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Changes of xanthophyll-cycle pigments in P. tricornutum during the first 45 min of incubation with HL2 (1,000 μmol m−2⋅s−1). (A) Control without additives; (B) addition of norflurazon (5 μM) or (C) addition of DTT (500 μM) before HL2 incubation. The concentration of β-carotene increased slightly during 45-min HL in the control, remained unchanged when DTT was present, and fell slightly with norflurazon present (not shown).
