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Plant Physiology 78:1-3 (1985)
© 1985 American Society of Plant Biologists

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Electron Spin Resonance Studies of Ionic Permeability Properties of Thylakoid Membranes of Beta vulgaris and Avicennia germinans1

Marilyn C. Ball2, Rolf J. Mehlhorn, Norman Terry and Lester Packer

Department of Plant and Soil Biology, University of California, Berkeley, California 94720, Department of Physiology-Anatomy, University of California, Berkeley, California 94720, Applied Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720

Measurement of intrathylakoid aqueous volumes by electron spin resonance spectroscopy was used to study ionic permeability properties of thylakoid membranes isolated from Beta vulgaris L. and Avicennia germinans L. The thylakoids behaved as perfect osmometers in the presence of sorbitol and betaine. Thylakoids exposed to hypertonic solutions of NaCl and KCl shrank and subsequently swelled, requiring 10 minutes to regain their original volume. The initial influx rate calculated from the kinetics of changes in intrathylakoid volume in response to 450 millimolar gradients of NaCl and KCl was 2.3 x 10–13 moles per square centimeter per second. These data show that the passive permeability to NaCl and KCl was low.

2 Current address: Department of Biogeography and Geomorphology, Research School of Pacific Studies, P.O. Box 4, Australian National University, Canberra, A.C.T. 2601 Australia.

1 Supported by the University of California, Kearney Foundation of Soil Science, and the Office of Biological Energy Research, Division of Basic Energy Sciences, United States Department of Energy.






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Copyright © 1985 by the American Society of Plant Biologists