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Plant and Cell Physiology Advance Access published online on September 28, 2005
Plant and Cell Physiology, doi:10.1093/pcp/pci204
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Plant and Cell Physiology 2005 © The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received June 15, 2005
Accepted September 15, 2005

Regular Paper

Ionic Mechanism of Mechano-Perception in Characeae

Kosei Iwabuchi 1, Toshiyuki Kaneko 1, and Munehiro Kikuyama 2*

1 Graduate School of Science and Technology, Niigata University, Niigata, 950-2181 Japan
2 Graduate School of Science and Technology, Niigata University, Niigata, 950-2181 Japan; Faculty of Science, Niigata University, Niigata, 950-2181 Japan

* To whom correspondence should be addressed.
Munehiro Kikuyama, E-mail: kikuyama{at}bio.sc.niigata-u.ac.jp


  Abstract

Characean internodal cells generate receptor potential in response to mechanical stimuli. We studied responses of internodal cells upon long-lasting stimulus and the results were as follows.

(1) The cell generated receptor potential at both moments of compression and decompression.

(2) The receptor potential ({Delta}Em) was significantly larger at the moment of decompression than at the compression.

(3) The longer the duration of stimulus, the larger the magnitude of {Delta}Em at the moment of decompression was.

(4) Aequorin studies revealed that the increase in [Ca2+]c ({Delta}[Ca2+]c) took place at both moments.

(5) The amplitude of {Delta}[Ca2+]c was larger at the moment of decompression than at the compression, as well as the case in {Delta}Em.

It was suggested that the amplitude of the receptor potential had tight correlation with degree of membrane deformation. We discussed the ionic mechanism of mechano-perception under long-lasting stimulus in relation to mechanosensitive activation of Ca2+ channels at the plasma membrane.

Keywords: Ca2+; Characeae; mechanosensitive ion channel; membrane deformation; membrane potential; receptor potential.
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