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1、Mycosystema菌物学报15September2011,30(5):702-712jwxt@im.ac.cnISSN1672-6472CN11-5180Q©2011InstituteofMicrobiology,CAS,allrightsreserved.Morphologicalandmolecularcharacterizationsofpowderymildew,PodosphaeraxanthiioccurringoncucurbitsinChangchunAgri-ExpoGarden,China1,2*1113LIUShu-YanWANGLi-LanJIANGWen-Tao
2、LIYuLIUYan-Yan1EngineeringResearchCenterofChineseMinistryofEducationforEdibleandMedicinalFungi,JilinAgriculturalUniversity,Changchun130118,China2DepartmentofPlantPathology,CollegeofAgronomy,JilinAgriculturalUniversity,Changchun130118,China3JilinProvincialExperimentalSchool,Changchun130022,ChinaAbst
3、ract:Inautumnof2009,powderymildewbrokeoutoncucurbitsinChangchunAgri-Expon,JilinProvince,China.AlargenumberofchasmotheciaofthefunguswerefoundonplantsoffourgenerabelongingtoCucurbitaceae(Lagenaria,Cucumis,TrichosanthesandCucurbita).Asurveywasconductedtoevaluatetheresistanceoftheseplantstopowderymilde
4、wbasedondiseaseincidence,diseaseseverityanddiseaseindex.TheresultsindicatedthatalmostallvarietiescultivatedinCCAEGaresusceptibletothefungus.Morphologicalobservationshowsthattheconidiawereproducedinchainswithwelldevelopedfibrosinbodies,andchasmotheciacontainedasingleascuswith8ascosporesandawideapica
5、loculus(15.6－28.8μm).ThemorphologicalcharacteristicsofanamorphicandteleomorphicstagesrevealthatthisfungusbelongtoPodosphaeraxanthii.Themolecularanalysesofthenucleotidesequencesoftheinternaltranscribedspacer(ITS)rDNAregionsincludingthe5.8SrRNAgeneindicatethatthefunguswasclusteredinthecladeofP.xanthi
6、irecordedfromdifferenthostsandthesamehostfromdifferentregions.Theteleomorphsofpowderymildewoncucurbitsarerarelyfound.ItisthefirstreportofthesexualstagefoundonTrichosanthesintheworld,andonCucurbitapepoinJilinProvince,China.Moreover,WatermelonCitrulluslanatuswithoutchasmotheciawasanewhostrecordofthep
7、owderymildewinJilinProvince.Furtherresearchonthehostrange,epidemiology,resistantcucurbitsselectionandcontrolisrequired.Keywords:chasmothecia,morphology,molecularphylogeny,Podosphaeraxanthii,Erysiphales,Cucu
