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时间:2020-06-04
《芝麻细菌性青枯病病原菌及其生化变种鉴定.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第39卷第1期植物保护学报V01.39No.12012钲2月ACTAPHYT0PHYLACICASINICAFeb.2012芝麻细菌性青枯病病原菌及其生化变种鉴定华菊玲胡白石李湘民黄瑞荣刘光荣。(1.江西省农业科学院植物保护研究所,南昌330200;2.南京农业大学植物保护学院,农业部病虫监测与治理重点开放实验室,南京210095;3.江西省农业科学院土壤肥料与资源环境研究所,南昌330200)摘要:芝麻细菌性青枯病是我国南方芝麻生产上的重要病害。调查研究表明,芝麻青枯病除前人报道的萎蔫、顶梢常有溃疡裂
2、缝等典型症状外,还有植株畸形、茎秆表皮泡状突起、溃疡裂缝延伸至茎秆中下部、折断茎秆可见菌脓形成的透明细丝等症状。分离获得的病原菌菌株经茵体形态、菌落形态、培养性状、致病性、烟草过敏性反应及16SrRNA基因和16S~23SrRNA基因间区ITS序列测定,证实了芝麻青枯病是由青枯菌Ralstoniasolanacearum引起。江西省15个县(市)的22个代表性菌株的生化变种鉴定显示,20株菌属于生化变种Ⅲ,占90.91%,2株属于生化变种Ⅳ,占9.09%。说明生化变种Ⅲ菌群是诱发芝麻青枯病流行的优势种群
3、。关键词:芝麻青枯病;病原鉴定;16SrRNA;ITS;生化变种IdentificationofthepathogencausingbacterialwiltofsesameanditsbiovarsHuaJulingHuBaishiLiXiangmingHuangRuirongLiuGuangrong。(1.PlantProtectionInstitute,JiangxiAcademyofAgculturalSciences,Nanchang330200,JiangxiProvince,China;2
4、.DepartmentofPlantProtection,NanjingAgriculturalUniversity,Nanjing210095,JiangsuProvince,China;3.SoilandFertilizer&ResourcesandEnvironmentInstitute,JiangxiAcademyofAgriculturalSciences,Nanchang330200,JiangxiProvince,China)Abstract:Bacterialwiltisoneofthe
5、mostseriousdiseasesofsesameinsouthChina.Thisdiseaseusual—lyseverelyreducestheyieldofsesame。Besidesusualtypicalsymptomsofoverwih,gaponthetoppartofstem,therehadsymptomsofsesamewilt,includingdeformation,alveolarbulgewithbacterialoozeonstem,gaponthelowerpart
6、ofstem,filiformbacterialoozeinbrokenstemappearedinthe2-yearfieldstudies.ThestrainsisolatedfromthesampleofsesamebacterialwiltwereidentifiedasRalstonias0一lanacearumbasedontheirmorphology,culturalcharacteristics,pathogenicitytestandtobaccoanaphylax—is.These
7、quenceanalysesof16SrRNAgeneand16S一23SrRNAgeneITSdemonstrated99%一100%similaritytoR.solanacearum.Biovartestof22isolateswhichcollectedfrom15countiesinJiangxiProvinceshowedthat20strainsbelongtobiovarⅢ,and2stransbelongtobiovar1V,accountedf0r90.91%and9.09%ofth
8、e22isolates.respectively.ItmeansthatbiovarⅢisadominantpathogeninducedsesa-mebacterialwiltepidemics.Keywords:sesamebacterialwilt;pathogenidentification;16SrRNA;ITS;biovar芝麻细菌性青枯病多发生于我国南方各芝麻产红壤旱地、低洼潮湿地夏芝麻发病最甚。据作者等区⋯,该病害是江西芝麻
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