Abstract
Soda lakes are characterized by an intense sulfur cycle that begins with sulfidogenesis. Model laboratory experiments that involved combining of pure cultures showed that, during anaerobic decomposition of cellulose by Clostridium alkalicellulosi, the sulfate-reducing bacteria (SRB) of the species Desulfonatronovibrio hydrogenovorans, Desulfonatronum lacustre, and Desulfonatronum cooperativum, different in their nutritional requirements, may directly use the cellulose fermentation products for sulfidogenesis without mediatory microorganisms. In binary cocultures with SRB, the amount of the H2S formed constituted from one-third to two-thirds of the cellulose [H] equivalents; acetate was among the products formed. When the syntrophic Contubernalis alkalaceticum, capable of acetate oxidation, was incorporated into the trophic chain along with hydrogenotrophic SRB, the amount of the H2S formed exceeded by 33–42% the amount of the [H] equivalents in the utilized cellulose, water being the source of additional hydrogen. Thus, the trophic pathway from plant residues to sulfide, previously considered to be the longest in the alkaliphilic microbial community, may involve a minimal number of stages and do without intermediate participation of dissipotrophic fermenting organisms.
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Original Russian Text © G.A. Zavarzin, T.N. Zhilina, L.E. Dulov, 2008, published in Mikrobiologiya, 2008, Vol. 77, No. 4, pp. 472–482.
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Zavarzin, G.A., Zhilina, T.N. & Dulov, L.E. Alkaliphilic sulfidogenesis on cellulose by combined cultures. Microbiology 77, 419–429 (2008). https://doi.org/10.1134/S0026261708040061
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DOI: https://doi.org/10.1134/S0026261708040061