Plant Physiology 97:1122-1129 (1991)
© 1991 American Society of Plant Biologists
Environmental and Stress Physiology
Action Spectrum for Resetting the Circadian Phototaxis Rhythm in the CW15 Strain of Chlamydomonas 1
II. Illuminated Cells
Carl Hirschie Johnson,
Takao Kondo and
John Woodland Hastings
Department of Biology, Vanderbilt University, Nashville, Tennessee 37235,
National Institute for Basic Biology, Myodaiji, Okazaki 444, Japan,
The Biological Laboratories, Harvard University, Cambridge, Massachusetts 02138
The action spectrum for resetting the phase of the circadian clock in Chlamydomonas reinhardtii is different depending upon whether the light stimuli are presented to cells that were in darkness versus dim illumination before stimulation. In this report, we show that phase resetting of illuminated cells appears to be mediated by components of the photosynthetic apparatus. This conclusion is based upon the action spectrum for phase-shifting illuminated cells (which looks like that for photosynthesis) and upon the fact that inhibitors of photosynthetic electron transport also inhibit the light-induced phase shift of illuminated cells. Both of these characteristics differ from that of cells taken from darkness. We, therefore, believe that at least two resetting pathways for this circadian clock exist and that both of these pathways are ecologically significant.
1 Part of this study was carried out under the Cooperative Research Program for the use of the Okazaki Large Spectrograph (project Nos. 86-529, 87-524, and 87-530) of the National Institute for Basic Biology, Okazaki, Japan. C. H. Johnson and J. W. Hastings gratefully acknowledge support from the Jean and Katsuma Dan Fellowship and National Science (USA) and Yamada (Japan) Foundations, respectively, which made these collaborations possible. This research was supported by grants from the National Institute of Mental Health to C. H. J. (MH 43836) and to J. W. H. (MH 40755).
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