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- Title
Geoalkalibacter ferrihydriticus gen. nov. sp. nov., the first alkaliphilic representative of the family Geobacteraceae, isolated from a soda lake.
- Authors
Zavarzina, D. G.; Kolganova, T. V.; Boulygina, E. S.; Kostrikina, N. A.; Tourova, T. P.; Zavarzin, G. A.
- Abstract
Investigation of iron reduction in bottom sediments of alkaline soda lakes resulted in the isolation of a new obligately anaerobic iron-reducing bacterium, strain Z-0531, from Lake Khadyn (Tuva, Russia) sediment samples. The cells of strain Z-0531 are short (1.0–1.5 by 0.3–0.5 µm), motile, non-spore-forming, gram-negative rods. The isolate is an obligate alkaliphile, developing in the pH range of 7.8–10.0, with an optimum at pH 8.6. It does not require NaCl but grows at NaCl concentrations of 0–50 g/l. It can oxidize acetate with such electron acceptors as amorphous Fe(III) hydroxide (AFH), EDTA-Fe(III), anthraquinone-2,6-disulfonate (quinone), Mn(IV), and S0. On medium with EDTA-Fe(III), the isolate can oxidize, apart from acetate, ethanol, pyruvate, oxalate, arginine, tartrate, lactate, propionate, and serine. H2 is not utilized. The reduced products formed during growth with AFH are siderite or magnetite, depending on the growth conditions. The isolate is incapable of fermenting sugars, peptides, and amino acids. Yeast extract or vitamins are required as growth factors. The organism is capable of dinitrogen fixation and harbors the nifH gene. The DNA G+C content is 55.3 mol %. 16S rRNA analysis places strain Z-0531 into the family Geobacteraceae. Its closest relative (93% similarity) is Desulfuromonas palmitatis. Based on phenotypic distinctions and phylogenetic position, it is proposed that this strain be assigned to the new genus and species Geoalkalibacter ferrihydriticus gen. nov., sp. nov. (Z-0531T-DSMZ-17813-VKMB-2401).
- Subjects
TUVA (Russia); BACTERIA classification; IRON bacteria; SPECIES; LAKE sediments; ANAEROBIC bacteria; NITROGEN fixation
- Publication
Microbiology (00262617), 2006, Vol 75, Issue 6, p673
- ISSN
0026-2617
- Publication type
Article
- DOI
10.1134/S0026261706060099