Abstract
This work is a theoretical consideration of steady-state kinetics of prompt and delayed fluorescence of chlorophyll a entering into the pigment matrices of photosynthetic units of photosystem II when the electron transport from the primary to secondary acceptor of this system is blocked. It has been shown that in such a system of quantum yields of prompt and delayed fluorescence are complementary. At low intensities of excitation light the quantum yield of delayed fluorescence is several times more than that of prompt fluorescence. With an increase in the light intensity the reverse situation is observed. The literature data given sustain the results obtained. it has also been unambiguously shown what values, when changed, may be responsible for the corresponding changes in prompt and delayed fluorescence yields.
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