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Archives of Microbiology

, Volume 166, Issue 3, pp 160–168 | Cite as

Desulforhopalus vacuolatus gen. nov., sp. nov., a new moderately psychrophilic sulfate-reducing bacterium with gas vacuoles isolated from a temperate estuary

  • M. F. Isaksen
  • Andreas Teske
Original paper

Abstract

A new type of gas-vacuolated, sulfate-reducing bacterium was isolated at 10° C from reduced mud (E0 < 0) obtained from a temperate estuary with thiosulfate and lactate as substrates. The strain was moderately psychrophilic with optimum growth at 18–19° C and a maximum growth temperature of 24° C. Propionate, lactate, and alcohols served as electron donors and carbon sources. The organism grew heterotrophically only with hydrogen as electron donor. Propionate and lactate were incompletely oxidized to acetate; traces of lactate were fermented to propionate, CO2, and possibly acetate in the presence of sulfate. Pyruvate was utilized both with and without an electron acceptor present. The strain did not contain desulfoviridin. The G+C content was 48.4 mol%. The differences in the 16S rRNA sequence of the isolate compared with that of its closest phylogenetic neighbors, bacteria of the genus Desulfobulbus, support the assignment of the isolate to a new genus. The isolate is described as the type strain of the new species and genus, Desulforhopalus vacuolatus.

Key words Anaerobic sulfate reduction Incomplete propionate oxidation Marine environment Low temperature Psychrophilic bacteria Growth yields Desulforhopalus vacuolatus 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • M. F. Isaksen
    • 1
  • Andreas Teske
    • 2
  1. 1.Department of Microbial Ecology, Institute of Biological Science, University of Aarhus, DK-8000 Aarhus C, Denmark Tel. +45-8942-3241; Fax +45-8612-7191 e-mail: mai@bio.aau.dkDK
  2. 2.Max Planck Institute for Marine Microbiology, Fahrenheitstrasse 1, D-28359 Bremen, GermanyDE

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