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Light-response curves of PSII quantum yield (ΦPSII) (A) and non-photochemical quenching (NPQ) (B) in the wild-type (WT, in blue) and the dy1 mutant (in red) seedlings. The measurements were taken at photosynthetic active photon flux densities (PPFD) of 3, 19, 43, 145, 300, 387, 611, 1,006, and 1,312 μmol m-2 s-1. Data represent means ± SD (n = 6).
