The accumulation of electrolytes in plant cells—a suggested mechanism

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Abstract
The suggestions that a membrane composed of a mosaic of areas, some permeable to anions and some to cations, will (a) not let either ions of a salt pass through if there are no ions on the other side to exchange with them, and (b) explain the accumulation of both anions and cations in cell sap, are discussed. Both neglect the fact that ions passing out through one type of area can be balanced electrically by ions of the opposite charge passing out through the other type of area. A possible scheme, based on alternating phases, one of greater permeability to anions and the other of greater permeability to cations, is suggested to explain the accumulation of ions in the cell sap. Existing data on the distribution of ions between sap and external solution, and on potential difference between the 2, are discussed.

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