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Plant and Cell Physiology, 1985, Vol. 26, No. 1 1-13
© 1985

Article

Membrane Potentials in Excitable Cells of Aldrovanda vesiculosa Trap-Lobes

Toshio Iijima1 and Takao Sibaoka2

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

The resting membrane potential in excitable cells of Aldrovanda trap-lobes is composed of diffusion and electrogenic potentials. The diffusion potential, about –100 mV in artificial pond water, was determined from the external K+ and Na+ concentrations. The permeability ratio, PNa/PK of the membrane was estimated to be about 0.3. The electrogenic potential hyperpolarized the membrane to about –140 mV. The peak value of the action potential increased by +26 mV with a tenfold increase in the external Ca2+ concentration. The action potential was blocked by an application of the Ca2+ chelater or the Ca channel blocker, LaCl3. Cells showed additional Ca2+ influx (7.8 pmole/cm2 impulse) during membrane excitation. These facts suggest that the transient increase in Ca2+ influx causes the action potential present in cells of Aldrovanda trap-lobes.

1 Present address: Jerry Lewis Neuromuscular Research Center, School of Medicine, University of California Los Angeles, Los Angeles, CA90024, U.S.A.

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

(Received September 21, 1983; Accepted September 7, 1984)
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