Journal Article

Electrical Perception of the ‘Death Message’ in <i>Chara</i>: Characterization of K<sup>+</sup>-induced Depolarization

Teruo Shimmen

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 47, issue 4, pages 559-562
Published in print April 2006 | ISSN: 0032-0781
Published online April 2006 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcj018
Electrical Perception of the ‘Death Message’ in Chara: Characterization of K+-induced Depolarization

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When the nodal end of an internodal cell of Chara corallina was subjected to a pulse treatment with artificial cell sap, a depolarization lasted in artificial pond water. This depolarization could also be induced by 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 with 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; K+; Membrane potential; Wounding response; ACS, artificial cell sap; APW, artificial pond water; BSA, bovine serum albumin

Journal Article.  2112 words.  Illustrated.

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

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