Abstract
IN a previous publication1 some data were presented which were interpreted as indicating that Rb+ ions move through the plasmalemma of barley root cells on a chain of fixed, negative sites of a macromolecule which probably make up part of a charged pore. The results suggested that this passage of Rb+ through the membrane could be slowed down by less mobile ions like Na+ or Ca++. It was suggested, as a corollary, that if such be the case, the movement of a slow ion on such sites could be accelerated by a fast ion. To test this possibility, absorption rates of sodium-24 in the presence of a fast ion, such as K+, were compared with those in the presence of a slower ion like Na+.
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References
Tanada, T., Plant Physiol., 38, 422 (1963).
Tanada, T., Plant Physiol., 39, 593 (1964).
Harris, E. J., Transport and Accumulation in Biological Systems (Butterworth Scientific Publications, London, 1960).
Bange, G. G. J., Plant and Soil., 11, 17 (1959).
Tanada, T., Plant Physiol., 31, 403 (1956).
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TANADA, T. Possible Path of Entry of Cations into Plant Cells. Nature 209, 626–627 (1966). https://doi.org/10.1038/209626a0
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DOI: https://doi.org/10.1038/209626a0
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