About-weekly changes in electrical potential, chloroplast migration and oxygen production in Acetabularia grown under continuous exposure to light

G. Katinas, D. Hillman, J. Siegelová, J. Dušek, H. Svačinová, Germaine G Cornelissen-Guillaume, F. Halberg

Research output: Contribution to journalReview articlepeer-review

2 Scopus citations

Abstract

The presence of an about-weekly (circaseptan) component was examined in the giant unicellular alga Acetabularia and compared with its circadian rhythms. The analysis was based on the archival data collected by the late Hans-Georg Schweiger of Germany. Changes in electrical potentials, chloroplast migration and oxygen production were investigated and related to whether, during cultivation, this algae was exposed to continuous light (LL) or to an alternation of light and darkness at 12-hour intervals (LD 12:12). In LD 12:12 conditions, the circadian rhythm was a prominent spectral component while, in LL conditions, the circaseptan component increased. The results provide further evidence for the ubiquity of circaseptan rhytms and suggest that this component, appearing early in the course of evolution, has become anchored in the genetic makeup of living organisms.

Original languageEnglish (US)
Pages (from-to)309-314
Number of pages6
JournalScripta Medica Facultatis Medicae Universitatis Brunensis Masarykianae
Volume75
Issue number6
StatePublished - Dec 1 2002

Keywords

  • Acetabularia
  • Chloroplast migration
  • Circaseptan rhythm
  • Electrical potential
  • Oxygen production

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