title: Diversity and geographical distribution of rhizobia associated with Lespedeza spp. in temperate and subtropical regions of China.
abstract: Eighty-eight root-nodule isolates from Lespedeza spp. grown in temperate and subtropical regions of China were characterized by a polyphasic approach. Nine clusters were defined in numerical taxonomy and SDS-PAGE analysis of whole cell proteins. Based upon further characterizations of amplified 16S rDNA restriction analysis (ARDRA), PCR-based restriction fragment length polymorphism of ribosomal IGS, 16S rDNA sequence analysis and DNA-DNA hybridization, these isolates were identified as Bradyrhizobium japonicum, B. elkanii, B. yuanmingense, Mesorhizobium amorphae, M. huakuii, Sinorhizobium meliloti and three genomic species related to B. yuanmingense, Rhizobium gallicum and R. tropici. The Bradyrhizobium species and R. tropici-related rhizobia were mainly isolated from the subtropical region and the species of Mesorhizobium, S. meliloti and R. gallicum-related species were all isolated from the temperate region. Phylogenetic analyses of nifH and nodC indicated that the symbiotic genes of distinct rhizobial species associated with Lespedeza spp. might have different origins and there was no evidence for lateral gene transfer of symbiotic genes. The results obtained in the present study and in a previous report demonstrated that Lespedeza spp. are nodulated by rhizobia with diverse genomic backgrounds and these Lespedeza-nodulating rhizobia were not specific to the host species, but specific to their geographic origins.
authors.affiliation: Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture/Department of Microbiology, College of Biological Sciences, China Agricultural University, Beijing 100094, China.
authors.forename: Chun Tao
authors.initials: CT
authors.lastname: Gu
authors.forename: En Tao
authors.initials: ET
authors.lastname: Wang
authors.forename: Xin Hua
authors.initials: XH
authors.lastname: Sui
authors.forename: Wen Feng
authors.initials: WF
authors.lastname: Chen
authors.forename: Wen Xin
authors.initials: WX
authors.lastname: Chen
mesh_terms: D020561:Alphaproteobacteria / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D001426:Bacterial Proteins / Q000032:analysis / Q000235:genetics; D002681:China; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D021903:DNA, Ribosomal Spacer / Q000737:chemistry / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D020459:Genes, rRNA; D005843:Geography; D029884:Lespedeza / Q000382:microbiology*; D008969:Molecular Sequence Data; D017351:N-Acetylglucosaminyltransferases / Q000235:genetics; D009693:Nucleic Acid Hybridization; D010088:Oxidoreductases / Q000235:genetics; D010802:Phylogeny; D018517:Plant Roots / Q000382:microbiology; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D020543:Proteome / Q000032:analysis; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D021903:DNA, Ribosomal Spacer; D020543:Proteome; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D010088:Oxidoreductases; C029130:nitrogenase reductase; D017351:N-Acetylglucosaminyltransferases; C060771:NodC protein, Rhizobiales