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Baltic Sea methanogens compete with acetogens for electrons from metallic iron
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Journal Article
Baltic Sea methanogens compete with acetogens for electrons from metallic iron
2019
Overview
Microbially induced corrosion of metallic iron (Fe
0
)-containing structures is an environmental and economic hazard. Methanogens are abundant in low-sulfide environments and yet their specific role in Fe
0
corrosion is poorly understood. In this study,
Sporomusa
and
Methanosarcina
dominated enrichments from Baltic Sea methanogenic sediments that were established with Fe
0
as the sole electron donor and CO
2
as the electron acceptor. The Baltic-
Sporomusa
was phylogenetically affiliated to the electroactive acetogen
S. silvacetica
. Baltic-
Sporomusa
adjusted rapidly to growth on H
2
. On Fe
0
, spent filtrate enhanced growth of this acetogen suggesting that it was using endogenous enzymes to retrieve electrons and produce acetate. Previous studies have proposed that acetate produced by acetogens can feed commensal acetoclastic methanogens such as
Methanosarcina
. However, Baltic-methanogens could not generate methane from acetate, plus the decrease or absence of acetogens stimulated their growth. The decrease in numbers of
Sporomusa
was concurrent with an upsurge in
Methanosarcina
and increased methane production, suggesting that methanogens compete with acetogens for electrons from Fe
0
. Furthermore, Baltic-methanogens were unable to use H
2
(1.5 atm) for methanogenesis and were inhibited by spent filtrate additions, indicating that enzymatically produced H
2
is not a favorable electron donor. We hypothesize that Baltic-methanogens retrieve electrons from Fe
0
via a yet enigmatic direct electron uptake mechanism.
Publisher
Nature Publishing Group UK,Oxford University Press
Subject
