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Methylibium aquaticum sp. nov., a betaproteobacterium isolated from a eutrophic freshwater pond

Division of Biology and Ocean Sciences, Inha University, Incheon 402-751, Republic of Korea

Correspondence
Jang-Cheon Cho
chojc{at}inha.ac.kr

A freshwater bacterium, designated IMCC1728^T, was isolated from a eutrophic pond. The strain was Gram-negative, chemoheterotrophic and facultatively aerobic, forming non-motile rods that contained poly--hydroxybutyrate granules. Based on 16S rRNA gene sequence comparisons, the most closely related species to strain IMCC1728^T was Methylibium petroleiphilum (97.0 % similarity). Phylogenetic trees generated using 16S rRNA gene sequences showed that this isolate formed an independent phyletic line of the genus Methylibium clade of the class Betaproteobacteria. The DNA G+C content of the strain was 66.2±0.4 mol%. The predominant cellular fatty acid constituents were C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH (43.1 %), C_{16 : 0} (20.3 %), C_{12 : 0} (13.4 %) and C_{10 : 0} 3-OH (7.3 %). The strain contained Q-8 as the predominant ubiquinone. Several phenotypic characteristics, including flagellation, temperature range for growth and carbon source utilization patterns, differentiated strain IMCC1728^T from species of the genus Methylibium. Therefore, it is proposed that strain IMCC1728^T represents a novel species, Methylibium aquaticum sp. nov. The type strain is IMCC1728^T (=KCCM 42364^T=NBRC 102349^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain IMCC1728^T is DQ664244.

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