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Plant and Cell Physiology Advance Access originally published online on February 18, 2006
Plant and Cell Physiology 2006 47(4):531-539; doi:10.1093/pcp/pcj022
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Change in the Actin Cytoskeleton during Seismonastic Movement of Mimosa pudica

Nobuyuki Kanzawa1,*, Yoshinori Hoshino1, Makiko Chiba1, Daisuke Hoshino1, Hidetaka Kobayashi1, Naomi Kamasawa2, Yoshiro Kishi3, Masako Osumi2, Masazumi Sameshima4 and Takahide Tsuchiya1

1 Department of Chemistry, Faculty of Science and Technology, Sophia University, Tokyo, 102-8554 Japan
2 Department of Chemical and Biological Sciences, Faculty of Science, Japan Women’s University, Tokyo, 112-8681 Japan
3 Department of Cell Biology, Tokyo Metropolitan Institute of Medical Science, Tokyo Metropolitan Organization for Medical Research, Tokyo, 113-8613 Japan
4 Department of Biofunctional Science, Faculty of Agriculture and Life Science, Hirosaki University, Aomori, 036-8561 Japan

* Corresponding author: E-mail, n-kanza{at}sophia.ac.jp; Fax, +81-3-3238-3361.

The seismonastic movement of Mimosa pudica is triggered by a sudden loss of turgor pressure. In the present study, we compared the cell cytoskeleton by immunofluorescence analysis before and after movement, and the effects of actin- and microtubule-targeted drugs were examined by injecting them into the cut pulvinus. We found that fragmentation of actin filaments and microtubules occurs during bending, although the actin cytoskeleton, but not the microtubules, was involved in regulation of the movement. Transmission electron microscopy revealed that actin cables became loose after the bending. We injected phosphatase inhibitors into the severed pulvinus to examine the effects of such inhibitors on the actin cytoskeleton. We found that changes in actin isoforms, fragmentation of actin filaments and the bending movement were all inhibited after injection of a tyrosine phosphatase inhibitor. We thus propose that the phosphorylation status of actin at tyrosine residues affects the dynamic reorganization of actin filaments and causes seismonastic movement.

(Received July 22, 2005; Accepted February 15, 2006)
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