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Title: Mechanisms of lichen resistance to metallic pollution

Abstract

Some lichens have a unique ability to grow in heavily contaminated areas due to the development of adaptative mechanisms allowing a high tolerance to metals. Here the authors report on the chemical forms of Pb and Zn in the metal hyperaccumulator Diploschistes muscorum and of Pb in the metal tolerant lichen Xanthoria parietina. The speciation of Zn and Pb has been investigated by powder X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy using the advanced third-generation synchrotron radiation source of the European synchrotron radiation facility (ESRF in Grenoble). This study reveals that in both lichens cells are protected from toxicity by complexation of heavy metals, but the strategies differ: in D. muscorum, Pb and Zn are accumulated through an enhanced synthesis of oxalate, which precipitates toxic elements as insoluble salts, whereas in X. parietina, Pb is complexed to carboxylic groups of the fungal cell walls. The authors conclude that hyperaccumulation of metals results from a reactive mechanism of organic acid production, whereas metallo-tolerance is achieved by a passive complexation to existing functional groups.

Authors:
; ;  [1]; ;  [2];  [3]; ;  [4];  [5]
  1. Univ. of Grenoble and CNRS (France). Environmental Geochemistry Group
  2. Lab. de Botanique et de Cryptogamie, Lille (France)
  3. Institut d`Ecologie, Paris (France)
  4. Univ. of Grenoble and CNRS (France). Environmental Geochemistry Group|[CNRS, Grenoble (France). Lab. de Cristallographie
  5. CNRS, Grenoble (France). Lab. de Cristallographie
Publication Date:
OSTI Identifier:
323750
Resource Type:
Journal Article
Journal Name:
Environmental Science and Technology
Additional Journal Information:
Journal Volume: 32; Journal Issue: 21; Other Information: PBD: 1 Nov 1998
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR POLLUTION; BIOLOGICAL INDICATORS; LICHENS; LEAD; ZINC; GENETIC VARIABILITY; TOLERANCE

Citation Formats

Sarret, C., Manceau, A., Eybert-Berard, L., Cuny, D., Haluwyn, C. van, Deruelle, S., Hazemann, J.L., Menthonnex, J.J., and Soldo, Y. Mechanisms of lichen resistance to metallic pollution. United States: N. p., 1998. Web. doi:10.1021/es970718n.
Sarret, C., Manceau, A., Eybert-Berard, L., Cuny, D., Haluwyn, C. van, Deruelle, S., Hazemann, J.L., Menthonnex, J.J., & Soldo, Y. Mechanisms of lichen resistance to metallic pollution. United States. doi:10.1021/es970718n.
Sarret, C., Manceau, A., Eybert-Berard, L., Cuny, D., Haluwyn, C. van, Deruelle, S., Hazemann, J.L., Menthonnex, J.J., and Soldo, Y. Sun . "Mechanisms of lichen resistance to metallic pollution". United States. doi:10.1021/es970718n.
@article{osti_323750,
title = {Mechanisms of lichen resistance to metallic pollution},
author = {Sarret, C. and Manceau, A. and Eybert-Berard, L. and Cuny, D. and Haluwyn, C. van and Deruelle, S. and Hazemann, J.L. and Menthonnex, J.J. and Soldo, Y.},
abstractNote = {Some lichens have a unique ability to grow in heavily contaminated areas due to the development of adaptative mechanisms allowing a high tolerance to metals. Here the authors report on the chemical forms of Pb and Zn in the metal hyperaccumulator Diploschistes muscorum and of Pb in the metal tolerant lichen Xanthoria parietina. The speciation of Zn and Pb has been investigated by powder X-ray diffraction (XRD) and extended X-ray absorption fine structure (EXAFS) spectroscopy using the advanced third-generation synchrotron radiation source of the European synchrotron radiation facility (ESRF in Grenoble). This study reveals that in both lichens cells are protected from toxicity by complexation of heavy metals, but the strategies differ: in D. muscorum, Pb and Zn are accumulated through an enhanced synthesis of oxalate, which precipitates toxic elements as insoluble salts, whereas in X. parietina, Pb is complexed to carboxylic groups of the fungal cell walls. The authors conclude that hyperaccumulation of metals results from a reactive mechanism of organic acid production, whereas metallo-tolerance is achieved by a passive complexation to existing functional groups.},
doi = {10.1021/es970718n},
journal = {Environmental Science and Technology},
number = 21,
volume = 32,
place = {United States},
year = {1998},
month = {11}
}