欢迎来到天天文库
浏览记录
ID:55607233
大小:611.50 KB
页数:5页
时间:2020-05-20
《陈化烟叶中纤维素降解菌群的分离及其特性研究-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、2013.12,34(6)中国烟草科学ChineseTobaccoSciencel03陈化烟叶中纤维素降解茵群的分离及其特性研究关亮,一,李天丽,陈竹亭,周亚维,汤朝起2,瞿永生,李朋富,(1.南京大学生命科学院,南京210093;2.上海烟草集团有限责任公司,上海200082)摘要:从陈化烟叶中分离到具有降解纤维素活性的菌群,分析了温度、pH和纤维素材料对菌群酶活性的影响,采用16SrDNA片段的PCR.DGGE(变形梯度凝胶电泳)技术分析菌群组成。结果显示,菌群主要由5种细菌组成。20℃时菌群纤维素酶活性很低,
2、随着温度升高酶活性升高,在60℃时纤维素酶活性达到最高值,继续升温则酶活性下降。pH从3升高到8时,菌群纤维素酶活性不断增大,pH为8时酶活性达到最大,pH继续升高到9时则酶活性下降。菌群对烟叶、滤纸和烟梗中的纤维素都有降解作用,在以烟叶作为纤维素材料培养菌群时,纤维素酶活性明显高于滤纸和烟梗。陈化过程中微生物可能对烟叶纤维素有降解作用,从而影响烟叶的陈化效果;可以利用分离到的菌群在烟叶或烟梗发酵中降解纤维素,改善烟叶或烟梗的品质。关键词:陈化烟叶;纤维素降解;菌群;纤维素酶活性中图分类号:$572.01文章编号:
3、1007.5119(2013)06.0103.05DOI:10.3969~.issn.1007.5119.2013.06.020IsolationandCharaCterizatiOnofBacterialCommunitywithCellulose-DecompositionAbilityfrOrnAgingFlue—curedTobaccoLeavesGUANLiang,LITianli,CHENZhuting,ZHOUYawei,TANGChaoqi,QUYongsheng,LIPengfu,(1.Schoo
4、lofLifeScience,NanjingUniversity,Nanjing210093,China;2.ShanghaiTobaccoGroupCo.,Ltd.,Shanghai200082,China)Abstract:Largeamountsofbacteriahavebeenfoundonagingflue.curedtobaccoleaves.Abacterialcommunitywiththeabilitytodecomposeeellulosewasisolatedfromagingflue.cu
5、redtobaccoleaves.Theefectsoftemperature.pHvalueanddiferentcellulosesourceonthecellulaseactivityofbacterialcommunitywerefurtherinvestigated.16SrDNAPCR—DGGEtechnologywasusedtoanalyzebacterialcommunitycomposition.Theresultsshowedthatthebacterialcommunitymainlycon
6、sistedoffivespecies.At20℃.thecellulaseactivityofthebacterialcommunitywasverylow.Withthetemperatureincreasing.thecellulaseactivityincreased.andreachedthepeakat60℃.Whenthetemperatureexceeded60℃.thecellulaseactivitythendecreaseddramatically.WiththepHvalueincreasi
7、ngfrom3to8thecellulaseactivityincreasedgradually.andreachedthepeakatpH8.珊1enthepHvalueincreasedfrom8to9.thecelluloseactivitydroppedsharply.Thebacterialcommunitywasabletodecomposemeeelluloseinthetobacco1eaves,filterPaperandthetobaccostalk.Theeellulaseactivityof
8、thebacterialcomunityfermentedinthetobaccoleaveswassignificantlyhigherthanthatinthefilterPaDerandtobaccostalk.Inconclusion,thebacteriamayhaveinfluenceonthecellulosedecompositionofto
此文档下载收益归作者所有