Possible involvement of mechanosensitive Ca2+ channels of plasma membrane in mechanoperception in Chara |
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Authors: | Kaneko Toshiyuki Saito Chiyuki Shimmen Teruo Kikuyama Munehiro |
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Institution: | Graduate School of Science and Technology, Niigata University, Niigata, 950-2181 Japan. |
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Abstract: | 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. |
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