Plasma membrane surface potential: Dual effects upon ion uptake and toxicity

Wang, P, Kinraide, TB, Zhou, DM, Kopittke, PM and Peijnenburg, WJGM (2011) Plasma membrane surface potential: Dual effects upon ion uptake and toxicity. Plant Physiology, 155 2: 808-820. doi:10.1104/pp.110.165985

Author Wang, P
Kinraide, TB
Zhou, DM
Kopittke, PM
Peijnenburg, WJGM
Title Plasma membrane surface potential: Dual effects upon ion uptake and toxicity
Journal name Plant Physiology   Check publisher's open access policy
ISSN 0032-0889
Publication date 2011-02-01
Year available 2010
Sub-type Article (original research)
DOI 10.1104/pp.110.165985
Volume 155
Issue 2
Start page 808
End page 820
Total pages 13
Place of publication Rockville, MD, U.S.A.
Publisher American Society of Plant Biologists
Language eng
Formatted abstract
Electrical properties of plasma membranes (PMs), partially controlled by the ionic composition of the exposure medium, play significant roles in the distribution of ions at the exterior surface of PMs and in the transport of ions across PMs. The effects of coexisting cations (commonly Al3+, Ca2+, Mg2+, H+, and Na+) on the uptake and toxicity of these and other ions (such as Cu2+, Zn2+, Ni2+, Cd2+, and H2AsO4) to plants were studied in terms of the electrical properties of PMs. Increased concentrations of cations or decreased pH in rooting media, whether in solution culture or in soils, reduced the negativity of the electrical potential at the PM exterior surface (ψ0°). This reduction decreased the activities of metal cations at the PM surface and increased the activities of anions such as H2AsO4−. Furthermore, the reduced ψ0° negativity increased the surface-to-surface transmembrane potential difference, thus increasing the electrical driving force for cation uptake and decreasing the driving force for anion uptake across PMs. Analysis of measured uptake and toxicity of ions using electrostatic models provides evidence that uptake and toxicity are functions of the dual effects of ψ0° (i.e. altered PM surface ion activity and surface-to-surface transmembrane potential difference gradient). This study provides novel insights into the mechanisms of plant-ion interactions and extends current theory to evaluate ion bioavailability and toxicity, indicating its potential utility in risk assessment of metal(loid)s in natural waters and soils.
Keyword Barley Hordeum-vulgare
Biotic ligand model
Electrical potentials
Root elongation
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 40871115
BK 2009339
Institutional Status UQ
Additional Notes Published online before print November 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 46 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 46 times in Scopus Article | Citations
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Created: Sun, 20 Mar 2011, 10:03:17 EST