Journal Article

Electrophysiological Characterization of the Node in <i>Chara corallina</i>: Functional Differentiation for Wounding Response

Teruo Shimmen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 49, issue 2, pages 264-272
Published in print February 2008 | ISSN: 0032-0781
Published online February 2008 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcn002
Electrophysiological Characterization of the Node in Chara corallina: Functional Differentiation for Wounding Response

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  • Molecular and Cell Biology
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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

Journal Article.  6519 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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