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Plant and Cell Physiology, 1980, Vol. 21, No. 6 1007-1013
© 1980

Article

Dependency of H+ efflux on ATP in cells of Chara australis

Teruo Shimmen and Masashi Tazawa

Department of Botany, Faculty of Science, University of Tokyo Hongo, Bunkyo-ku, Tokyo 113, Japan

The internodal cell of Chara australis was made tonoplast-free by internal perfusion with a medium containing a Ca2+-chelator EGTA and the net H+ efflux across the plasma membrane was estimated either by titration of the external medium or by measuring the change in pH in the external medium. The amount of H+ efflux was high in the presence of internal ATP and low in its absence. The ATP-dependent net H+ efflux was about 40 nmoles/m2/sec. This amount is smaller than that estimated for the pump current on the basis of electrical data obtained earlier (3). This discrepancy is discussed.

(Received June 18, 1980; )
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