Al3+ and Ca2+ alteration of membrane permeability of Quercus rubra root cortex cells

This study was undertaken to quantify the effect of aluminum and calcium on membrane permeability. The influence of Ca2+ (0.2-3.7 millimolar) and Al3+ (0-3.7 millimolar) on the permeability of root cortical cells of Quercus rubra was measured using three nonelectrolytes (urea, methyl urea, and ethyl...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1987, Vol.83 (1), p.159-162
Main Authors: ZHAO, X.-J, SUCOFF, E, STADELMANN, E. J
Format: Article
Language:English
Subjects:
Agriculture
aluminio
aluminium
Aluminum
Biological and medical sciences
calcio
calcium
Cell membranes
Cell physiology
Coefficients
cortex
Forest soils
Fundamental and applied biological sciences. Psychology
Lipids
membranas celulares
membrane cellulaire
permeabilidad
permeabilite
permeability
Plant physiology and development
Plant roots
Plasma membrane and permeation
Protoplasts
quercus rubra
racine
raices
roots
Solutes
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Summary:This study was undertaken to quantify the effect of aluminum and calcium on membrane permeability. The influence of Ca2+ (0.2-3.7 millimolar) and Al3+ (0-3.7 millimolar) on the permeability of root cortical cells of Quercus rubra was measured using three nonelectrolytes (urea, methyl urea, and ethyl urea) as permeators of progressively increasing lipid solubility. Water permeability was also measured. Al3+ (a) increased membrane permeability to the nonelectrolytes, (b) decreased the membrane's partiality for lipid permeators, and (c) decreased membrane permeability to water. Ca2+ had effects on permeability that were opposite to those of Al3+. When Al3+ and Ca2+ were tested in combination, these opposite effects counteracted each other. The results suggest that Al3+ altered the architecture of membrane lipids.
ISSN:0032-0889
1532-2548