title: Ideonella azotifigens sp. nov., an aerobic diazotroph of the Betaproteobacteria isolated from grass rhizosphere soil, and emended description of the genus Ideonella.
abstract: Strain 1a22T, a nitrogen-fixing bacterium, was isolated from soil associated with the rhizosphere of a perennial grass growing in a fallow agricultural field in Ithaca, New York, USA. Analysis of the 16S rRNA gene sequence placed the strain in the Rubrivivax-Roseateles-Leptothrix-Azohydromonas-Aquincola-Ideonella branch of the Betaproteobacteria and the closest characterized relative was the type strain of Ideonella dechloratans (97.7% 16S rRNA sequence similarity). Cells of strain 1a22T were Gram-negative, motile, straight rods, which formed polyhydroxybutyrate-like granules and were positive for oxidase and weakly positive for catalase. Cells were chemo-organotrophic, unable to grow by reduction of chlorate or nitrate and grew exclusively through aerobic respiration. Growth with mannitol on N-free solid media caused the strain to produce copious amounts of slime. The G+C content of the genomic DNA was 67.4 mol%. The major cellular fatty acids were C16:1 cis-9 and C16:0 and cells contained significant amounts of the hydroxy fatty acids C10:0 3-OH, C12:0 2-OH and C12:0 3-OH. Based on DNA-DNA hybridization studies, 16S rRNA gene sequence analysis, fatty acid analysis, and morphological and physiological characteristics, strain 1a22T represents a novel species in the genus Ideonella, for which the name Ideonella azotifigens sp. nov. is proposed. The type strain of Ideonella azotifigens is 1a22T (=JCM 15503T=DSM 21438T).
authors: Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853, USA.
authors: Jesse D
authors: JD
authors: Noar
authors: Daniel H
authors: DH
authors: Buckley
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D020562:Betaproteobacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification* / Q000502:physiology; D002374:Catalase / Q000378:metabolism; D016000:Cluster Analysis; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D005227:Fatty Acids / Q000032:analysis; D006885:Hydroxybutyrates / Q000378:metabolism; D008124:Locomotion; D008969:Molecular Sequence Data; D009518:New York; D009586:Nitrogen Fixation; D009693:Nucleic Acid Hybridization; D010088:Oxidoreductases / Q000378:metabolism; D010802:Phylogeny; D018517:Plant Roots / Q000382:microbiology*; D006109:Poaceae / Q000382:microbiology*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D012988:Soil Microbiology
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005227:Fatty Acids; D006885:Hydroxybutyrates; D012336:RNA, Ribosomal, 16S; D010088:Oxidoreductases; D002374:Catalase