Autor: Karapetian Nv, Bolychevtseva IuV, Mazhorova Le, Rakhimberdieva Mg, Shugaev Ag, Terekhova, Egorova Ea
Rok vydání: 2003
Předmět:
Zdroj: Applied Biochemistry and Microbiology. 39:503-508
ISSN: 0003-6838
Popis: 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.
Databáze: OpenAIRE
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