Ion Specificity of Na+-Transporting Systems in the Plasma Membrane of the Halotolerant Alga Tetraselmis (Platymonas) viridis

Ion Specificity of Na+-Transporting Systems in the Plasma Membrane of the Halotolerant Alga... Vesicular preparations of plasma membranes (PM) from the microalga Tetraselmis (Platymonas) viridisRouch were used to investigate the ion specificity of the Na+/H+antiporter and Na+-translocating ATPase, two Na+-transporting systems previously identified functionally by our studies of T. viridisPM. The Na+/H+antiporter and Na+-ATPase were shown to translocate, with similar efficiencies, Na+and Li+across the membrane, whereas other cations, such as K+, Rb+, and Cs+, were not transported by these systems. Transport of the latter cations across PM of T. viridisoccurred through the ion channels of PM, which were apparently selective for K+. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Ion Specificity of Na+-Transporting Systems in the Plasma Membrane of the Halotolerant Alga Tetraselmis (Platymonas) viridis

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2001 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1016645829002
Publisher site
See Article on Publisher Site

Abstract

Vesicular preparations of plasma membranes (PM) from the microalga Tetraselmis (Platymonas) viridisRouch were used to investigate the ion specificity of the Na+/H+antiporter and Na+-translocating ATPase, two Na+-transporting systems previously identified functionally by our studies of T. viridisPM. The Na+/H+antiporter and Na+-ATPase were shown to translocate, with similar efficiencies, Na+and Li+across the membrane, whereas other cations, such as K+, Rb+, and Cs+, were not transported by these systems. Transport of the latter cations across PM of T. viridisoccurred through the ion channels of PM, which were apparently selective for K+.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 10, 2004

References

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