,河北保定071001摘要:聚合兼抗白粉病、条锈病和叶锈病的慢病性基因,是培育持久多抗小麦品种的重要措施。百农64和鲁麦21均为慢白粉病品种,分别含有
2、4个和3个慢白粉病抗性QTL。将百农64与鲁麦21杂交,获得21个聚合2~5个慢白粉病抗性QTL的F6株系,于2012—2013年度分别在四川郫县和甘肃天水进行条锈病田间抗性鉴定,在河北保定和河南周口进行叶锈病田间抗性鉴定。分析21个株系条锈和叶锈病的最大严重度和病程曲线下面积,检测单个QTL和QTL聚合体对条锈病和叶锈病的抗性效应。结果表明,QPm.caas-4DL、QPm.caas-6BS和QPm.caas-2BL对条锈病均有显著的抗性,分别解释表型变异的16.9%、14.1%和17.3%;QPm
3、.caas-4DL对叶锈病也有显著抗性,可解释表型变异的35.3%;QPm.caas-1A/QPm.caas-4DL/QPm.caas-2DL/QPm.caas-2BS/QPm.caas-2BL和QPm.caas-1A/QPm.caas-4DL/QPm.caas-2BS/QPm.caas-2BL聚合体对条锈病和叶锈病的抗性显著高于两亲本,它们均含有来自百农64的QPm.caas-4DL以及来自鲁麦21的QPm.caas-2BL和QPm.caas-2BS,表明这些QTL具有明显的兼抗性效应。在小麦抗病育
4、种中,聚合慢病性QTL越多,慢病性越强,聚合4~5个慢病性QTL时,株系可达到高抗甚至接近免疫的水平,是选育持久抗性小麦品种的重要手段。关键词:普通小麦;慢病性;持久抗性;基因聚合;QTLResistanceofSlowMildewingGenestoStripeRustandLeafRustinCommonWheat111,23451,*LIUJin-Dong,CHENXin-Min,HEZhong-Hu,WULing,BAIBin,LIZai-Feng,andXIAXian-Chun12Insti
5、tuteofCropScience/NationalWheatImprovementCenter,ChineseAcademyofAgriculturalSciences(CAAS),Beijing100081,China;CIMMYT-China34Office,c/oCAAS,Beijing100081,China;CropResearchInstitute,SichuanAcademyofAgriculturalSciences,Chengdu610066,China;WheatResearch
6、5Institute,GansuAcademyofAgriculturalSciences,Lanzhou730070,China;DepartmentofPlantPathology,CollegeofPlantProtection,AgriculturalUniversityofHebei,Baoding071001,ChinaAbstract:Pyramidingquantitativetraitloci(QTLs)isaneffectivemethodtoimproveresistanceto
7、powderymildew,striperust,andleafrustincommonwheat.Wehavedeveloped21lines(F6)carrying2-5slowmildewingQTLsbycrossingslowpowderymildewcultivarsBainong64andLumai21possessingfourandthreeslowmildewingQTLs,respectively.TheseF6lineswereevaluatedinthefieldinPian
8、xian,SichuanandTianshui,GansuforstriperustresistanceandinBaoding,HebeiandZhoukou,Henanforleafrustresistanceduringthe2012-2013croppingseason.Accordingtothemaximumdiseaseseverities(MDS)andtheareaunderthediseaseprogresscurve(AUDPC),