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Plant and Cell Physiology Advance Access originally published online on September 28, 2005
Plant and Cell Physiology 2005 46(11):1863-1871; doi:10.1093/pcp/pci204
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Ionic Mechanism of Mechano-perception in Characeae

Kosei Iwabuchi1, Toshiyuki Kaneko1 and Munehiro Kikuyama1,2,*

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

* Corresponding author: E-mail, kikuyama{at}bio.sc.niigata-u.ac.jp; Fax, +81-025-262-6175.

Characean internodal cells generate receptor potential in response to mechanical stimuli. We studied responses of internodal cells to a long-lasting stimulus and the results were as follows. (i) The cell generated receptor potential at the moment of both compression and decompression. (ii) The receptor potential ({Delta}E m) was significantly larger at the moment of decompression than at compression. (iii) The longer the duration of the stimulus, the larger was the magnitude of {Delta}E m at the moment of decompression. (iv) Aequorin studies revealed that the increase in [Ca2+]c ({Delta}[Ca2+]c) took place at the moment of both compression and decompression. (v) The amplitude of {Delta}[Ca2+]c was larger at the moment of decompression than at compression, as was the case for {Delta}E m. It was suggested that the amplitude of the receptor potential had a tight correlation with the degree of membrane deformation. We discussed the ionic mechanism of mechano-perception under a long-lasting stimulus in relation to mechanosensitive activation of Ca2+ channels at the plasma membrane.

(Received June 15, 2005; Accepted September 15, 2005)
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