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Development of an electrostatic model predicting copper toxicity to plants

Peng Wang, Karel De Schamphelaere UGent, Peter M Kopittke, Dong-Mei Zhou, Willie JGM Peijnenburg and Koen Lock UGent (2012) JOURNAL OF EXPERIMENTAL BOTANY. 63(2). p.659-668
abstract
The focus of the present study was to investigate the mechanisms for the alleviation of Cu toxicity in plants by coexistent cations (e.g. Al3+, Mn2+, Ca2+, Mg2+, H+, Na+, and K+) and the development of an electrostatic model to predict 50% effect activities (EA50s) accurately. The alleviation of Cu2+ toxicity was evaluated in several plants in terms of (i) the electrical potential at the outer surface of the plasma membrane (PM) (Psi<sub arrange="stack">0 degrees) and (ii) competition between cations for sites at the PM involved in the uptake or toxicity of Cu2+, the latter of which is invoked by the Biotic Ligand Model (BLM) as the sole explanation for the alleviation of toxicity. The addition of coexistent cations into the bulk-phase medium reduces the negativity of Psi<sub arrange="stack">0 degrees and hence decreases the activity of Cu2+ at the PM surface. Our analyses suggest that the alleviation of toxicity results primarily from electrostatic effects (i.e. changes in both the Cu2+ activity at the PM surface and the electrical driving force across the PM), and that BLM-type competitive effects may be of lesser importance in plants. Although this does not exclude the possibility of competition, the data highlight the importance of electrostatic effects. An electrostatic model was developed to predict Cu2+ toxicity thresholds (EA50s), and the quality of its predictive capacity suggests its potential utility in risk assessment of copper in natural waters and soils.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
electrostatic effects, plasma membrane, Biotic ligand model, copper toxicity, surface electric potential, BIOTIC LIGAND MODEL, SURFACE ELECTRICAL POTENTIALS, BARLEY HORDEUM-VULGARE, SOLUTION CULTURE, ROOT ELONGATION, CELL MEMBRANES, PH, BIOAVAILABILITY, PHYTOTOXICITY, MAGNESIUM
journal title
JOURNAL OF EXPERIMENTAL BOTANY
J. Exp. Bot.
volume
63
issue
2
pages
659 - 668
Web of Science type
Article
Web of Science id
000299094700011
JCR category
PLANT SCIENCES
JCR impact factor
5.242 (2012)
JCR rank
13/193 (2012)
JCR quartile
1 (2012)
ISSN
0022-0957
DOI
10.1093/jxb/err254
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2913011
handle
http://hdl.handle.net/1854/LU-2913011
date created
2012-06-20 09:52:16
date last changed
2012-06-21 14:30:14
@article{2913011,
  abstract     = {The focus of the present study was to investigate the mechanisms for the alleviation of Cu toxicity in plants by coexistent cations (e.g. Al3+, Mn2+, Ca2+, Mg2+, H+, Na+, and K+) and the development of an electrostatic model to predict 50\% effect activities (EA50s) accurately. The alleviation of Cu2+ toxicity was evaluated in several plants in terms of (i) the electrical potential at the outer surface of the plasma membrane (PM) (Psi{\textlangle}sub arrange={\textacutedbl}stack{\textacutedbl}{\textrangle}0 degrees) and (ii) competition between cations for sites at the PM involved in the uptake or toxicity of Cu2+, the latter of which is invoked by the Biotic Ligand Model (BLM) as the sole explanation for the alleviation of toxicity. The addition of coexistent cations into the bulk-phase medium reduces the negativity of Psi{\textlangle}sub arrange={\textacutedbl}stack{\textacutedbl}{\textrangle}0 degrees and hence decreases the activity of Cu2+ at the PM surface. Our analyses suggest that the alleviation of toxicity results primarily from electrostatic effects (i.e. changes in both the Cu2+ activity at the PM surface and the electrical driving force across the PM), and that BLM-type competitive effects may be of lesser importance in plants. Although this does not exclude the possibility of competition, the data highlight the importance of electrostatic effects. An electrostatic model was developed to predict Cu2+ toxicity thresholds (EA50s), and the quality of its predictive capacity suggests its potential utility in risk assessment of copper in natural waters and soils.},
  author       = {Wang, Peng and De Schamphelaere, Karel and Kopittke, Peter M and Zhou, Dong-Mei and Peijnenburg, Willie JGM and Lock, Koen},
  issn         = {0022-0957},
  journal      = {JOURNAL OF EXPERIMENTAL BOTANY},
  keyword      = {electrostatic effects,plasma membrane,Biotic ligand model,copper toxicity,surface electric potential,BIOTIC LIGAND MODEL,SURFACE ELECTRICAL POTENTIALS,BARLEY HORDEUM-VULGARE,SOLUTION CULTURE,ROOT ELONGATION,CELL MEMBRANES,PH,BIOAVAILABILITY,PHYTOTOXICITY,MAGNESIUM},
  language     = {eng},
  number       = {2},
  pages        = {659--668},
  title        = {Development of an electrostatic model predicting copper toxicity to plants},
  url          = {http://dx.doi.org/10.1093/jxb/err254},
  volume       = {63},
  year         = {2012},
}

Chicago
Wang, Peng, Karel De Schamphelaere, Peter M Kopittke, Dong-Mei Zhou, Willie JGM Peijnenburg, and Koen Lock. 2012. “Development of an Electrostatic Model Predicting Copper Toxicity to Plants.” Journal of Experimental Botany 63 (2): 659–668.
APA
Wang, Peng, De Schamphelaere, K., Kopittke, P. M., Zhou, D.-M., Peijnenburg, W. J., & Lock, K. (2012). Development of an electrostatic model predicting copper toxicity to plants. JOURNAL OF EXPERIMENTAL BOTANY, 63(2), 659–668.
Vancouver
1.
Wang P, De Schamphelaere K, Kopittke PM, Zhou D-M, Peijnenburg WJ, Lock K. Development of an electrostatic model predicting copper toxicity to plants. JOURNAL OF EXPERIMENTAL BOTANY. 2012;63(2):659–68.
MLA
Wang, Peng, Karel De Schamphelaere, Peter M Kopittke, et al. “Development of an Electrostatic Model Predicting Copper Toxicity to Plants.” JOURNAL OF EXPERIMENTAL BOTANY 63.2 (2012): 659–668. Print.