RT Journal Article
SR Electronic
T1 Characterization of Photosynthetic Rhythms in Marine Dinoflagellates
JF Plant Physiology
JO Plant Physiol.
FD American Society of Plant Biologists
SP 384
OP 387
DO 10.1104/pp.60.3.384
VO 60
IS 3
A1 Prézelin, Barbara B.
A1 Meeson, Blanche W.
A1 Sweeney, Beatrice M.
YR 1977
UL http://www.plantphysiol.org/content/60/3/384.abstract
AB Circadian rhythms in photosynthesis were defined for the first time in the dinoflagellates Glenodinium sp. (M. Bernard strain) and Ceratium furca Ehrenberg (B. Meeson strain) and compared with that in Gonyaulax polyedra Stein. All three phytoplankton species had photosynthetic rhythms with daily amplitudes ranging from 3 to 5 and maxima displayed about midday. The photosynthetic pigment content and absorption properties of the cells were constant over the circadian cycle. Diurnal periodicities in respiration never accounted for more than 30% of the photosynthetic rhythm and did not persist under constant conditions. There was sufficient similarity between the circadian rhythms of these three dinoflagellates to suggest the mechanism of regulation may be the same for each of them.