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Plant and Cell Physiology, 1978, Vol. 19, No. 2 197-202
© 1978

Article

Circadian rhythm in photosynthesis of the green alga Bryopsis maxima

Mitsumasa Okada, Masashi Inoue and Tadao Ikeda1

Department of Biology, Faculty of Science, Toho University Miyama, Funabashi, Chiba 274, Japan

The green marine alga Bryopsis maxima showed a circadian rhythm in the rate of oxygen evolution in photosynthesis. The rhythm lasted several days in constant light and seemed to be endogenous. It disappeared during darkness and reappeared under natural or artificial light-dark cycle, which shows that it is light-dependent and entrainable by an exogenous light-dark cycle. In the rhythm, the oxygen evolution rate at midnight was 50 to 70% of that at noon, and the amplitude of the rhythm was larger at higher intensities of actinic light. The light-intensity dependency of the rhythm showed that the rhythmic change in the activities was due to an alteration of the dark-reaction rate in photosynthesis and not due to a change of the light-reaction rate.

1 Present address: Radioisotope Research Institution for Basic Medicine, St. Marianna University School of Medicine, 2095 Sugao, Takatsu, Kawasaki 213, Japan.

(Received June 29, 1977; )
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