Separate Oscillations of the Electrogenic Pump and of a K+-Channel inNitellaas Revealed by Simultaneous Measurement of Membrane Potential and of Resistance

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Abstract
In Nitella oscillations of membrane potential with periods of about 15 min and of about 1 h can be observed. The comparison of the related changes in resistance and in potential shows that the 1-h oscillation controls a carrier-type transporter, probably an electrogenic pump with a stoichiometry of 1 H+/1 ATP. The control loop related to the 1-h oscillation can be stimulated by internal pH as changed by butyrate or procaine. IV-curve studies show that the 15-min oscillation modulates the conductivity of a K+ -channel. No way has been found to influence the spontaneously occurring 15-min oscillation which probably is generated in the chioroplasts. The oscillations seem to provide a means of exerting a selective influence on one transporter. Correspondence to: Institut für Angewandte Physik, Neue Universität, Haus N61A, D-2300 Kiel, F.R.G.

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