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Baltic Methanosarcina and Clostridium compete for electrons from metallic iron

Paola Andrea Palacios Jaramillo, Oona Snoeyenbos-West, Carolin Regina Löscher, Bo Thamdrup, Amelia-Elena Rotaru
doi: https://doi.org/10.1101/530386
Paola Andrea Palacios Jaramillo
1Department of Biology, University of Southern Denmark, Odense, Denmark
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Oona Snoeyenbos-West
1Department of Biology, University of Southern Denmark, Odense, Denmark
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Carolin Regina Löscher
1Department of Biology, University of Southern Denmark, Odense, Denmark
2Danish Institute for Advanced Study, University of Southern Denmark, Odense, Denmark
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Bo Thamdrup
1Department of Biology, University of Southern Denmark, Odense, Denmark
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Amelia-Elena Rotaru
1Department of Biology, University of Southern Denmark, Odense, Denmark
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  • For correspondence: arotaru@biology.sdu.dk
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Abstract

Microbial induced corrosion of steel structures, used for transport or storage of fuels, chemical weapons or waste radionuclides, is an environmental and economic threat. In non-sulfidic environments, the exact role of methanogens in steel corrosion is poorly understood. From the non-sulfidic, methanogenic sediments of the Baltic Sea corrosive communities were enriched using exclusively Fe0 as electron donor and CO2 as electron acceptor. Methane and acetate production were persistent for three years of successive transfers. Methanosarcina and Clostridium were attached to the Fe0, and dominated metagenome libraries. Since prior reports indicated Methanosarcina were merely commensals, consuming the acetate produced by acetogens, we investigated whether these methanogens were capable of Fe0 corrosion without bacterial partners (inhibited by an antibiotic cocktail). Unassisted, methanogens corroded Fe0 to Fe2+ at similar rates to the mixed community. Surprisingly, in the absence of competitive bacteria, Baltic-Methanosarcina produced six times more methane than they did in the mixed community. This signifies that Baltic-Methanosarcina achieved better corrosion alone, exclusive of an operative bacterial partner. Our results also show that together with acetogens, Methanosarcina interact competitively to retrieve electrons from Fe0 rather than as commensals as previously assumed.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted January 25, 2019.
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Baltic Methanosarcina and Clostridium compete for electrons from metallic iron
Paola Andrea Palacios Jaramillo, Oona Snoeyenbos-West, Carolin Regina Löscher, Bo Thamdrup, Amelia-Elena Rotaru
bioRxiv 530386; doi: https://doi.org/10.1101/530386
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Baltic Methanosarcina and Clostridium compete for electrons from metallic iron
Paola Andrea Palacios Jaramillo, Oona Snoeyenbos-West, Carolin Regina Löscher, Bo Thamdrup, Amelia-Elena Rotaru
bioRxiv 530386; doi: https://doi.org/10.1101/530386

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