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Pure Appl. Chem. 75(2-3), 353-358, 2003

Pure and Applied Chemistry

Vol. 75, Issue 2-3

Chemical studies on plant leaf movement controlled by a biological clock

M. Ueda, T. Sugimoto, Y. Sawai, T. Ohnuki, and S. Yamamura

Laboratory of Natural Products, Department of Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi, Yokohama 223-8522, Japan

Abstract: Most leguminous plants close their leaves in the evening, as if to sleep, and open them early in the morning according to the circadian rhythm controlled by a biological clock. Extensive studies on nyctinastic plants led to the isolation of a variety of leaf-closing and -opening substances. And we found that the biological clock regulates the balance of concentration between leaf-opening and -closing substances in the plant body during the day.

*Pure Appl.Chem. 75, 141�419 (2003). An issue of reviews and research papers based on lectures presented at the 23rd IUPAC International Symposium on the Chemistry of Natural Products, Florence, Italy, 28 July � 2 August 2002.


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