Journal Article

Possible Involvement of Mechanosensitive Ca<sup>2+</sup> Channels of Plasma Membrane in Mechanoperception in <i>Chara</i>

Toshiyuki Kaneko, Chiyuki Saito, Teruo Shimmen and Munehiro Kikuyama

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 46, issue 1, pages 130-135
Published in print January 2005 | ISSN: 0032-0781
Published online January 2005 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pci004
Possible Involvement of Mechanosensitive Ca2+ Channels of Plasma Membrane in Mechanoperception in Chara

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When an internodal cell of Chara corallina was stimulated with a mechanical pulse of various amplitudes lasting for 0.1 s (mechanical stimulus), the cell generated a receptor potential, which was highly dependent not only on the strength of the stimulus but also on the extracellular Cl concentration. Extracellular Ca2+ was indispensable for generating receptor potential, since removal of Ca2+ reversibly inhibited generation of the receptor potential. The cytoplasmic Ca2+ level transiently rose upon mechanical stimulation. The stronger the mechanical stimulus, the larger was the increase in the cytoplasmic level of Ca2+. It is proposed that the first step of receptor potential is an activation of mechanosensitive Ca2+ channels at the plasma membrane.

Keywords: Keywords: Ca2+ — Chara — Mechanical stimulus — Mechanosensitive Ca2+ channel — Receptor potential.; Abbreviations: APW, artificial pond water; [Ca2+]c, cytoplasmic level of Ca2+; Δ[Ca2+]c, increase in [Ca2+]c; PM, photomultiplier.

Journal Article.  4286 words.  Illustrated.

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

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