Journal of Plant Biology

, Volume 49, Issue 6, pp 432–439 | Cite as

Variations in total phenolics during ontogenetic, morphogenetic, and diurnal cycles inHypericum species from Turkey

  • Ali Kemal Ayan
  • Cüneyt Çirak
  • Oguzhan Yanar


Several species ofHypericum are used in traditional Turkish folk medicine. Their most medicinally important secondary metabolites are the hypericins, hyperforins, and phenolics. Here, we determined the ontogenetic, morphogenetic, and diurnal variations in total phenolics contents fromH. aviculariifolium subsp.depilatum var.depilatum (endemic),H. perforation, andH. pruinatum. Plants of wild-growingH. aviculariifolium subsp.depilatum var.depilatum andH. perforatum, and greenhouse-grownH. pruinatum were harvested four times per day during their vegetative, floral-budding, full-flowering, fresh-fruiting, and mature-fruiting stages. They were then dissected into stem, leaf, and reproductive tissues to be dried separately and assayed. The highest level of phenolics inH. aviculariifolium subsp.depilatum var.depilatum andH. pruinatum was found in the leaves, whereas the floral buds produced the greatest amount inH. perforatum. Variations in contents from whole plants fluctuated diurnally, differing among species over the course of ontogenesis, reaching the highest level at floral-budding and tending to increase at mid-day inH. aviculariifolium subsp.depilatum var.depilatum. ForH. perforatum andH. pruinatum, contents also were the highest during floral development, although no diurnal fluctuations were observed in those species.


diurnal variation Hypericum spp. ontogenesis phenolics plant defense 


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Copyright information

© The Botanical Society of Korea 2006

Authors and Affiliations

  • Ali Kemal Ayan
    • 1
  • Cüneyt Çirak
    • 2
  • Oguzhan Yanar
    • 3
  1. 1.The High School of Profession of BafraUniversity of Ondokuz MaylsKurupelitTurkey
  2. 2.Faculty of Agriculture, Department of AgronomyUniversity of Ondokuz MaylsKurupelitTurkey
  3. 3.Faculty of Science and Art, Department of BiologyUniversity of Ondokuz MaylsKurupelitTurkey

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