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The thermoluminescence and delayed luminescence characteristics of PS II α  and PS II β  centers were investigated in BBY particles and stroma thylakoids, respectively. The BBY particles exhibited a thermoluminescence band at 25 °C (B band) which was associated with the charge recombination of the S 2 Q в  -  redox couple and underwent period-2 oscillation in a sequence of flashes. In the flash-induced decay of delayed luminescence of BBY particles a component with a half-time of 34 s corresponded to the B thermoluminescence band and was also assigned to S 2 O в  -  charge recombination. No corresponding thermoluminescence or delayed luminescence components associated with the secondary acceptor Q в  could be observed in the glow curve or delayed luminescence decay of stroma thylakoids. These observations indicate that unlike PS II α  the PS II β  centers are not associated with the two-electron gate, Q в .

Thermoluminescence and Delayed Luminescence Characterization of Photosystem II α and Photosystem II β Reaction Centers