Evaluation of an electrostatic toxicity model for predicting Ni2+ toxicity to barley root elongation in hydroponic cultures and in soils

Wang, Peng, Kopittke, Peter M., De Schamphelaere, Karel A. C., Zhao, Fang-Jie, Zhou, Dong-Mei, Lock, Koen, Ma, Yi-Bing, Peijnenburg, Willie J. G. M. and McGrath, Steve P. (2011) Evaluation of an electrostatic toxicity model for predicting Ni2+ toxicity to barley root elongation in hydroponic cultures and in soils. New Phytologist, 192 2: 414-427. doi:10.1111/j.1469-8137.2011.03806.x


Author Wang, Peng
Kopittke, Peter M.
De Schamphelaere, Karel A. C.
Zhao, Fang-Jie
Zhou, Dong-Mei
Lock, Koen
Ma, Yi-Bing
Peijnenburg, Willie J. G. M.
McGrath, Steve P.
Title Evaluation of an electrostatic toxicity model for predicting Ni2+ toxicity to barley root elongation in hydroponic cultures and in soils
Formatted title
Evaluation of an electrostatic toxicity model for predicting Ni2+ toxicity to barley root elongation in hydroponic cultures and in soils
Journal name New Phytologist   Check publisher's open access policy
ISSN 0028-646X
1469-8137
Publication date 2011-10
Sub-type Article (original research)
DOI 10.1111/j.1469-8137.2011.03806.x
Volume 192
Issue 2
Start page 414
End page 427
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Collection year 2012
Language eng
Formatted abstract
• Assessing environmental risks of metal contamination in soils is a complex task because the biologically effective concentrations of metals in soils vary widely with soil properties.
• The factors influencing the toxic effect of nickel (Ni) on root growth of barley (Hordeum vulgare) were re-evaluated using published data from both soil and hydroponic cultures. The electrical potential (ψ0o) and ion activities ({Iz}0o) at the outer surfaces of root-cell plasma membranes (PMs) were computed as the basis of the re-evaluation.
• The reanalyses demonstrated that root growth was related to: the Ni2+ activity at the PM surface, ({Ni2+}0o); calcium (Ca) deficiency (related to {Ca2+}0o); osmotic effects; and modification of intrinsic Ni2+ toxicity by magnesium (Mg2+; this appeared to exert an intrinsic (specific) ameliorating effect on intrinsic Ni2+ toxicity). Electrostatic toxicity models (ETM) were developed to relate root growth to these factors (R2 > 0.751).
• Based on the ETM developed in soil culture and a Ni2+ solid–solution partitioning model, critical metal concentrations in soils linked to a biological effect were well predicted for 16 European soils with a wide range of properties, indicating the potential utility of ETM in risk assessment of metals in terrestrial ecosystems.
Keyword Electrostatic toxicity model (ETM)
Magnesium (Mg)
Nickel (Ni)
Osmotic stress
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
 
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