Abstract
The division cycle of two phytoplankton species, Olisthodiscus luteus and Heterocapsa sp. was studied in relation to a 12:12 light:dark cycle. Batch cultures in exponential phase were sampled every three hours during 48 hours. Cell number, cellular volume and DNA and RNA concentrations were measured. Microscopic observations of the nuclei of Heterocapsa sp. were also performed. In both species, cell division took place in the dark. In Heterocapsa sp., DNA and RNA showed a similar diel variability pattern, with synthesis starting at the end of the light period, previously to mitosis and cytokinesis. In O. luteus. Major RNA synthesis occurred during darkness, and DNA was produced almost continuously. Both species presented different values and diel rhythmicity on the RNA/DNA ratios.
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Berdalet, E., Latasa, M., Estrada, M. (1992). Variations in biochemical parameters of Heterocapsa sp. and Olisthodiscus luteus grown in 12:12 light:dark cycles. In: Berman, T., Gons, H.J., Mur, L.R. (eds) The Daily Growth Cycle of Phytoplankton. Developments in Hydrobiology, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2805-6_12
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DOI: https://doi.org/10.1007/978-94-011-2805-6_12
Publisher Name: Springer, Dordrecht
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