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International Journal of Systematic and Evolutionary Microbiology, Vol 51, 489-493, Copyright © 2001 by Society for General Microbiology
N Cuzin, AS Ouattara, M Labat and JL Garcia
Laboratoire de Microbiologie IRD, IFR-BAIM, Universites de Provence et de la Mediterranee, ESIL Case 925, 163 Avenue de Luminy, 13288 Marseille cedex 9, France
Strain C(T), a non-motile, mesophilic, hydrogenotrophic, methanogenic bacterium, was isolated from an anaerobic digester used for the treatment of raw cassava-peel waste in Congo. The cells were rods, 0.4--0.5 x 2--10 microm in size, and stained Gram-positive. Hydrogen and carbon dioxide were the only substrates that supported growth and methane production. Methane production, but not growth, occurred with CO(2) in the presence of either 2-propanol, 2-butanol or cyclopentanol as hydrogen donors. The temperature range for growth was 25--50 degrees C, the optimum being between 37 and 42 degrees C. The optimum pH for growth was 7.2; consistent growth and methane production were not observed below pH 5.9 or above pH 8.2. The doubling time under optimal growth conditions was 7.5 h. The DNA base composition was 39.5 mol% G+C. On the basis of 16S rRNA gene sequence analysis and phenotypic characteristics, the isolate is proposed as a new species of the genus Methanobacterium, namely Methanobacterium congolense sp. nov. The type strain is strain C(T) (=DSM 7095(T)=OCM 779(T)).
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