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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, 141419 (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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