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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1461-1468
© 1986

Article

Tonoplast Action Potential of Characeae

Munehiro Kikuyama

Faculty of Pharmacology, Niigata College of Pharmacy Kamishin-ei-cho, Niigata 950-21, Japan

The plasmalemma action potential was found to be indispensable to the production of the tonoplast action potential. In a solution lacking Ca2+ and containing other divalent cations such as Ba2+, Mg2+ or Mn2+, the plasmalemma excited in Nitella but did not in Chara. In Nitella, however, both the tonoplast action potential and EC-coupling were abolished due to depletion of Ca2+ from the external medium. Ca2+ ions injected into the cytoplasmic layer caused a transient change in both plasmalemma and tonoplast potentials. These results suggest that a transient rise in Ca2+ concentration during excitation of the plasmalemma may trigger the tonoplast action potential.

(Received February 14, 1986; Accepted August 29, 1986)
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