Fig. 1.

The electron flow of the photosynthetic process and respiration metabolism in cyanobacteria. The scheme was drawn based on the data described in references 12–21. Filled black arrows mark the respiration metabolism. Unfilled arrows indicate the photosynthetic and additional electron flow processes. Double arrows mark additional steps not shown for clarity. G3P is glyceraldehyde 3 phosphate, and TCA stands for tricarboxylic acid cycle. The membrane soluble plastoquinone (PQ) functions as an acceptor of residual electrons of the glycolysis and the TCA cycle, as well as an essential mediator of the photosynthetic electrons between PSII and the b₆f complex. Dashed lines indicate the site of action of inhibitors of the photosynthetic or respiratory, used in this work