Fungal necromass presents a high potential for Mercury immobilization in soil

Francois L Maillard; Stéphane Pflender; Katherine A. Heckman; Michel Chalot; Peter G. Kennedy

doi:10.1016/j.chemosphere.2022.136994

Fungal necromass presents a high potential for Mercury immobilization in soil

Francois L Maillard, Stéphane Pflender, Katherine A. Heckman, Michel Chalot, Peter G. Kennedy

Plant and Microbial Biology

Research output: Contribution to journal › Article › peer-review

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Abstract

Past industrial activities have generated many contaminated lands from which Mercury (Hg) escapes, primarily by volatilization. Current phytomanagement techniques aim to limit Hg dispersion by increasing its stabilization in soil. Although soil fungi represent a source of Hg emission associated with biovolatilization mechanisms, there is limited knowledge about how dead fungal residues (i.e., fungal necromass) interact with soil Hg. This study determined the Hg biosorption potential of fungal necromass and the chemical drivers of passive Hg binding with dead mycelia. Fungal necromass was incubated under field conditions with contrasting chemical properties at a well-characterized Hg phytomanagement experimental site in France. After four months of incubation in soil, fungal residues passively accumulated substantial quantities of Hg in their recalcitrant fractions ranging from 400 to 4500 μg Hg/kg. In addition, infrared spectroscopy revealed that lipid compounds explained the amount of Hg biosorption to fungal necromass. Based on these findings, we propose that fungal necromass is likely an important factor in Hg immobilization in soil.

Original language	English (US)
Article number	136994
Journal	Chemosphere
Volume	311
DOIs	https://doi.org/10.1016/j.chemosphere.2022.136994
State	Published - Jan 2023

Bibliographical note

Funding Information:
We thank the two reviewers for their helpful comments on our manuscript. The authors also thank the U.S. National Science Foundation (# DEB 2038293 ) and the French ANR (# 2010-INTB- 1703-03 BIOFILTREE) for financial support. Finally, we also thank the Genomic Science Program (U.S. Department of Energy) Plant Microbe Interfaces (PMI) Scientific Focus Area ( http://pmi.ornl.gov/ ) for providing the Meliniomyces strain used in this study.

Funding Information:
We thank the two reviewers for their helpful comments on our manuscript. The authors also thank the U.S. National Science Foundation (#DEB 2038293) and the French ANR (#2010-INTB- 1703-03 BIOFILTREE) for financial support. Finally, we also thank the Genomic Science Program (U.S. Department of Energy) Plant Microbe Interfaces (PMI) Scientific Focus Area (http://pmi.ornl.gov/) for providing the Meliniomyces strain used in this study.

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

Fungal necromass
Hg biosorption
Hg cycle
Phytostabilization

PubMed: MeSH publication types

Journal Article

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.chemosphere.2022.136994

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title = "Fungal necromass presents a high potential for Mercury immobilization in soil",

abstract = "Past industrial activities have generated many contaminated lands from which Mercury (Hg) escapes, primarily by volatilization. Current phytomanagement techniques aim to limit Hg dispersion by increasing its stabilization in soil. Although soil fungi represent a source of Hg emission associated with biovolatilization mechanisms, there is limited knowledge about how dead fungal residues (i.e., fungal necromass) interact with soil Hg. This study determined the Hg biosorption potential of fungal necromass and the chemical drivers of passive Hg binding with dead mycelia. Fungal necromass was incubated under field conditions with contrasting chemical properties at a well-characterized Hg phytomanagement experimental site in France. After four months of incubation in soil, fungal residues passively accumulated substantial quantities of Hg in their recalcitrant fractions ranging from 400 to 4500 μg Hg/kg. In addition, infrared spectroscopy revealed that lipid compounds explained the amount of Hg biosorption to fungal necromass. Based on these findings, we propose that fungal necromass is likely an important factor in Hg immobilization in soil.",

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note = "Funding Information: We thank the two reviewers for their helpful comments on our manuscript. The authors also thank the U.S. National Science Foundation (# DEB 2038293 ) and the French ANR (# 2010-INTB- 1703-03 BIOFILTREE) for financial support. Finally, we also thank the Genomic Science Program (U.S. Department of Energy) Plant Microbe Interfaces (PMI) Scientific Focus Area ( http://pmi.ornl.gov/ ) for providing the Meliniomyces strain used in this study. Funding Information: We thank the two reviewers for their helpful comments on our manuscript. The authors also thank the U.S. National Science Foundation (#DEB 2038293) and the French ANR (#2010-INTB- 1703-03 BIOFILTREE) for financial support. Finally, we also thank the Genomic Science Program (U.S. Department of Energy) Plant Microbe Interfaces (PMI) Scientific Focus Area (http://pmi.ornl.gov/) for providing the Meliniomyces strain used in this study. Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

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AU - Chalot, Michel

AU - Kennedy, Peter G.

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N2 - Past industrial activities have generated many contaminated lands from which Mercury (Hg) escapes, primarily by volatilization. Current phytomanagement techniques aim to limit Hg dispersion by increasing its stabilization in soil. Although soil fungi represent a source of Hg emission associated with biovolatilization mechanisms, there is limited knowledge about how dead fungal residues (i.e., fungal necromass) interact with soil Hg. This study determined the Hg biosorption potential of fungal necromass and the chemical drivers of passive Hg binding with dead mycelia. Fungal necromass was incubated under field conditions with contrasting chemical properties at a well-characterized Hg phytomanagement experimental site in France. After four months of incubation in soil, fungal residues passively accumulated substantial quantities of Hg in their recalcitrant fractions ranging from 400 to 4500 μg Hg/kg. In addition, infrared spectroscopy revealed that lipid compounds explained the amount of Hg biosorption to fungal necromass. Based on these findings, we propose that fungal necromass is likely an important factor in Hg immobilization in soil.

AB - Past industrial activities have generated many contaminated lands from which Mercury (Hg) escapes, primarily by volatilization. Current phytomanagement techniques aim to limit Hg dispersion by increasing its stabilization in soil. Although soil fungi represent a source of Hg emission associated with biovolatilization mechanisms, there is limited knowledge about how dead fungal residues (i.e., fungal necromass) interact with soil Hg. This study determined the Hg biosorption potential of fungal necromass and the chemical drivers of passive Hg binding with dead mycelia. Fungal necromass was incubated under field conditions with contrasting chemical properties at a well-characterized Hg phytomanagement experimental site in France. After four months of incubation in soil, fungal residues passively accumulated substantial quantities of Hg in their recalcitrant fractions ranging from 400 to 4500 μg Hg/kg. In addition, infrared spectroscopy revealed that lipid compounds explained the amount of Hg biosorption to fungal necromass. Based on these findings, we propose that fungal necromass is likely an important factor in Hg immobilization in soil.

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Fungal necromass presents a high potential for Mercury immobilization in soil

Abstract

Bibliographical note

Keywords

PubMed: MeSH publication types

UN SDGs

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