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Plant and Cell Physiology Advance Access originally published online on June 12, 2007
Plant and Cell Physiology 2007 48(7):900-907; 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 email: journals.permissions@oxfordjournals.org

Mini Review

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: E-mail, ueda{at}mail.tains.tohoku.ac.jp; Fax, +81-22-795-6553.


  Abstract

Nyctinastic plants open and close leaves with a circadian rhythm. Here we discuss chemical aspects of the mechanism of nyctinastic leaf movement. Nyctinastic plants from five different genera are known to contain species-specific leaf-opening and leaf-closing factors. The relative concentrations of leaf-closing and leaf-opening factors of the nyctinastic plant Phyllanthus urinaria change circadianly, 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 and 180 kDa that bind to a leaf-opening factor of Cassia mimosoides. The molecular identification of these proteins is underway.

Keywords: Endogenous bioactive substance - Legumes - Motor cell - Nyctinasty - Receptor

Abbreviations: FITC, fluorescein isothiocyanate; SAR, structure–activity relationship.

(Received April 28, 2006; Accepted May 6, 2007)
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