Electrophysiological Measurements on the Root ofAtriplex hastata

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Abstract
The ion contents and membrane potentials of the cells of young, hydroponically cultured seedlings of Atriplex hastata L. var. salina, Wallr. have been measured at several different NaCl concentrations. The total tissue concentrations of Na+ and Cl− increase as external NaCl increases, but there is always a marked excess of internal Na+ over Cl−; this is balanced by endogenous organic anion formation with a concomitant extrusion of H+ to the bathing solution. Membrane potentials of the root cells remain essentially invariant with changes in external NaCl at approx. –130 mV; there is no evidence of a radial gradient of potential across the root. The potential seems to contain a cyanide-sensitive electrogenic component, also invariant with NaCl concentration, of about –70 mV, and a diffusion component. The electrogenic component seems likely to be a H+ efflux, probably through a H+ uniport ATPase.

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