RHYTHMIC SETTLING BEHAVIOR IN PYRAMIMONAS PARKEAE(PRASINOPHYCEAE)1

Autor:	Mark E. Aken, Neil J. Griffin Griffin
Rok vydání:	1993
Předmět:	Pyramimonas parkeae biology Ecology Period (gene) Prasinophyceae Circadian clock Plant Science Aquatic Science biology.organism_classification Rhythm Settling Biophysics Circadian rhythm Culture vessel
Zdroj:	Journal of Phycology. 29:9-15
ISSN:	1529-8817 0022-3646
DOI:	10.1111/j.1529-8817.1993.tb00274.x
Popis:	Pyramimonas parkeae Norris et Pearson was examined for evidence of a settling rhythm while growing in laboratory culture. The alga settled rhythmically in a diet cycle when kept in a regularly alternating light-dark cycle. Cells moved out of suspension when settling and attached themselves to the sides and base of the culture vessel. Although rhythmic settling was inhibited in constant dim light (LL), it continued in constant darkness for 4 days with a period of approximately 24 h. The settling rhythm was temperature-compensated and could be reset by 6-h exposures to light. These observations demonstrate that the settling behavior of P. parkeae is controlled by an endogenous circadian oscillator. Regular low temperature pulses every 12 h removed the inhibition caused by LL and this points to the possible role of temperature changes as stimuli entraining the circadian settling rhythm of P. parkeae.
Databáze:	OpenAIRE
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