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Plant and Cell Physiology, 1986, Vol. 27, No. 4 711-716
© 1986

Article

An Analysis of Osterhout and Hill's Salt Bridge Experiments in Characeae Internode

Takayoshi Tabata1 and Takao Sibaoka2

Biological Institute, Faculty of Science, Tohoku University Sendai 980, Japan

Conduction of action potentials in Chara internodal cells was blocked at a 5%-urethane treated region. The action potentials could be propagated beyond this region when an electric bridge was built across it with a low enough resistance that the action current across it could depolarize the membrane at the distal junction of the bridge up to the threshold level. After recovery of propagation, the configuration of the action current flowing through the bridge changed from monophasic to diphasic. Courses of the monophasic action current and the depolarizing potential of the resting membrane were in parallel with the course of action potential, although they were slightly out of phase with each other. The magnitudes of the current and depolarizing potential agreed well with those estimated using a simplified equivalent circuit of the bridge arrangement or with those observed using an electric model circuit.

1Present address: Department of Physiology, Tohoku University School of Dentistry, Seiryo-machi, Sendai 980, Japan.

2Present address: Biology Laboratory, Kyoritsu Women's University, Hachioji, Tokyo 193, Japan.

(Received December 18, 1985; Accepted March 26, 1986)
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