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Plant Physiology 58:22-27 (1976)
© 1976 American Society of Plant Biologists

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Articles

Circadian Rhythms of Chloroplast Orientation and Photosynthetic Capacity in Ulva1,2,3

Steven J. Britz4,5 and Winslow R. Briggs4

a Department of Biology, Harvard University, Cambridge, Massachusetts 02138

Ulva lactuca L. var. latissima (L.) Decandolle and var. rigida (C. Agardh) Le Jolis and U. mutabilis Foyn have a circadian rhythm of chloroplast orientation which results in large changes in the light-absorption properties of the thallus. During the day, the chloroplasts cover the outer face of the cells and absorbance is high. At night, the chloroplasts are along the side walls and absorbance is low. Enteromorpha linza (L.) J. Agardh, E. intestinalis (L.) Link, E. sp., and Monostroma grevillei (Thuret) Wittrock, members of the Ulvales, were not observed to have this rhythmic movement. Chloroplasts, when in the face position, could not be induced to move to the sides by high intensity light up to 80,000 lux. Unrelated to chloroplast position per se and light-absorption efficiency, there is a rhythm of photosynthetic capacity which peaks just before midday and which continues in constant darkness.

4 Present address: Carnegie Institution of Washington, Department of Plant Biology, Stanford, Calif. 94305.

5 To whom reprint requests should be addressed.

1 This work has been supported by National Institutes of Health Predoctoral Fellowship T01GM00036 and Frederick Sheldon Travelling Fellowship to S. J. B., National Science Foundation Grant No. GB-30964 to W. R. B., the Carnegie Institution of Washington, Department of Plant Biology. Stanford, Calif. 94305, and the Deutsche Forschungsgemeinschaft.

2 This work has been presented in part at the Eighth International Seaweed Symposium, August 1974, Bangor, Wales. Great Britain.

3 CIW-DPB Publication No. 565.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists