[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 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.
Bolychevtseva
Iu V
IuV
Bach Institute of Biochemistry, Russian Academy of Sciences, Leninskii pr. 33, Moscow, 119071 Russia.
Mazhorova
L E
LE
Terekhova
I V
IV
Egorova
E A
EA
Shugaev
A G
AG
Rakhimberdieva
M G
MG
Karapetian
N V
NV
D000222:Adaptation, Physiological; D002245:Carbon Dioxide / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D000458:Cyanobacteria / Q000378:metabolism / Q000502:physiology*; D038181:FMN Reductase / Q000378:metabolism; D008027:Light; D008029:Lighting; D010084:Oxidation-Reduction; D010788:Photosynthesis; D010860:Pigments, Biological / Q000096:biosynthesis
D010860:Pigments, Biological; D002734:Chlorophyll; D002245:Carbon Dioxide; C001785:chlorophyll P 700; D038181:FMN Reductase