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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1429-1438
© 1986

Article

K+ Channel in the Chora Plasmalemma: Estimations of K+ Channel Density and Single K+ Channel Conductance

Taka-aki Ohkawa, Izuo Tsutsui and Uichiro Kishimoto

Department of Biology, College of General Education, Osaka University 1-1 Machikaneyama Toyonaka, Osaka 560, Japan

The electromotive force E and the conductance G of the Chara corallina plasmalemma were measured under voltage clamp conditions. In the depolarized voltage range less negative than –60 mV, E changed according to the Nerhst equation for K+, and G increased with the external K+ concentration [K+]o and also with the depolarization of the membrane potential. This is attributed to the voltage-dependent opening of the K+ channels in the largely depolarized voltage region. The voltage-dependent increase of G was due to the increase of the number of open K+ channels per unit area.

The density of the total K+ channels in the C. corallina plasmalemma was estimated to be about 6.50/(10 µm)2. The single K+ channel conductance {gamma}K changed with the external [K+]o; it was 79.3, 86.1, 105.9, 119.0 pS for external [K+]o of 0.2, 0.5, 2.0 and 5.0 mu respectively.

(Received May 22, 1986; Accepted August 22, 1986)
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