Bonneville, S, Bray, AW and Benning, LG (2016) Structural Fe(II) oxidation in biotite by an ectomycorrhizal fungi drives mechanical forcing. Environmental Science & Technology, 50 (11). pp. 5589-5596. ISSN 0013-936X
Abstract
Microorganisms are essential agents of Earth’s soil weathering engine who help transform primary rock-forming minerals into soils. Mycorrhizal fungi, with their vast filamentous networks in symbiosis with the roots of most plants can alter a large number of minerals via local acidification, targeted excretion of ligands, submicron-scale biomechanical forcing and mobilization of Mg, Fe, Al and K at the hypha-biotite interface. Here, we present experimental evidence that Paxillus involutus –a basidiomycete fungus- in ectomycorrhizal symbiosis with Scots pine (Pinus sylvestris), is able to oxidize a substantial amount of structural Fe(II) in biotite. Iron redox chemistry, quantified by X-ray Absorption Near Edge Spectra on 13 fungi-biotite sections along three distinct hypha colonizing the [001] basal plane of biotite, revealed variable but extensive Fe(II) oxidation up to ~ 2µm in depth and a Fe(III)/Fetotal ratio of up to ~0.8. The growth of Fe(III) hydroxide implies a volumetric change and a strain within the biotite lattice potentially large enough to induce micro-crack formation, which are abundant below the hypha-biotite interface. This Fe(II) oxidation also leads to the formation of a large pool of Fe(III) (i.e., structural Fe(III) and Fe(III) oxyhydroxides) within biotite that could participate in the Fe redox cycling in soils.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2016, American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Environmental Science & Technology after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.est.5b06178. |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 12 May 2016 11:15 |
Last Modified: | 18 Jul 2017 19:49 |
Published Version: | http://dx.doi.org/10.1021/acs.est.5b06178 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acs.est.5b06178 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:99587 |