A New Type of Adaptation of the Cyanobacterium Spirulina platensis to Illumination Conditions

Incubation of cells of the cyanobacterium Spirulina platensis under conditions of exposure to low-intensity (2-3 mu E m super(-2) s super(-1)) red light, which was predominantly absorbed by photosystem I (PS I), caused atypical adaptation changes. Invariable pigment composition and stoichiometry of...

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Bibliographic Details
Published in:Applied biochemistry and microbiology 2003-01, Vol.39 (5), p.497-502
Main Authors: Bolychevtseva, Y V, Mazhorova, LE, Terekhova, I V, Egorova, E A, Shugaev, A G, Rakhimberdieva, M G, Karapetyan, N V
Format: Article
Language:English
Subjects:
Cyanophyta
Freshwater
NAD(P)H dehydrogenase
Spirulina platensis
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Summary:Incubation of cells of the cyanobacterium Spirulina platensis under conditions of exposure to low-intensity (2-3 mu E m super(-2) s super(-1)) red light, which was predominantly absorbed by photosystem I (PS I), caused atypical adaptation changes. Invariable pigment composition and stoichiometry of the photosystems was observed in the cells incubated under these conditions against the background of a decrease in the rate of photosynthetic fixation of CO sub(2) (by one-half) and a 1.5-fold increase in the rate of dark respiration relative to cells incubated under conditions of exposure to green light. Comparison of these data with a high rate of dark relaxation of P700 super(+) in the presence of diuron suggests that deficiency of reduced equivalents on the donor side of PS I in Spirulina cells exposed to red light is compensated by electron supply from the respiratory chain NAD(P)H dehydrogenase complex.
ISSN:0003-6838