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1、農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào)2012,31(3):563—569JournalofAgro-EnvironmentScience一株新的多菌靈高效降解菌的篩選與降解特性分析王呈玉1,2李明石17曲迪1,李成龍1,崔俊濤1,胡耀輝擴(kuò),王玉軍p(1.吉林農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院,長(zhǎng)春130118;2.吉林農(nóng)業(yè)大學(xué)食品科學(xué)與工程學(xué)院,長(zhǎng)春130118)摘要:從長(zhǎng)期施用多菌靈農(nóng)藥的土壤中,通過富集篩選,獲得1株新的多菌靈高效降解菌株。通過生理生化實(shí)驗(yàn)和16SrDNA序列同源性分析鑒定該菌株,應(yīng)用高效液相色譜法對(duì)純培養(yǎng)條件下菌株的降解特
2、性和粗酶提取液的降解性能進(jìn)行了分析。結(jié)果表明,篩選所獲得的菌株與Raoultella菌屬的親緣關(guān)系最近,將其命名為Raoultellasp.MBC,該菌株能在以多菌靈為唯一碳源的無機(jī)鹽培養(yǎng)基中生長(zhǎng);25oC、pH7.0、200r·min。的最適生長(zhǎng)條件下避光振蕩培養(yǎng)72h,多菌靈的降解率達(dá)到100%;在最適培養(yǎng)條件下外加氮源和碳源在培養(yǎng)后期均可以提高多菌靈的降解率,外加氮源對(duì)多菌靈的降解效果優(yōu)于外加碳源;該菌體的粗酶提取液具有降解多菌靈活性,且多菌靈降解酶為誘導(dǎo)酶。研究結(jié)果為多菌靈污染土壤的生物修復(fù)和酶修復(fù)提供了
3、材料和理論依據(jù)。關(guān)鍵詞:多菌靈;拉烏爾菌屬;分離鑒定;生物降解;降解特性中圖分類號(hào):X172文獻(xiàn)標(biāo)志碼:A文章編號(hào):1672—2043(2012)03—0563—07IdentificationandCharacterizationofaNewlyIsolatedCarbendazim-degradingBacterialStrainMBCWANGCheng-yul乞LIMing-shil,QUDil,LICheng-lon91,CUIJun-ta01,HUYao-hui’,WANGYu-jun”(1.CoHeg
4、eofResourcesandEnvironmentalSciences,JilinAgriculturalUniversity,Changchun130118,China;2.CoHegeofFoodScienceandEngineering,JilinAgriculturalUniversity,Changchun130118,China)Abstract:Anovelbacterialstrain,whichcaneffectivelyusecarbendazimassolecarbonandenergys
5、ource,wasisolatedfromlong-termcarbendazimadministeredsoilbyenrichmentscreening.Basedontheanalysisofphysiologicalandbiochemicalcharacteristics,16SrDNAgenesequeneehomologyandphylogenetictree,theisolatewasidentified.Itsdegradationcharacteristicsanddegradationcap
6、abilityofthelysateweretestedbyHPLC.ThenewbacterialstrainwasidentifiedasRaoultellasp.a(chǎn)ndnamedMBC.Resultsshowedthatthisstraincouldutilizecarbendazimassolecarbonsourceforgrowth,andcoulddegrade100%ofcarbendazimafter72hshakingcultureat200r·min一,25℃andpH7.0.Itsdegr
7、adationratewasincreasedbyaddingexogenouscarbonandnitrogensourceintothemediumatthelaterstageofculture,andthedegradationofaddingexogenousnitrogensourcewasmoreeffectivethanthatofcarbonsource.Thelysatehadadegradingactivityofcarbendazim,andthecatabolicenzymesweret
8、heinducedenzyme.Theseresultsprovidedarationaleandamaterialforbio-remediationoflong-termcarbendazim-contaminatedsoil.Keywords:carbendazim;Raoultellasp.;isolationandidentification;biodegrad