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Plant and Cell Physiology Advance Access originally published online on January 8, 2008
Plant and Cell Physiology 2008 49(2):264-272; doi:10.1093/pcp/pcn002
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Electrophysiological Characterization of the Node in Chara corallina: Functional Differentiation for Wounding Response

Teruo Shimmen*

Department of Life Science, Graduate School of Life Science, University of Hyogo, Harima Science Park City, Hyogo, 678-1297 Japan

*Corresponding author: E-mail, shimmen{at}sci.u-hyogo.ac.jp; Fax, +81-791-58-0175.


  Abstract

Electrical characteristics of the node were analyzed in comparison with those of the flank of the internodal cell in Chara corallina. The dependence of the membrane potential of the node on pH and K+ concentration was almost the same as that of the flank. In the flank, the increase in the Ca2+ concentration stopped the depolarization in the presence of 100 mM KCl. In the node, however, Ca2+ could not stop the depolarization induced by 100 mM KCl. It has been reported that the node has a function to tranduce the signal of osmotic shock into a transient depolarization. In combination with osmotic shock, 10 mM K+ could induce a long-lasting depolarization of the node. These electrical characteristics of the node were suggested to be responsible for the electrical response to wounding in Characeae.

Keywords: Chara - Depolarization - K+ channel - Membrane potential - Proton pump - Wounding response

Abbreviations: A-9-C, anthracene-9-carboxylic acid; APW, artificial pond water; Em, membrane potential; DMSO, dimethylsulfoxide; NPPB, 5-nitro-2-(3-phenylpropylamino)-benzoic acid; TEA, tetraethylammonium.

(Received November 10, 2007; Accepted December 30, 2007)
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