A web-accessible computer program for calculating electrical potentials and ion activities at cell-membrane surfaces

Kopittke, Peter M., Wang, Peng, Menzies, Neal W., Naidu, Ravi and Kinraide, Thomas B. (2014) A web-accessible computer program for calculating electrical potentials and ion activities at cell-membrane surfaces. Plant and Soil, 375 1-2: 35-46. doi:10.1007/s11104-013-1948-x

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Author Kopittke, Peter M.
Wang, Peng
Menzies, Neal W.
Naidu, Ravi
Kinraide, Thomas B.
Title A web-accessible computer program for calculating electrical potentials and ion activities at cell-membrane surfaces
Journal name Plant and Soil   Check publisher's open access policy
ISSN 0032-079X
1573-5036
Publication date 2014
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s11104-013-1948-x
Open Access Status File (Author Post-print)
Volume 375
Issue 1-2
Start page 35
End page 46
Total pages 12
Place of publication Dordrecht, Netherlands
Publisher Springer
Collection year 2014
Language eng
Formatted abstract
Aims: Increasing evidence indicates that plant responses to ions (uptake/transport, inhibition, and alleviation of inhibition) are dependent upon ion activities at the outer surface of root-cell plasma membranes (PMs) rather than activities in the bulk-phase rooting medium.

Methods: A web-accessible computer program was written to calculate the electrical potential (ψ) at the outer surface of root-cell PMs (ψ PM). From these values of ψ PM, activities of ion I with charge Z ({I Z}) can be calculated for the outer surface of the PM ({I Z}PM). In addition, ψ and {I Z} in the Donnan phase of the cell walls (ψ CW and {I Z}CW) can be calculated.

Results: By reanalysing published data, we illustrate how this computer program can assist in the investigation of plant-ion interactions. For example, we demonstrate that in saline solutions, both Ca deficiency and Na uptake are more closely related to {Ca2+}PM and {Na+}PM than to {Ca2+}b and {Na+}b (activities in the bulk-phase media). Additional examples are given for Zn and P nutrition, Ni toxicity, and arsenate uptake.

Conclusions: The computer program presented here should assist others to develop an electrostatic view of plant-ion interactions and to re-evaluate some commonly-held views regarding mechanisms of ion transport, toxicity, competition among ions, and other phenomena.
Keyword Electrical potential
Mineral nutrition
Plant growth
Plant-ion interactions
Plasma membrane
Toxicity
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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