Assessment of the Zn-Co mixtures rhizotoxicity under Ca deficiency: Using two conventional mixture models based on the cell membrane surface potential

Wang, Yi-Min, Wang, Peng, Ni, Ling-Fei, Hao, Xiu-Zhen and Zhou, Dong-Mei (2014) Assessment of the Zn-Co mixtures rhizotoxicity under Ca deficiency: Using two conventional mixture models based on the cell membrane surface potential. Chemosphere, 112 232-239. doi:10.1016/j.chemosphere.2014.04.079


Author Wang, Yi-Min
Wang, Peng
Ni, Ling-Fei
Hao, Xiu-Zhen
Zhou, Dong-Mei
Title Assessment of the Zn-Co mixtures rhizotoxicity under Ca deficiency: Using two conventional mixture models based on the cell membrane surface potential
Journal name Chemosphere   Check publisher's open access policy
ISSN 0045-6535
1879-1298
Publication date 2014
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.chemosphere.2014.04.079
Open Access Status
Volume 112
Start page 232
End page 239
Total pages 8
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Abstract Toxicity assessment of Zn-Co mixtures involves multiple ions interactions. The negative potential (ψ0) at the cell membrane surface (CMs) concentrated cationic toxicants (denoted {M2+}0) and influenced the rhizotoxicity of Co2+ or Zn2+. The single and joint rhizotoxicity of Co2+ and Zn2+ to wheat (Triticum aestivum L.) were examined, coupled with different Ca2+ levels. Joint effects of Zn2+, Co2+ and Ca2+ were estimated by the linearly extended concentration addition (CA) and response addition (RA) models. Incorporation of Ca2+ in single metal toxicity assessment significantly enhanced the prediction accuracy (r2 increased from 0.948 to 0.550 for Zn2+ and from 0.903 to 0.611 for Co2+, respectively). ψ0 affected the multiple metals toxicity in both conventional mixture models (r2=0.814 for CA model and 0.820 for RA model). Concretely, {Zn2+}0 alleviated the toxicity of {Co2+}0, while {Co2+}0 had non-significant effect on {Zn2+}0 toxicity. Growth responses to {Ca2+}0 were substantially affected by {Zn2+}0 and {Co2+}0. Ca addition in medium decreased the {M2+}0 by reducing the ψ0 negativity, moreover this addition alleviated Ca deficiency at CMs induced by Zn2+ (or Co2+). These consistent results from both extended CA and RA models indicated that ψ0 provided a novel sight for understanding the rhizotoxicity of multiple metals.
Keyword Ca deficiency
Cell membrane surface potential
Rhizotoxicity
Root growth
Zn Co mixture
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 2015 Collection
 
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