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Plant and Cell Physiology Advance Access published online on June 12, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm060
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Chemical basis of plant leaf movement

Minoru Ueda and Yoko Nakamura

Department of Chemistry, Tohoku University, Aramakiaza-Aoba 6-3, Aoba-ku, Sendai 980-8578, Japan.

Corresponding author: Minoru Ueda. Department of Chemistry, Tohoku University, Aramakiaza-Aoba 6-3, Aoba-ku, Sendai 980-8578, Japan. Tel: 022-795-6553 & FAX: 022-795-6553, E-mail: ueda{at}mail.tains.tohoku.ac.jp


  Abstract

Nyctinastic plants open and close leaves circadianly. Here we discuss the mechanism of nyctinastic leaf movement from chemical aspects. Nyctinastic plants from five different genera are known to contain species-specific leaf-opening and –closing factors. The relative concentrations between leaf closing and opening factors of a nyctinastic plant Phyllanthus urinaria circadianly change, suggesting that nyctinastic movement is regulated by two classes of circadianly-regulated factors with opposing functions. A closing and an opening factor of Albizzia, when linked to a fluorescent dye, both specifically labeled motor cells of pluvini. A membrane fraction of pluvini contains proteins of 210 kDa and 180kDa that bind to a leaf-opening factor of Cassia mimosoides. Efforts to identify molecular identification of those proteins are underway.

Keywords: legumes - nyctinasty - endogenous bioactive substance - motor cell - receptor


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