Light adaptation of Photosystem II is mediated by the plastoquinone pool.
During the first few enzymatic turnovers after dark adaptation of photosystem II (PSII), the relaxation rate of the EPR signals from the Mn cluster and YD(dot) are significantly enhanced. This light-adaptation process has been suggested to involve the appearance of a new paramagnet on the PSII donor side [Peterson, Åhrling, Hogblom, and Styring, Biochemistry 2003, asap]. In the present study, a co
