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Microaerophilic, Fe(II)-dependent growth and Fe(II) oxidation by a Dechlorospirillum species.
Citation key Picardal2011
Author Flynn W Picardal and Zehra Zaybak and Anirban Chakraborty and Jürgen Schieber and Ulrich Szewzyk
Pages 51–57
Year 2011
DOI 10.1111/j.1574-6968.2011.02265.x
Journal FEMS Microbiology Letters
Volume 319
Number 1
Month Jun
Institution School of Public and Environmental Affairs, Indiana University, Bloomington, IN, USA. picardal@indiana.edu
Abstract A species of Dechlorospirillum was isolated from an Fe(II)-oxidizing, opposing-gradient-culture enrichment using an inoculum from a circumneutral, freshwater creek that showed copious amounts of Fe(III) (hydr)oxide precipitation. In gradient cultures amended with a redox indicator to visualize the depth of oxygen penetration, Dechlorospirillum sp. strain M1 showed Fe(II)-dependent growth at the oxic-anoxic interface and was unable to utilize sulfide as an alternate electron donor. The bacterium also grew with acetate as an electron donor under both microaerophilic and nitrate-reducing conditions, but was incapable of organotrophic Fe(III) reduction or nitrate-dependent Fe(II) oxidation. Although members of the genus Dechlorospirillum are primarily known as perchlorate and nitrate reducers, our results suggest that some species are members of the microbial communities involved in iron redox cycling at the oxic-anoxic transition zones in freshwater sediments.
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Head of Chair

Prof. Dr. rer. nat. Ulrich Szewzyk
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Bärbel Minx
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Environmental Microbiology
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