Abstract
The cells of the blue-green alga Synechococcus RF-1 stop multiplying and their physiological condition is maintained in a “suspended state” when a continuous-light-grown culture is incubated under continuous darkness. The nitrogenase activity of Synechococcus RF-1 could not be detected while the cells were in the “suspended state”. The circadian nitrogenase activity rhythm could, however, be induced in a 28° C culture by a raised (12 h 28° C/12h 35° C) or a lowered (12 h 28° C/12h 20° C) temperature regimen while the culture was in the “suspended state”. The results indicate that cell division and/or cell growth is not essential for induction of the circadian rhythm in Synechococcus RF-1.
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Abbreviations
- DD:
-
continuous darkness
- LL:
-
continuous light
- NA:
-
nitrogenase activity
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This work was funded by the Academia Sinica and the National Science Council of the Republic of China. We wish to express our sincere thanks to Dr. N. Grobbelaar, University of Pretoria, for his critical reading of the manuscript.
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Huang, TC., Pen, SY. Induction of a circadian rhythm in Synechococcus RF-1 while the cells are in a “suspended state”. Planta 194, 436–438 (1994). https://doi.org/10.1007/BF00197545
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DOI: https://doi.org/10.1007/BF00197545