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1 Faculty of Agriculture, Yamagata University, Wakaba-machi 1-23, Tsuruoka 997-8555, Japan
2 Institute for Biological Resources and Functions, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 6, Higashi 1-1-1, Tsukuba 305-8566, Japan
Correspondence
Atsuko Ueki
uatsuko{at}tds1.tr.yamagata-u.ac.jp
Two propionate-producing strains (WdT and Wf) that were isolated anaerobically from plant residue of irrigated rice-field soil in Japan were characterized phenotypically and phylogenetically. The growth rate of strain WdT was very slow in basal medium, but both growth and propionate production were stimulated significantly by the addition of cyanocobalamin. Strain Wf grew well in basal medium and produced substantial amounts of fermentation products, including propionate. Other phenotypic and phylogenetic characteristics of the two isolates were almost identical. Both were facultatively anaerobic, but much better growth was observed under anaerobic conditions. Cells were Gram-positive, non-motile, non-spore-forming and pleomorphic rods with irregular V- or crescent-shaped cell arrangements. Fermentation products from glucose in the presence of excess cyanocobalamin were acetate, lactate, a small amount of succinate and CO2, in addition to propionate. Both oxidase and catalase activities were negative. The strains possessed meso-diaminopimelic acid in their peptidoglycan and their major cellular fatty acids were C13 : 0, anteiso-C15 : 0 and C15 : 0. The isolates had high genomic DNA G+C contents (68·7 and 67·4 mol%, respectively). Menaquinones MK-9(H4) and MK-10(H4) were the predominant respiratory quinones. Phylogenetic analysis based on 16S rDNA sequences placed both strains in the Actinobacteria, with Micropruina glycogenica as their closest relative (sequence similarity values of 95·8 and 95·7 %, respectively). Microlunatus phosphovorus and Friedmanniella antarctica were also related closely to the isolates. As their morphological, physiological and chemotaxonomic characteristics were distinctly different from those of any related species, Propionicimonas paludicola gen. nov., sp. nov. is proposed to accommodate these strains. The type strain of the novel species is WdT (=JCM 11933T=DSM 15597T).
Published online ahead of print on 13 June 2003 as DOI 10.1099/ijs.0.02764-0.
The GenBank/EMBL/DDBJ accession numbers for the 16S rDNA sequences of strains WdT and Wf are AB078858 and AB078859, respectively.
Micrographs of strains WdT and Wf are available as supplementary material in IJSEM Online.
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