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The Journal of General Physiology, Vol 45, 69-76, Copyright © 1961 by The Rockefeller University Press

ARTICLE

A Persistent Daily Rhythm in Photosynthesis

J. Woodland Hastings 1, Lazarus Astrachan 1, and Beatrice M. Sweeney 1

1 From the Division of Biochemistry, University of Illinois, Urbana, the Biology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, and the Scripps Institution of Oceanography, La Jolla, California

The luminescent marine dinoflagellate, Gonyaulax polyedra, exhibits a diurnal rhythm in the rate of photosynthesis and photosynthetic capacity measured by incorporation of C14O2, at different times of day. With cultures grown on alternating light and dark periods of 12 hours each, the maximum rate is at the 8th hour of the light period. Cultures transferred from day-night conditions to continuous dim light continue to show the rhythm of photosynthetic capacity (activity measured in bright light) but not of photosynthesis (activity measured in existing dim light). Cultures transferred to continuous bright light, however, do not show any rhythm. Several other properties of the photosynthetic rhythm are similar to those of previously reported rhythms of luminescence and cell division. This similarity suggests that a single mechanism regulates the various rhythms.

Submitted on March 13, 1961


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