Modeling rhizotoxicity and uptake of Zn and Co singly and in binary mixture in wheat in terms of the cell membrane surface electrical potential

Wang, Yi-Min, Kinraide, Thomas B., Wang, Peng, Zhou, Dong-Mei and Hao, Xiu-Zhen (2013) Modeling rhizotoxicity and uptake of Zn and Co singly and in binary mixture in wheat in terms of the cell membrane surface electrical potential. Environmental Science and Technology, 47 6: 2831-2838. doi:10.1021/es3022107


Author Wang, Yi-Min
Kinraide, Thomas B.
Wang, Peng
Zhou, Dong-Mei
Hao, Xiu-Zhen
Title Modeling rhizotoxicity and uptake of Zn and Co singly and in binary mixture in wheat in terms of the cell membrane surface electrical potential
Journal name Environmental Science and Technology   Check publisher's open access policy
ISSN 0013-936X
1520-5851
Publication date 2013-03-19
Year available 2013
Sub-type Article (original research)
DOI 10.1021/es3022107
Volume 47
Issue 6
Start page 2831
End page 2838
Total pages 8
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2014
Language eng
Formatted abstract
The usually negative, but variable electrical potential (ψ0) at the cell membrane (CM) surface influences the surface activities of free ions and the electrical driving force for the transport of ions across the CM. The rhizotoxic effects and uptake of Zn2+ and Co2+ singly and in binary mixture in wheat (Triticum aestivum L.) at three pH values (4.5, 5.5, or 6.1) were examined in terms of the free ion activities of Zn2+, Co2+, and H+ at the CM surface (these ions are denoted {Mn+}0). Toxicity and uptake of Zn2+ or Co2+ singly to roots were better correlated with {M2+}0 than with their bulk-phase activities. Studies of toxicant interactions using the electrostatic approach and a response-multiplication model for toxicant mixtures indicated that {Co2+}0 significantly enhanced the toxicity of {Zn2+}0, but {Zn2+}0 did not significantly affect the toxicity of {Co2+}0. {H+}0 substantially enhanced the toxicity of both metal ions. Taking ψo into account improved the correspondence (denoted r2) between observed and predicted uptake of both Zn2+ and Co2+, and each inhibited the uptake of the other. Results showed that r2 increased from 0.776 to 0.936 for Zn uptake and improved from 0.805 to 0.951 for Co uptake. Thus electrostatic models for metal toxicity and uptake proved superior to models incorporating only bulk-phase activities of ions.
Keyword Biotic ligand model
Concentration addition
Independent action
Solution culture
Metal toxicity
Zinc
Copper
Cadmium
Cobalt
Growth
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Agriculture and Food Sciences
Official 2014 Collection
 
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