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Plant Physiology 58:636-643 (1976)
© 1976 American Society of Plant Biologists

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Articles

Turgor Pressure Sensing in Plant Cell Membranes 1

Hans G. L. Costera

Ernst Steudleb and Ulrich Zimmermannb

a Biophysics Laboratory, School of Physics, The University of New South Wales, Kensington, N.S.W. 2033 Australia, b Institut für Biophysikalische Chemie, Kernforschungsanlage GmbH Jülich, D5170 Jülich, Postfach 1913, Federal Republic of Germany

Experimental evidence is reviewed which shows that the cell membrane is compressible by both mechanical and electrical forces. Calculations are given which show that significant changes in the thickness of cell membranes can occur as a result of (a) direct compression due to the turgor pressure; (b) indirect effects due to the stretching of the cell wall; and (c) the stresses induced by the electric field in the membrane.

Such changes in the membrane thickness may provide the pressure-transducing mechanism required for osmoregulation and growth. An important feature of the model is that this pressure transduction can occur not only in the plasmalemma (where there is a pressure gradient), but also in the tonoplast.

1 This work was supported by a grant from the Deutsche Forschungs-gemeinschaft, Sonderforschungsbereich 160, to U. Z., and by a grant from the Australian Research Grants Committee to H. G. L. C. Part of this work was done while H. G. L. C. was on leave at the Kernforschungsanlage Jülich and when U. Z. was on leave at The University of New South Wales.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists