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Science 27 March 1970:
Vol. 167. no. 3926, pp. 1730 - 1733
DOI: 10.1126/science.167.3926.1730
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Articles

Persisting Circadian Rhythm of Cell Division in a Photosynthetic Mutant of Euglena

Robert M. Jarrett 1 and Leland N. Edmunds Jr. 1

1 Department of Biological Sciences, State University of New York, Stony Brook 11790

A persisting, free-running, circadian rhythm of cell division in a heterotrophically grown mutant of Euglena gracilis var. bacillaris having impaired photosynthesis is obtained upon placing a culture that has been previously synchronized by a 10,14 light-dark cycle into continuous darkness at 19°C (but not at 25°C). A similar persisting rhythm is initiated in exponentially increasing cultures (growing in darkness at 19°C) by a single "switch-up" in irradiance to continuous bright illumination. The results implicate an endogenous biological clock which "gates" the specific event of cell division in the cell developmental cycle.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Clocked cell cycle clocks.
L. Edmunds Jr and K. Adams (1981)
Science 211, 1002-1013
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