Chromatic regulation in Chlamydomonas reinhardtii: Time course of photosystem stoichiometry adjustment following a shift in growth light quality

Photosystem stoichiometry adjustments in Chlamydomonas reinhardtii were induced upon a sudden shift in the light quality during cell growth. Reversible changes in the PSI/PSII ratio were a compensation response to changes in the balance of light absorption by the two photosystems. Quantitations of P...

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Bibliographic Details
Published in:Plant and cell physiology 1997-02, Vol.38 (2), p.188-193
Main Authors: Murakami, A. (National Inst. for Basic Biology, Okazaki, Aichi (Japan)), Fujita, Y, Nemson, J.A, Melis, A
Format: Article
Language:English
Subjects:
BESOIN EN LUMIERE
Biological and medical sciences
Chlamydomonas
CHLAMYDOMONAS REINHARDTII
Chromatic acclimation
CHROMATIN
CHROMATINE
CROMATINA
FOTOSISTEMAS
Fundamental and applied biological sciences. Psychology
LIGHT REQUIREMENTS
MEASUREMENT
MEDICION
MESURE
Metabolism
NECESIDADES DE LUZ
Photosynthesis
Photosynthesis, respiration. Anabolism, catabolism
Photosystem stoichiometry
PHOTOSYSTEME
PHOTOSYSTEMS
Plant physiology and development
REGLAMENTACIONES
REGLEMENTATION
REGULATIONS
Thylakoid membrane
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Summary:Photosystem stoichiometry adjustments in Chlamydomonas reinhardtii were induced upon a sudden shift in the light quality during cell growth. Reversible changes in the PSI/PSII ratio were a compensation response to changes in the balance of light absorption by the two photosystems. Quantitations of PSII, Cyt b6-f complex and PSI revealed a constancy in the cellular content of PSII and the Cyt b6-f complex, and variable amounts of PSI in C. reinhardtii. These results strengthen the notion that PSI is the thylakoid component subject to chromatic regulation and responsible for the adjustment and optimization of the PSI/PSII ratio in the thylakoid of oxygenic photosynthesis. Additional results, obtained upon the use of protein biosynthesis translation inhibitors, suggested that a chromatically-induced lowering of the PSI/PSII ratio in C. reinhardtii occurs by suppression of de novo biosynthesis of PSI components and, therefore, by dilution of the PSI complex in the thylakoid membrane, rather than by active degradation of assembled PSI in chloroplasts
ISSN:0032-0781
1471-9053
DOI:10.1093/oxfordjournals.pcp.a029151