Archives of Microbiology

, Volume 169, Issue 3, pp 239–248

Reduction of diverse electron acceptors by Aeromonas hydrophila

  • V. Knight
  • R. Blakemore
Original paper

DOI: 10.1007/s002030050567

Cite this article as:
Knight, V. & Blakemore, R. Arch Microbiol (1998) 169: 239. doi:10.1007/s002030050567

Abstract

Aeromonas hydrophila ATCC 7966 grew anaerobically on glycerol with nitrate, fumarate, Fe(III), Co(III), or Se(VI) as the sole terminal electron acceptor, but did not ferment glycerol. Final cell yields were directly proportional to the amount of terminal electron acceptor provided. Twenty-four estuarine mesophilic aeromonads were isolated; all reduced nitrate, Fe(III), or Co(III), and five strains reduced Se(VI). Dissimilatory Fe(III) reduction by A. hydrophila may involve cytochromes. Difference spectra obtained with whole cells showed absorption maxima at wavelengths characteristic of c-type cytochromes (419, 522, and 553 nm). Hydrogen-reduced cytochromes within intact cells were oxidized by the addition of Fe(III) or nitrate. Studies with respiratory inhibitors yielded results consistent with a respiratory chain involving succinate (flavin-containing) dehydrogenase, quinones and cytochromes, and a single Fe(III) reductase. Neither anaerobic respiration nor dissimilatory metal reduction by members of the genus Aeromonas have been reported previously.

Key words Nitrate reduction Fe(III) reduction Co(III) reduction Se(VI) reduction Mesophilic aeromonads Cytochromes Estuarine bacteria 

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • V. Knight
    • 1
  • R. Blakemore
    • 1
  1. 1.Department of Microbiology, Rudman Hall, University of New Hampshire, Durham, NH 03824, USA Tel. +1-603-862-2211; Fax +1-603-862-2621 e-mail: rpb@christa.unh.eduUS

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