Microbially Mediated Coupling of Fe and N Cycles by Nitrate-Reducing Fe(II)-Oxidizing Bacteria in Littoral Freshwater Sediments

Applied and Environmental Microbiology
Franziska SchaedlerCaroline Schmidt

Abstract

Nitrate-reducing iron(II)-oxidizing bacteria have been known for approximately 20 years. There has been much debate as to what extent the reduction of nitrate and the oxidation of ferrous iron are coupled via enzymatic pathways or via abiotic processes induced by nitrite formed by heterotrophic denitrification. The aim of the present study was to assess the coupling of nitrate reduction and iron(II) oxidation by monitoring changes in substrate concentrations, as well as in the activity of nitrate-reducing bacteria in natural littoral freshwater sediment, in response to stimulation with nitrate and iron(II). In substrate-amended microcosms, we found that the biotic oxidation of ferrous iron depended on the simultaneous microbial reduction of nitrate. Additionally, the abiotic oxidation of ferrous iron by nitrite in sterilized sediment was not fast enough to explain the iron oxidation rates observed in microbially active sediment. Furthermore, the expression levels of genes coding for enzymes crucial for nitrate reduction were in some setups stimulated by the presence of ferrous iron. These results indicate that there is a direct influence of ferrous iron on bacterial denitrification and support the hypothesis that microbial nitr...Continue Reading

References

Jun 1, 1991·Microbiological Reviews·D R Lovley
Dec 1, 1994·Applied and Environmental Microbiology·A Ehrenreich, F Widdel
Dec 24, 1997·Applied and Environmental Microbiology·D Emerson, C Moyer
Oct 19, 2004·Journal of Microbiological Methods·Sonia HenryLaurent Philippot
Apr 1, 1986·Applied and Environmental Microbiology·D R Lovley, E J Phillips
Jan 5, 2006·Applied and Environmental Microbiology·Karrie A WeberJohn D Coates
Apr 1, 1996·Applied and Environmental Microbiology·K L StraubF Widdel
May 10, 2006·Systematic and Applied Microbiology·Rajkumari KumaraswamyGerard Muyzer
Sep 8, 2006·Applied and Environmental Microbiology·Ellen KandelerLaurent Philippot
Dec 3, 2008·Applied and Environmental Microbiology·Marco Blöthe, Eric E Roden
Dec 17, 2009·Environmental Science & Technology·Thomas BorchKate Campbell
Jul 12, 2011·Applied and Environmental Microbiology·Aaron J CobyEric E Roden
Oct 18, 2011·Applied and Environmental Microbiology·Anirban ChakrabortyFlynn Picardal
Nov 13, 2012·Applied and Environmental Microbiology·Anirban Chakraborty, Flynn Picardal
Nov 28, 2012·Biochemical Society Transactions·Eric E Roden
Oct 21, 2014·Nature Reviews. Microbiology·Emily D MeltonAndreas Kappler
Aug 9, 2016·Applied and Environmental Microbiology·Katja LauferAndreas Kappler
Oct 22, 2016·Environmental Microbiology·Jasmine S BergMarcel M M Kuypers
Feb 9, 2017·Environmental Microbiology·Andreas Kappler, Casey Bryce

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