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Fig. 3 | Botanical Studies

Fig. 3

From: Effects of circadian clock and light on melatonin concentration in Hypericum perforatum L. (St. John’s Wort)

Fig. 3

Rhythmic changes in melatonin concentrations in H. perforatum L. leaves with time under 18-h light:6-h dark photoperiodic cycles (Zeitgeber time, ZT; solid diamonds) and constant light conditions (circadian time, CT; solid squares). The white bar at the top indicates the light period. The black-shaded bar at the top indicates the dark period and the subjective night. Data are the mean of three replicates

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