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Plant Physiology 63:324-327 (1979)
© 1979 American Society of Plant Biologists

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Articles

Shifting the Phase of the Circadian Rhythm in Bioluminescence in Gonyaulax with Vanillic Acid 1

Richard S. Kiessig, Jeffrey M. Herz and Beatrice M. Sweeney

a Department of Biological Sciences and College of Creative Studies, University of California, Santa Barbara, California 93106

Exposure for 4 hours to vanillic acid (4-hydroxy 3-methoxy benzoic acid) caused large delay phase shifts (5 to 6 hours) in the circadian rhythm of bioluminescence in Gonyaulax polyedra, when assayed at either 10 to 14 circadian time or 22 to 02 circadian time in constant light and temperature, provided that the pH of the medium was 7.1 or lower. Corresponding changes in the pH with acetic acid did not shift phase. Vanillic acid caused detectable depolarization of the membranes of Gonyaulax, as demonstrated with the cyanine dye fluorescence technique.

1 This research was supported in part by President's Undergraduate Fellowships to R. K. and J. H. and in part by National Science Foundation Grant BMS72-02221 to B. S.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1979 by the American Society of Plant Biologists