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

ABSTRACT:

Background

Melatonin acts as a signaling hormone and entraining agent in many organisms. We studied the spatiotemporal regulation and influence of light (photoperiods, intensities, and spectral qualities) on melatonin concentration in the medicinal herb Hypericum perforatum L. Furthermore, melatonin concentrations in the leaves of eight species of the Hypericum genus were compared and analyzed using high-performance liquid chromatography.

Results

Melatonin concentration was found to be the highest in its flowers and leaves. The leaves exhibited a rhythmic variation in melatonin concentration of approximately 24 h under both light-dark entrained (Zeitgeber time) and constant light [circadian time (CT)] conditions, with melatonin concentration peaking at approximately CT6 in t

SUBMITTER: Chung MH 

PROVIDER: S-EPMC7492311 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature