title: Pleomorphomonas oryzae gen. nov., sp. nov., a nitrogen-fixing bacterium isolated from paddy soil of Oryza sativa.
abstract: Five strains of free-living diazotrophs isolated from rice were characterized by using a polyphasic approach. The strains were found to be very closely related, with 99-100 % 16S rRNA gene sequence similarity and DNA-DNA hybridization values greater than 70 %, suggesting that they represent a single species. When compared with other recognized species, they showed not more than 93 and 89 % similarity for the 16S rRNA and nifH gene sequences, respectively. Phylogenetic distances showed that these isolates were distinct from other taxa within the alpha-Proteobacteria. Chemotaxonomic characteristics of these isolates included the DNA G + C content (62.1-63.1 mol%), the major quinone system (Q-10), predominant fatty acids (18 : 1omega7c, cyclo 19 : 0omega8c and 16 : 0) and major hydroxy fatty acids (14 : 0 3-OH, 18 : 0 3-OH and 16 : 0 3-OH). Based on phylogenetic and phenotypic analyses, these isolates are considered to represent a novel genus and species, for which the name Pleomorphomonas oryzae gen. nov., sp. nov. is proposed. The type strain is F-7(T) (=IAM 15079(T) = ATCC BAA-940(T) = DSM 16300(T)).
authors.affiliation: Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-Ku, Tokyo 113-0032, Japan.
authors.forename: Cheng-Hui
authors.initials: CH
authors.lastname: Xie
authors.affiliation: Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1, Yayoi, Bunkyo-Ku, Tokyo 113-0032, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Yokota
mesh_terms: D020561:Alphaproteobacteria / Q000145:classification* / Q000166:cytology / Q000302:isolation & purification* / Q000502:physiology; D001426:Bacterial Proteins / Q000235:genetics; D001482:Base Composition; D004269:DNA, Bacterial / Q000737:chemistry / Q000302:isolation & purification; D004275:DNA, Ribosomal / Q000737:chemistry / Q000302:isolation & purification; D005227:Fatty Acids / Q000032:analysis / Q000302:isolation & purification; D005798:Genes, Bacterial; D020459:Genes, rRNA; D007564:Japan; D008969:Molecular Sequence Data; D009586:Nitrogen Fixation; D009693:Nucleic Acid Hybridization; D012275:Oryza / Q000382:microbiology*; D010088:Oxidoreductases / Q000235:genetics; D010802:Phylogeny; D011809:Quinones / Q000032:analysis / Q000302:isolation & purification; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D011809:Quinones; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D010088:Oxidoreductases; C029130:nitrogenase reductase