Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 61:150-153 (1978)
© 1978 American Society of Plant Biologists

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Articles

Regulation of the Photosynthesis Rhythm in Euglena gracilis

I. Carbonic Anhydrase and Glyceraldehyde-3-Phosphate Dehydrogenase Do Not Regulate the Photosynthesis Rhythm 1

Thomas A. Lonergan2 and Malcolm L. Sargent3

Department of Genetics and Development, University of Illinois, Urbana, Illinois 61801

A circadian rhythm of O2 evolution has been found in Euglena gracilis, Klebs strain Z. The rhythm persists for at least 5 days in constant dim light and temperature, but damps out in constant bright light. The phase of this rhythm can be shifted by a pulse of bright light and the period length is not changed over a 10 C span of growth temperature.

The O2 evolution rhythm is found in both logarithmic and stationary phase cultures, but CO2 uptake is clearly rhythmic only in stationary phase cultures.

The activity of glyceraldehyde-3-phosphate dehydrogenase was not rhythmic as previously reported (Walther and Edmunds [1973] Plant Physiol. 51: 250-258). Carbonic anhydrase activity was rhythmic when the cultures were maintained under a light-dark cycle with the highest enzyme activity coinciding with the fastest rate of O2 evolution. However, the rhythm in carbonic anhydrase activity disappeared under constant conditions. Changes in the activities of these two enzymes are therefore not responsible for the rhythmic changes in photosynthetic capacity.

2 Present address: Department of Biology, Yale University, Kline Tower, New Haven, Connecticut 06520.

3 Author to whom reprint requests should be addressed.

1 This work was supported by Grant GM 16541 from the National Institute of General Medical Sciences to M. L. S. and a National Institutes of Health Traineeship to T. A. L.






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