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1、乳酸杆菌的分离与分子鉴定刘芸1,刘波'*,朱育菁1,马丽娜1,刘丹莹1,张衡宇2,刘贯锋2(1.福建省农业科学院农业牛•物资源所,福建福州350003;2.福建农林大学,福建福州350002)摘要:从市售酸奶样品中分离,筛选出2株乳酸杆菌CF7和CF9,它们能较好地利用豆类基质发酵形成乳酸饮料。本文利用形态学观察、生理生化方法对菌株进行了初步的分类和鉴定。株CF7,CF9均为杆状,无芽抱,革兰氏阳性,过氧化氢酶阴性。菌株CF7的生理生化特征与植物乳杆菌(Lactobacillusplantarum)—致,菌株CF9的生理生化特征与干酪乳杆^(La
2、ctobacilluscasei)基本一致。并进一步通过菌株的16SrDNA基因扩增、克隆测序分析。测序结果在GcnBank中进行同源性比较,并下载部分具有代表性或种的16SrDNA序列,利用软件DNAMAN进行分子系统发育树分析,其鉴定结果与生理生化鉴定结果一致,表明菌株CF7为植物乳杆菌,菌株CF9为干酪乳杆菌。关键词:乳酸杆菌;16SrDNA;分子鉴定;植物乳杆菌;干酪乳杆菌文献标识码:A中图分类号:S879.1IsolationandidentificationofLacticacidbacteriastrainsLIUYun1,LIUB
3、o1,ZHUYu-jing1,XIAORong-fcng1,MALi-na1,ZHANGHeng-Yu2,LIUGuang-fcng2(].AgriculturalBio・ResourcesResearchInstitute.FujianAcademyofAgriculturalSciences,Fuzhou350003,China;2.FujianAgriculturalandForestryUniversity,Fuzhou350002,China)Abstract:TwolacticacidbacteriastrainsCF7andCF9w
4、ereisolatedfromajogurtsample.Theycanbeusedtopreparebeanlactobacillusbeverage.Inpresentresearch,theywereobservedunderscanningandtransmissionelectronicmicroscopeandidentifiedaccordingtotheirphysiologicalandbio-chcmicalproperties・Their16SrDNAweresubjectedtoamplificationbyPCR,don
5、ningandsequencing.Theresults收稿日期:基金项目:水通讯作者Authorforcorrespondence(E-mail:liubofhas@163.com)revealedthatbothofCF7andCF9wererod-shaded,Gram-negativeandcatalase-negativewithoutspore・ThebiochemicalcharacteristicsofCF7andCF9weresimilartothoseofLactobacillusplantaruniandLactobacil
6、luscasei,respectively.Theelonned16SrDNAwere1528bpforCF7(GcnBankaccess#:HQ318714)and1531bpforCF9(GenBankaccess#:HQ318715).ThetestedDNAsequenceswerecomparedwiththoseinGenBank.Thephylogenetictreeof16SrRNA,whichwascarriedoutwithsoftwareofDNAMAN?indicatedthatCF7andCF9wereLactobaci
7、llusplantarumandLactobacilluscaseinrespectively.Morphologicalcharateristics,physiologicalandbio-chemicalpropertiessupportedtheresultsfromtheanalysisof16SrDNAsequencesofCF7andCF9.Keywords:lacticacidbacteria,16SrDNA,identification,Lactobacillusplantarum,Lactobacilluseasel乳酸菌(LA
8、B,Lacticacidbacteria)是一类能发酵碳水化合物,产生人最乳酸的细菌的总称,在食品发酵、工业生产和维护人畜健康中起着重要