PMID: 1200737Oct 27, 1975Paper

Effect of blue and red light on the synthesis of ribosomal RNA in Chlorella

Archives of Microbiology
M Steup

Abstract

In autotrophic cultures of Chlorella pyrenoidosa (strain 211-8b) incorporation of tritiated guanosine and uridine into ribosomal RNA is stimulated by light. Blue light of wavelengths around 457 nm is considerably more effective than red light around 679 nm (5-10(-10) Einstein cm-2 sec-1 for both). This effect can be demonstrated for young daughter cells (at the end of the dark period) and for older cells (at the end of the light period). It is shown to depend on a regulation of rRNA-synthesis. The blue light dependent enhancement of incorporation is more pronounced in the cytoplasmic rRNA (25 and 18 s) than in the chloroplast rRNA (23 and 16 s). Blue light of low intensity (1-10(-10) Einstein cm-2 sec-1) has nearly the same effectivity as the fivefold intensity, whereas red light of equal quantum fluxes enhances incorporation only slightly compared with the dark control. The blue light dependent enhancement of rRNA-synthesis continues in the following darkness in contrary to that caused by red light. This enhancement is also found in DCMU-poisened cultures. In contrast to this, is red light in presence of DCMU, incorporation into rRNA is nearly the same as in dark. It is concluded that the regulation of rRNA-synthesis in red li...Continue Reading

References

Sep 27, 1974·Biochimica Et Biophysica Acta·M J Miller, D McMahon
May 10, 1972·Biochimica Et Biophysica Acta·R A Cattolico, R F Jones
Jun 1, 1967·Proceedings of the National Academy of Sciences of the United States of America·J M Pickett, C S French
Aug 1, 1969·Proceedings of the National Academy of Sciences of the United States of America·S J Surzycki
Dec 21, 1966·Biochimica Et Biophysica Acta·J H Parish, K S Kirby

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Citations

Jun 1, 1994·Photosynthesis Research·A Pirson
Jan 30, 2015·Bioprocess and Biosystems Engineering·Andreas Christoph Apel, Dirk Weuster-Botz

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