title: Characterization of rhizobia isolated from Albizia spp. in comparison with microsymbionts of Acacia spp. and Leucaena leucocephala grown in China.
abstract: This is the first systematic study of rhizobia associated with Albizia trees. The analyses of PCR-RFLP and sequencing of 16S rRNA genes, SDS-PAGE of whole-cell proteins and clustering of phenotypic characters grouped the 31 rhizobial strains isolated from Albizia into eight putative species within the genera Bradyrhizobium, Mesorhizobium and Rhizobium. Among these eight rhizobial species, five were unique to Albizia and the remaining three were shared with Acacia and Leucaena, two legume trees coexisting with Albizia in China. These results indicated that Albizia species nodulate with a wide range of rhizobial species and had preference of microsymbionts different from Acacia and Leucaena. The definition of four novel groups, Mesorhizobium sp., Rhizobium sp. I, Rhizobium sp. II and "R. giardinii", indicates that further studies with enlarged rhizobial population are necessary to better understand the diversity and to clarify the taxonomic relationships of Albizia-associated rhizobia.
authors.affiliation: Key Laboratory of Agro-Microbial Resource and Application, Ministry of Agriculture/College of Biological Sciences, China Agricultural University, Beijing 100094, China.
authors.forename: Feng Qin
authors.initials: FQ
authors.lastname: Wang
authors.forename: En Tao
authors.initials: ET
authors.lastname: Wang
authors.forename: Yong Fa
authors.initials: YF
authors.lastname: Zhang
authors.forename: Wen Xin
authors.initials: WX
authors.lastname: Chen
mesh_terms: D000045:Acacia / Q000382:microbiology; D031289:Albizzia / Q000382:microbiology*; D001426:Bacterial Proteins / Q000032:analysis / Q000302:isolation & purification; D044822:Biodiversity; D002681:China; D016000:Cluster Analysis; D016172:DNA Fingerprinting; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D020459:Genes, rRNA; D008969:Molecular Sequence Data; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length; D020543:Proteome / Q000032:analysis / Q000302:isolation & purification; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012230:Rhizobiaceae / Q000737:chemistry / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D020543:Proteome; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S