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Light dependence of steady-state Chl fluorescence parameters of wild-type and pifi mutant leaves. Plants were grown with 50 μmol photon m−2 s−1 light and preilluminated for 4 to 5 h before measurement. Gross NPQ, quantum efficiency of PSII photochemistry (ΦPSII), and reduction state of QA (1 − qL) were measured on attached leaves under various AL intensities.
