Schmalenberger, A, Duran, AL, Bray, AW et al. (6 more authors) (2015) Oxalate secretion by ectomycorrhizal Paxillus involutus is mineral-specific and controls calcium weathering from minerals. Scientific Reports, 5. 12187. ISSN 2045-2322
Abstract
Trees and their associated rhizosphere organisms play a major role in mineral weathering driving calcium fluxes from the continents to the oceans that ultimately control long-term atmospheric CO 2 and climate through the geochemical carbon cycle. Photosynthate allocation to tree roots and their mycorrhizal fungi is hypothesized to fuel the active secretion of protons and organic chelators that enhance calcium dissolution at fungal-mineral interfaces. This was tested using 14 CO 2 supplied to shoots of Pinus sylvestris ectomycorrhizal with the widespread fungus Paxillus involutus in monoxenic microcosms, revealing preferential allocation by the fungus of plant photoassimilate to weather grains of limestone and silicates each with a combined calcium and magnesium content of over 10 wt.%. Hyphae had acidic surfaces and linear accumulation of weathered calcium with secreted oxalate, increasing significantly in sequence: quartz, granite < basalt, olivine, limestone < gabbro. These findings confirmed the role of mineral-specific oxalate exudation in ectomycorrhizal weathering to dissolve calcium bearing minerals, thus contributing to the geochemical carbon cycle.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015, The Author(s). Creative Commons Attribution 4.0 International License. |
Keywords: | Weathering; Ectomycorrhizal Fungus; Minerals |
Dates: |
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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) |
Funding Information: | Funder Grant number NERC NE/C004566/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Jul 2015 10:47 |
Last Modified: | 23 Jan 2016 01:38 |
Published Version: | http://dx.doi.org/10.1038/srep12187 |
Status: | Published |
Publisher: | Nature Publishing Group |
Identification Number: | 10.1038/srep12187 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:88441 |