Oxalate secretion by ectomycorrhizal Paxillus involutus is mineral-specific and controls calcium weathering from minerals.



Schmalenberger, A ORCID: 0000-0002-7455-3666, Duran, AL, Bray, AW ORCID: 0000-0001-5399-6647, Bridge, J ORCID: 0000-0003-3717-519X, Bonneville, S ORCID: 0000-0001-7523-8222, Benning, LG ORCID: 0000-0001-9972-5578, Romero-Gonzalez, ME ORCID: 0000-0001-5808-5383, Leake, JR ORCID: 0000-0001-8364-7616 and Banwart, SA ORCID: 0000-0001-7223-6678
(2015) Oxalate secretion by ectomycorrhizal Paxillus involutus is mineral-specific and controls calcium weathering from minerals. Scientific reports, 5 (1). 12187-.

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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 CO2 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)CO2 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.

Item Type: Article
Uncontrolled Keywords: Mycorrhizae, Calcium, Minerals, Oxalic Acid, Microscopy, Confocal, Spectroscopy, Fourier Transform Infrared, Spectrometry, X-Ray Emission, Symbiosis
Subjects: ?? Q1 ??
Depositing User: Symplectic Admin
Date Deposited: 16 Oct 2015 08:00
Last Modified: 15 Mar 2024 07:08
DOI: 10.1038/srep12187
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/2031600