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  • Title: [A new type of adaptation of the cyanobacterium Spirulina platensis to illumination conditions].
    Author: Bolychevtseva IuV, Mazhorova LE, Terekhova IV, Egorova EA, Shugaev AG, Rakhimberdieva MG, Karapetian NV.
    Journal: Prikl Biokhim Mikrobiol; 2003; 39(5):571-6. PubMed ID: 14593872.
    Abstract:
    Incubation of cells of the cyanobacterium Spirulina platensis under conditions of exposure to low-intensity (2-3 microE m-2 s-1) red light, which was predominantly absorbed by photosystem I (PS I), caused atypical adaptation changes. Invariable pigment composition and stoichiometry of photosystems was observed in the cells incubated under these conditions against the background of a decrease in the rate of photosynthetic fixation of CO2 (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+ in the presence of diuron suggests that deficiency of reduced equivalents at the donor side of PS I in the Spirulina cells exposed to red light is compensated by electron supply from the respiratory chain NAD(P)H dehydrogenase complex.
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