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Kinetics of time-course induction and relaxation of Y(PSII) before (A) and after (B) 3 h high-light treatment. Forty seconds after initial determination of Fo and Fm, actinic light (531 μmol photons m−2 s−1) was switched on for 715 seconds. After termination of actinic light, relaxation was monitored for 600 seconds. Values are means ±SE (n = 5).
