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Relative total content of chlorophylls per leaf area after 18 days (a), 25 days (b), and 32 days (c) 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).
