费氏中华根瘤菌(Sinorhizobium fredii)质粒复制基因repC序列多样性的研究  

Diversity of repC Plasmid-replication Sequences in Sinorhizobium fredii

作　　者：周岿[1] 夏薇[1] 丁晨红[1] 周俊初[1] 

机构地区：[1]华中农业大学农业微生物学国家重奌实验室,武汉430070

出　　处：《华中农业大学学报》2005年第6期537-543,共7页Journal of Huazhong Agricultural University

基　　金：国家973重点基础研究计划(001CB108901);国家自然科学基金项目(30270052和304700656)资助

摘　　要：采用质粒快速检测法从供试33株费氏中华根瘤菌中分别检测出2～4个内源大质粒.用根据豌豆根瘤菌的repC基因设计1对引物RC1和RC3,从供试菌株及3株华癸中生根瘤菌和1株大豆慢生根瘤菌中扩增得到repC基因片段,证明在费氏中华根瘤菌中广泛存在repC基因.通过对扩增产物的测序,并与已报道的repC基因序列进行聚类分析,发现供试菌株可分为2个群,群a和群b,群内十分保守,但群间差异明显;其中群b的序列与已知类型的差异明显.Two to four plasmids were detected from thirty three strains of Sinorhizobiurn fredii by using modified Eckhardt method. A pair of primers RC1/RC3 were designed according to conservative sequences of repC gene and used for the amplification of repC genes from the above 33 strains, 3 strains of Mesorhizobium huakuii and I strain of Bradyrhizobium japonicum. The results suggested that the repC gene also existed in most strains of Sinorhizobium fredii. Amplified DNA fragments were cloned to pMD18-T and sequenced. The sequences were used to be compare with the reported repC genes. Results from clustering analysis indicated that the strains tested could be divided into group a and group b. The sequences in the same group were very conservative but shown great differences between group a and group b. The repC gene of group b was significantly different from repC genes reported.

关 键 词：费氏中华根瘤菌 内源质粒 repC 聚类分析 

分 类 号：S154.381[农业科学—土壤学]