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1 results

  • Variety of cell cycle patterns in the alga Scenedesmus quadricauda (Chlorophyta) as revealed by application of illumination regimes and inhibitors

  • VILÉM ZACHLEDER, KATEŘINA BIšOVÁ, MILADA VÍTOVÁ, šTĚPÁN KUBÍN, JANA HENDRYCHOVÁ
  • Journal:
    European Journal of Phycology / Volume 37 / Issue 3 / August 2002
    Published online by Cambridge University Press:
    10 October 2002, pp. 361-371
    Print publication:
    August 2002

  • In the course of the cell cycles of synchronous cultures of the chlorococcal alga Scenedesmus quadricauda, the following were monitored: total protein and RNA accumulation as a measure of growth processes, the timing of the commitment points at which the cells trigger the sequence of reproductive processes (DNA replication, nuclear and cellular division) and the course of the reproductive processes. The synchronous cultures were grown either under various lighting regimes, or in the temporary presence of specific inhibitors of either proteosynthesis (cycloheximide) or DNA replication (5-fluorodeoxyuridine). By adjusting the length of the light period, the cell cycle could be manipulated. Cell cycle patterns could be altered to give different numbers of sequences of reproductive processes. The extent of their mutual overlap could be influenced and the number of daughter cells produced could be altered. Schematic illustrations of various cell cycle patterns and comparisons with those of higher plants and other algal species are presented.