Abstract
The color of light (white, red, blue, and green) had a significant effect on the growth and reproductive processes (both in the nucleocytoplasmic and chloroplast compartment of the cells) in synchronous cultures ofScenedesmus obliquus. This effect decreased in the order red > white > blue > green. In the same order, the light phase of the cell cycle (time when first autospores started to be released) was prolonged. The length of dark phase (time when 100% of daughters were allowed to release from mothers) was not influenced and was the same for all colors. Critical cell size for cell division in green light was shifted to a smaller size (compared with cells grown in other lights) and so was the size of released daughters. The nuclear cycle was slowed in blue and even in green light, contrary to cells grown in red and white light. At the beginning of the cell cycle, one-nucleus daughters possess ∼ 10 nucleoids; during the cell cycle their number doubled in all variants before the division of nuclei. Both events were delayed in cultures grown more slowly — most markedly in green light. Smaller daughters in the green variant possessed a lower number of nucleoids. Motile cells released in continuous green or blue lights but not in red one were rarely observed.
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Abbreviations
- CDK(s):
-
cyclin-dependent kinase(s)
- DAPI:
-
4,6′-diamidino-2-phenylindole
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The paper was supported by grants provided byGrant Agency of the Czech Republic no. 204/03/1113,Ministry of Education, Youth and Sports of the Czech Republic no. IM 679 859 3901 and institutional research plan no. AV 0Z 6005 0516.
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Cepák, V., Přibyl, P. & Vítová, M. The effect of light color on the nucleocytoplasmic and chloroplast cycle of the green chlorococcal algaScenedesmus obliquus . Folia Microbiol 51, 342–348 (2006). https://doi.org/10.1007/BF02931828
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DOI: https://doi.org/10.1007/BF02931828