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Plant Physiology 58:17-21 (1976)
© 1976 American Society of Plant Biologists

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Articles

Automatic Monitoring of a Circadian Rhythm of Change in Light Transmittance in Ulva1,2

Steven J. Britza,3,4

J. Pfaub and W. Nultschb

Winslow R. Briggsc

a Department of Biology, Harvard University, Cambridge, Massachusetts 02138, b Fachbereich Biologie/Botanik, Philipps-Universität, Marburg, West Germany, Department of Plant Biology, Carnegie Institution of Washington, Stanford, California 94305

Ulva lactuca L. var. latissima (L.) DeCandolle has a circadian rhythm of visible light transmittance change which is caused by chloroplast orientation. With a continuously recording microphotometer system, clear rhythms could be monitored for up to 10 days. Measuring beam intensity effects on the free running period were seen down to 10–7 w cm–2. While these effects complicate the measuring process, they demonstrate that Ulva is very sensitive to light. The free running period in constant darkness at 20 C is 24 to 25 hours. The position in the cell occupied by the chloroplasts when the rhythm damps out can be influenced by light. A method is described by which the times of rhythm maxima can be calculated accurately and objectively from a relatively small number of points.

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

4 To whom reprint requests should be addressed.

1 This work has been supported by National Institutes of Health Predoctoral Fellowship T01GM00036 and a Frederick Sheldon Travelling Fellowship to S. J. B., the Carnegie Institution of Washington, Department of Plant Biology, Stanford, Calif. 94305, and the Deutsche Forschungsgemeinschaft.

2 CIW-DPB Publication No. 566.






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Copyright © 1976 by the American Society of Plant Biologists