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Plant and Cell Physiology, 1984, Vol. 25, No. 6 965-974
© 1984

Article

Potassium and Chloride Effluxes during Excitation of Characeae Cells

Munehiro Kikuyama1, Kenji Oda2, Teruo Shimmen3, Tomio Hayama4 and Masashi Tazawa3

1Faculty of Pharmacology, Niigata College of Pharmacy Kamishin-ei-cho, Niigata 950-21, Japan
2Faculty of Education, Fukushima University Matsukawa-machi, Fukushima 960-12, Japan
3Department of Botany, Faculty of Science, University of Tokyo Hongo, Tokyo 113, Japan
4Faculty of Medicine, Kumamoto University Honjo, Kumamoto 860, Japan

Action potentials of intact and tonoplast-free Characeae cells were studied in relation to the effluxes of K$ and Cl-. K$ efflux was monitored by atomic absorption spectroscopy or direct measurement of 42K efflux. Cl- efflux was monitored by the Ag-AgCl electrode method.

A large K$ efflux was always observed during excitations irrespective of whether the cell was intact or tonoplast-free. In tonoplast-free cells, the permeability of the plasma membrane for K$ at the plateau of the prolonged action potential was almost the same as that in the resting state. In many cases, Cl- efflux was also observed during excitations of intact cells although some cells showed action potentials without a detectable increase in Cl- efflux. Almost all tonoplast-free cells generated action potentials with no associated increase in Cl- efflux. These results indicate that some ion other than Cl- carries inward current which balances the outward current carried by K$. Calcium ion is discussed as the most probable candidate.

(Received November 18, 1983; Accepted June 12, 1984)
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