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A Novel "Microbial Bait" Technique for Capturing Fe(III)-Reducing Bacteria.

Babajide Milton Macaulay^1,2,3, Christopher Boothman^1,2, Bart E van Dongen^1,2

¹Department of Earth and Environmental Sciences, The University of Manchester, Manchester, United Kingdom.

Frontiers in Microbiology

|March 29, 2020

Summary

This summary is machine-generated.

Researchers developed novel Fe(III)-coated pumice microbe-baits to capture iron-reducing bacteria from freshwater springs. This method enriches specific bacterial groups like Deltaproteobacteria and aids in studying microbe-mineral interactions.

Keywords:

DIRB Desulfovibrio Geobacter Rhodoferax akaganeite magnetite pumice

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Area of Science:

Geochemistry
Microbiology
Environmental Science

Background:

Microbial iron(III) reduction is crucial in anoxic environments, influencing organic matter degradation and metal mobility.
Effective methods for capturing iron(III)-reducing microorganisms from natural settings are needed for detailed analysis.

Purpose of the Study:

To develop and validate a novel method for capturing iron(III)-reducing bacteria using Fe(III)-coated pumice microbe-baits.
To identify microbial communities enriched by the microbe-baits under different conditions.
To investigate microbe-mineral interactions during iron reduction.

Main Methods:

Pumice particles were coated with akaganeite, a bioavailable Fe(III) mineral.
Coated pumice was deployed in a freshwater spring for 2 months.
Retrieved microbe-baits were incubated in microcosms with and without electron donors (lactate, acetate).
16S rRNA gene sequencing and Transmission Electron Microscopy with Energy Dispersive Spectroscopy (TEM-EDS) were used for analysis.

Main Results:

Fe(III)-coated pumice microbe-baits successfully enriched for iron(III)-reducing bacteria.
In the presence of lactate and acetate, Deltaproteobacteria (Geobacter, Desulfovibrio) were dominant.
In the absence of added electron donors, Betaproteobacteria, including a Rhodoferax ferrireducens relative, were abundant.
Biogenic magnetite (Fe(II) mineral) was formed when electron donors were present.

Conclusions:

Fe(III)-coated pumice microbe-baits are effective for targeting and enriching specific iron-reducing bacteria from field samples.
This method facilitates culture-dependent studies and enhances understanding of nano-scale microbe-mineral interactions in aquifers.