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Fraction of the actinic light absorbed by the leaf (Abs) and fraction of the absorbed light distributed to photosystem II (dII) after 18 days (a), 25 days (b), and 32 days (c) of lettuce cultivation (n = 6). “8 h:16 h” is 8 h (light):16 h (dark), “16 h:8 h” is 16 h (light):8 h (dark), and “24 h:0 h” is 24 h (light):0 h (dark). *, difference from control plants cultivated under 16 h (light):8 h (dark) were significant (p < 0.05).
