A novel approach for predicting the uptake and toxicity of metallic and metalloid ions

Zhou, Dong-Mei and Wang, Peng (2011) A novel approach for predicting the uptake and toxicity of metallic and metalloid ions. Plant Signaling and Behavior, 6 3: 461-465. doi:10.4161/psb.6.3.14745


Author Zhou, Dong-Mei
Wang, Peng
Title A novel approach for predicting the uptake and toxicity of metallic and metalloid ions
Journal name Plant Signaling and Behavior   Check publisher's open access policy
ISSN 1559-2316
1559-2324
Publication date 2011-03
Year available 2011
Sub-type Article (original research)
DOI 10.4161/psb.6.3.14745
Open Access Status
Volume 6
Issue 3
Start page 461
End page 465
Total pages 5
Place of publication Austin, United States
Publisher Landes Bioscience
Language eng
Abstract Electrostatic nature of plant plasma membrane (PM) plays significant roles in the ion uptake and toxicity. Electrical potential at the PM exterior surface (Ψ0 o) influences ion distribution at the PM exterior surface, and the depolarization of Ψ0 o negativity increases the electrical driving force for cation transport, but decreases the driving force for anion transport across the PMs. Assessing environmental risks of toxic ions has been a difficult task because the ion concentration (activity) in medium is not directly corrected to its potential effects. Medium characteristics like the content of major cations have important influences on the bioavailability and toxicity of ions in natural waters and soils. Models such as the Free Ion Activity Model (FIAM) and the Biotic Ligand Model (BLM), as usually employed, neglect the Ψ0 o and hence often lead to false conclusions about interaction mechanisms between toxic ions and major cations for biology. The neglect of Ψ0 o is not inconsistent with its importance, and possibly reflects the difficulty in the measurement of Ψ0 o. Based on the dual effects of the Ψ0 o, electrostatic models were developed to better predict the uptake and toxicity of metallic and metalloid ions. These results suggest that the electrostatic models provides a more robust mechanistic framework to assess metal (loid) ecotoxicity and predict critical metal(loid) concentrations linked to a biological effect, indicating its potential utility in risk assessment of metal(loid)s in water and terrestrial ecosystems.
Keyword Electrostatic models
Ion uptake
Plasma membrane
Risk assessment
Surface electric potential
Toxicity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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Created: Tue, 24 Sep 2013, 17:15:50 EST by Peng Wang on behalf of School of Agriculture and Food Sciences