| Interaction of the Circadian Cycle with the Cell Cycle in Pyrocystis fusiformis. | |
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MedLine Citation:
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PMID: 16662459 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Dividing pairs or single cells of the large dinoflagellate, Pyrocystis fusiformis Murray, were isolated in capillary tubes and their morphology was observed over a number of days, either in a light-dark cycle or in constant darkness. Morphological stages were correlated with the first growth stage, G(1), DNA synthesis, S, the second growth stage, G(2), mitosis, M, and cytokinesis, C, segments of the cell division cycle. The S phase was identified by measuring the nuclear DNA content of cells of different morphologies by the fluorescence of 4', 6-diamidino-2-phenylindole dichloride.Cells changed from one morphological stage to the next only during the night phase of the circadian cycle, both under light-dark conditions and in continuous darkness. Cells in all segments of the cell division cycle displayed a circadian rhythm in bioluminescence. These findings are incompatible with a mechanism for circadian oscillations that invokes cycling in G(q), an hypothesized side loop from G(1). All morphological stages, not only division, appear to be phased by the circadian clock. |
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Authors:
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B M Sweeney |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Plant physiology Volume: 70 ISSN: 0032-0889 ISO Abbreviation: Plant Physiol. Publication Date: 1982 Jul |
Date Detail:
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Created Date: 2010-06-29 Completed Date: 2010-06-29 Revised Date: 2010-09-14 |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 272-6 Citation Subset: - |
Affiliation:
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Department of Biological Sciences, University of California, Santa Barbara, California 93106. |
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