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Plant and Cell Physiology Advance Access published online on January 19, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci004
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Plant and Cell Physiology 2004 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received May 24, 2004
Accepted October 22, 2004

Regular Paper

Possible Involvement of Mechanosensitive Ca2+ Channels of Plamsma Membrane in Mechanoperception in Chara

Toshiyuki Kaneko 1, Chiyuki Saito 2, Teruo Shimmen 3, and Munehiro Kikuyama 4*

1 Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
2 Department of Biology, Faculty of Science, Niigata University, Niigata 950-2181, Japan
3 Department of Life Science, Graduate School of Life Science, University of Hyogo, Harima Science Park City, Hyogo 678-1297, Japan
4 Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan; Department of Biology, Faculty of Science, Niigata University, Niigata 950-2181, Japan


  Abstract

When an internodal cell of Chara corallina was stimulated with a mechanical pulse of various amplitude 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 extracellular Cl- concentration. Extracellular Ca2+ was indispensable for generating receptor potential, since removal of Ca2+ reversibly inhibited generation of the receptor potential. Cytoplasmic Ca2+ level transiently rose upon mechanical stimulation. The stronger the mechanical stimulus was, the larger the increase in cytoplasmic level of Ca2+ was. It was discussed that the first step of receptor potential is an activation of mechanosensitive Ca2+ channels at the plasma membrane.

Keywords: Ca2+; Chara; mechanical stimulus; mechanosensitive Ca2+ channel; receptor potential.
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