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Plant and Cell Physiology Advance Access originally published online on January 19, 2005
Plant and Cell Physiology 2005 46(1):130-135; doi:10.1093/pcp/pci004
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© 2005 Oxford University Press

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

Toshiyuki Kaneko1, Chiyuki Saito2, Teruo Shimmen3 and Munehiro Kikuyama1,2,4

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

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.

4 Corresponding author: E-mail, kikuyama{at}bio.sc.niigata-u.ac.jp; Fax, +81-25-262-6175.

(Received May 24, 2004; Accepted October 22, 2004)


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