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Electric coupling between distant nitrate reduction and sulfide oxidation in marine sediment.
ISME J. 2014 Aug; 8(8):1682-90.IJ

Abstract

Filamentous bacteria of the Desulfobulbaceae family can conduct electrons over centimeter-long distances thereby coupling oxygen reduction at the surface of marine sediment to sulfide oxidation in deeper anoxic layers. The ability of these cable bacteria to use alternative electron acceptors is currently unknown. Here we show that these organisms can use also nitrate or nitrite as an electron acceptor thereby coupling the reduction of nitrate to distant oxidation of sulfide. Sulfidic marine sediment was incubated with overlying nitrate-amended anoxic seawater. Within 2 months, electric coupling of spatially segregated nitrate reduction and sulfide oxidation was evident from: (1) the formation of a 4-6-mm-deep zone separating sulfide oxidation from the associated nitrate reduction, and (2) the presence of pH signatures consistent with proton consumption by cathodic nitrate reduction, and proton production by anodic sulfide oxidation. Filamentous Desulfobulbaceae with the longitudinal structures characteristic of cable bacteria were detected in anoxic, nitrate-amended incubations but not in anoxic, nitrate-free controls. Nitrate reduction by cable bacteria using long-distance electron transport to get privileged access to distant electron donors is a hitherto unknown mechanism in nitrogen and sulfur transformations, and the quantitative importance for elements cycling remains to be addressed.

Authors+Show Affiliations

Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.1] Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark [2] Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.1] Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark [2] Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark.1] Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark [2] Aarhus Institute of Advanced Studies, Aarhus University, Aarhus, Denmark.1] Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark [2] Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.1] Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark [2] Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.1] Section for Microbiology, Department of Bioscience, Aarhus University, Aarhus, Denmark [2] Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus, Denmark.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24577351

Citation

Marzocchi, Ugo, et al. "Electric Coupling Between Distant Nitrate Reduction and Sulfide Oxidation in Marine Sediment." The ISME Journal, vol. 8, no. 8, 2014, pp. 1682-90.
Marzocchi U, Trojan D, Larsen S, et al. Electric coupling between distant nitrate reduction and sulfide oxidation in marine sediment. ISME J. 2014;8(8):1682-90.
Marzocchi, U., Trojan, D., Larsen, S., Meyer, R. L., Revsbech, N. P., Schramm, A., Nielsen, L. P., & Risgaard-Petersen, N. (2014). Electric coupling between distant nitrate reduction and sulfide oxidation in marine sediment. The ISME Journal, 8(8), 1682-90. https://doi.org/10.1038/ismej.2014.19
Marzocchi U, et al. Electric Coupling Between Distant Nitrate Reduction and Sulfide Oxidation in Marine Sediment. ISME J. 2014;8(8):1682-90. PubMed PMID: 24577351.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electric coupling between distant nitrate reduction and sulfide oxidation in marine sediment. AU - Marzocchi,Ugo, AU - Trojan,Daniela, AU - Larsen,Steffen, AU - Meyer,Rikke Louise, AU - Revsbech,Niels Peter, AU - Schramm,Andreas, AU - Nielsen,Lars Peter, AU - Risgaard-Petersen,Nils, Y1 - 2014/02/27/ PY - 2013/09/23/received PY - 2014/01/06/revised PY - 2014/01/17/accepted PY - 2014/3/1/entrez PY - 2014/3/1/pubmed PY - 2014/12/15/medline SP - 1682 EP - 90 JF - The ISME journal JO - ISME J VL - 8 IS - 8 N2 - Filamentous bacteria of the Desulfobulbaceae family can conduct electrons over centimeter-long distances thereby coupling oxygen reduction at the surface of marine sediment to sulfide oxidation in deeper anoxic layers. The ability of these cable bacteria to use alternative electron acceptors is currently unknown. Here we show that these organisms can use also nitrate or nitrite as an electron acceptor thereby coupling the reduction of nitrate to distant oxidation of sulfide. Sulfidic marine sediment was incubated with overlying nitrate-amended anoxic seawater. Within 2 months, electric coupling of spatially segregated nitrate reduction and sulfide oxidation was evident from: (1) the formation of a 4-6-mm-deep zone separating sulfide oxidation from the associated nitrate reduction, and (2) the presence of pH signatures consistent with proton consumption by cathodic nitrate reduction, and proton production by anodic sulfide oxidation. Filamentous Desulfobulbaceae with the longitudinal structures characteristic of cable bacteria were detected in anoxic, nitrate-amended incubations but not in anoxic, nitrate-free controls. Nitrate reduction by cable bacteria using long-distance electron transport to get privileged access to distant electron donors is a hitherto unknown mechanism in nitrogen and sulfur transformations, and the quantitative importance for elements cycling remains to be addressed. SN - 1751-7370 UR - https://www.unboundmedicine.com/medline/citation/24577351/Electric_coupling_between_distant_nitrate_reduction_and_sulfide_oxidation_in_marine_sediment_ L2 - https://doi.org/10.1038/ismej.2014.19 DB - PRIME DP - Unbound Medicine ER -