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Plant and Cell Physiology Advance Access published online on February 10, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj018
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Plant and Cell Physiology 2006 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received December 14, 2005
Accepted January 31, 2006

Short Communication

Electrical Perception of "Death Message" in Chara : Characterization of K+-induced Depolarization

Teruo Shimmen 1 *

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

* To whom correspondence should be addressed.
Teruo Shimmen, E-mail: shimmen{at}sci.u-hyogo.ac.jp


  Abstract

When the nodal end of an internodal cell of Chara corallina was subjected to a pulse treatment with the artificial cell sap, a depolarization lasted in artificial pond water. This depolarization could be also induced by the pulse treatment with KCl solution, indicating that K+ in the artificial cell sap is responsible (K+-induced depolarization). The depolarization was prolonged in the presence of 2 mM KCl and the prolonged depolarization was terminated by supplementing either CaCl2, MgCl2 or NaCl. These results supported the hypothesis that K+ released from the killed cell is responsible for generation of the wound-induced membrane depolarization.

Keywords: Chara; Depolarization; Membrane potential; K+; Wounding response.
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T. Shimmen
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