Reassessment of the Microbial Role in Mn-Fe Nodule Genesis in Andean Paleosols

Mahaney, William C.; Krinsley, David H.; Allen, Christopher C. R.; Ditto, Jeffrey; Langworthy, Kurt; Batchelor, A. D.; LeCompte, Malcolm A.; Milner, Michael W.; Hart, Kris M.; O’Reilly, Shane S.; Kelleher, Brian P.; Hancock, R. G. V.

doi:10.1080/01490451.2014.920939

Geomicrobiology Journal

2014

DOI: 10.1080/01490451.2014.920939

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Reassessment of the Microbial Role in Mn-Fe Nodule Genesis in Andean Paleosols

William C. Mahaney

David H. Krinsley

Christopher C. R. Allen³

et al.

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Cited by 5 publications

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“…In addition to their involvement in manganese cycling, Mn(II)-oxidizing bacteria are thought to have contributed in large part to the formation of natural manganese deposits around the world, including deep-sea manganese nodules (28,29) and ore bodies (30,31). Biogenic manganese oxides also have considerable potential biotechnological applications.…”

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Production of Manganese Oxide Nanoparticles by Shewanella Species

Wright

Farooqui

White

et al. 2016

Appl Environ Microbiol

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Several species of the bacterial genus Shewanella are well-known dissimilatory reducers of manganese under anaerobic conditions. In fact, Shewanella oneidensis is one of the most well studied of all metal-reducing bacteria. In the current study, a number of Shewanella strains were tested for manganese-oxidizing capacity under aerobic conditions. All were able to oxidize Mn(II) and to produce solid dark brown manganese oxides. Shewanella loihica strain PV-4 was the strongest oxidizer, producing oxides at a rate of 20.3 mg/liter/day and oxidizing Mn(II) concentrations of up to 9 mM. In contrast, S. oneidensis MR-1 was the weakest oxidizer tested, producing oxides at 4.4 mg/liter/day and oxidizing up to 4 mM Mn(II). Analysis of products from the strongest oxidizers, i.e., S. loihica PV-4 and Shewanella putrefaciens CN-32, revealed finely grained, nanosize, poorly crystalline oxide particles with identical Mn oxidation states of 3.86. The biogenic manganese oxide products could be subsequently reduced within 2 days by all of the Shewanella strains when culture conditions were made anoxic and an appropriate nutrient (lactate) was added. While Shewanella species were detected previously as part of manganese-oxidizing consortia in natural environments, the current study has clearly shown manganese-reducing Shewanella species bacteria that are able to oxidize manganese in aerobic cultures. IMPORTANCEMembers of the genus Shewanella are well known as dissimilatory manganese-reducing bacteria. This study shows that a number of species from Shewanella are also capable of manganese oxidation under aerobic conditions. Characterization of the products of the two most efficient oxidizers, S. loihica and S. putrefaciens, revealed finely grained, nanosize oxide particles. With a change in culture conditions, the manganese oxide products could be subsequently reduced by the same bacteria. The ability of Shewanella species both to oxidize and to reduce manganese indicates that the genus plays a significant role in the geochemical cycling of manganese. Due to the high affinity of manganese oxides for binding other metals, these bacteria may also contribute to the immobilization and release of other metals in the environment.

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Production of Manganese Oxide Nanoparticles by Shewanella Species

Wright

Farooqui

White

et al. 2016

Appl Environ Microbiol

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Fe-Mn concretions and nodules formation in redoximorphic soils and their role on soil phosphorus dynamics: Current knowledge and gaps

Gasparatos

Massas

Γοδελίτσας

2019

CATENA

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Molecular mechanisms and biomineralization processes of ferromanganese nodule formation: Insights its effect on nutrient imbalance and heavy metal immobilization in native soil profiles

Ali,

Koner,

Hussain

et al. 2025

Earth-Science Reviews

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Reassessment of the Microbial Role in Mn-Fe Nodule Genesis in Andean Paleosols

Cited by 5 publications

References 39 publications

Production of Manganese Oxide Nanoparticles by Shewanella Species

Production of Manganese Oxide Nanoparticles by Shewanella Species

Fe-Mn concretions and nodules formation in redoximorphic soils and their role on soil phosphorus dynamics: Current knowledge and gaps

Molecular mechanisms and biomineralization processes of ferromanganese nodule formation: Insights its effect on nutrient imbalance and heavy metal immobilization in native soil profiles

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