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Volume 61, Issue 6

sp. nov., a hydrogenotrophic methanogen, isolated from rice-field soil Free

Abstract

A pure culture of an obligately anaerobic, hydrogenotrophic, methanogenic archaeon, designated strain 169, which grows with hydrogen and carbon dioxide as the sole energy and carbon sources, was isolated from an anaerobic propionate-oxidizing enrichment culture originally obtained as an inoculant from rice-field soil in Japan. Cells of strain 169 were non-motile, Gram-reaction-variable and rod-shaped or slightly curved rods with rounded ends (1.6–5.0×0.35–0.5 µm). Strain 169 had fimbriae at both ends of the cell (up to ~10 per cell) but did not possess flagella. Ultrathin sections showed a single-layered, electron-dense cell wall about 6 nm thick, which is typical of Gram-positive bacteria. Growth was observed at 15 °C–45 °C (optimum 40 °C), at pH  6.5–9.6 (optimum pH 7.5–8.5) and in 0–70 g NaCl l (0–1.2 M) (optimum 5 g NaCl l; 0.086 M). Strain 169 utilized only hydrogen and carbon dioxide as energy and carbon sources. The DNA G+C content was 39.3 mol%. The results of 16S rRNA gene sequence analysis indicated that strain 169 was most closely related to DSM 11074 (96.8 % sequence similarity) and DSM 1535 (96.4 %). On the basis of its morphological, physiological and phylogenetic characteristics, strain 169 ( = DSM 22026 = JCM 15797) represents a novel species of the genus , for which the name sp. nov. is proposed.

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2011-06-01
2024-04-25
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Methanobacterium kanagiense sp. nov., a hydrogenotrophic methanogen, isolated from rice-field soil
Int J Syst Evol Microbiol 61, 1246 (2011); https://doi.org/10.1099/ijs.0.026013-0
/content/journal/ijsem/10.1099/ijs.0.026013-0
/content/journal/ijsem/10.1099/ijs.0.026013-0
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