A prolonged (20–24 h) dark incubation of Chlorella pyrenoidosa algae at 37–38°С did not diminish the relative yield of the variable chlorophyll fluorescence (F v/F m) and enhanced the relative contribution of the slow phase (sF v) to the kinetics of F v increase. Iodoacetamide, a nonmetabolized glucose analog, 2-deoxyglucose (2-DG), an inhibitor of protein synthesis, cycloheximide, and a decrease in the temperature of dark incubation to 18–20°С prevented this sF v increase. Both the illumination of dark-incubated cells and the addition of 2-DG in darkness restored the initial level of sF v. In the light-grown chlorella cells, the relative contribution of sF v reversibly declined with lowering light intensity and increased when СО2 was excluded from the bubbling mixture. The authors presume that the slow phase in the kinetics of F v increase is related to the functioning of the fraction of the photosystem II complexes with a destabilized primary quinone acceptor of electron, and the content of these complexes in the cell depends on the plastoquinone redox state.
Russian Journal of Plant Physiology – Springer Journals
Published: Oct 18, 2004
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