In collaboration with Scientific Association of Iranian Medicinal Plants

Document Type : Research Paper

Authors

1 Research Center of Medicinal Plants Breeding and Development, Department of Horticultural Science and Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran

2 Department of Horticultural Science and Engineering, University of Maragheh, Maragheh, Iran

3 M.Sc. student, Department of Horticultural Science and Engineering, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran

Abstract

Hypericum sp. is one of the most widely used medicinal plants in the world. Both genetic and environmental factors influence the growth and phytochemical properties of the plant. Therefore, in this study, growth characteristics, essential oil content, total phenol and antioxidant potential were evaluated in different populations of three Hypericum species (H. scabrum (HS), H. asperulum (HA) and H. vermiculare (HV)). The results indicated that only flowering stem height was affected by species and other measured traits were not affected by species and population. But the interaction between species and population was significant on all measured traits. So that the highest flowering stem length (77.7 cm), flower and leaf weight (42.4 g), stem weight (30.9 g), plant weight (65.6 g), essential oil content (0.43%), total phenol (204.9 mg gallic acid.g-1 dry extract) and antioxidant potential (52.7 µg dry extract.ml-1) belonged to populations No.5 in HA, No.3 in HS, No.4 in HA, No.4 in HA, No.4 in HS, No.6 in HV, and No.5 in HA, respectively. A positive and significant correlation was observed between stem weight, flower and leaf weight and plant weight with mean annual rainfall of the habitat, between essential oil percentage with soil phosphorus and mean annual temperature of the habitat, and between the electrical conductivity of the habitat soil with the antioxidant potential of the extract. There was also a negative correlation between essential oil percentage and soil organic matter of the habitat. Stem weight, flower and leaf weight, and plant weight had the highest variance among populations belonging to the same species and, therefore, were identified as desirable traits for separation of populations. Generally, one population cannot be considered superior to the others because the superior population was different depending on the trait. Therefore, to achieve a superior population, all populations of the three species must be cultivated and compared under the same conditions.

Keywords

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