In collaboration with Scientific Association of Iranian Medicinal Plants

Document Type : Research Paper

Authors

Research Institute of Forests and Rangelands, Tehran, Iran

Abstract

In this research, the effects of different irrigation treatments on chemical constituents and antibacterial effects of theessential oil of P. argentatum were studied. The experimental design was ran­domized complete block design with four replications. Four irrigation treatments were determined, consisting of: (a) control, which was irrigated to full field capacity (FC); (b) low water stress treatment (LS1=75% of FC); (c) moderate water stress treatment (LS2=50% of FC); (d) sever water stress (HS=25% of FC). Then the volatile constituents of the flowers were isolated and their quantities, qualities and antibacterial effect determined against four gram negative and four gram positive bacteria on the basis of disc-diffusion method. The result showed that not only the quantity of the essential oils but also the qualities varied. The percentage of α-pinene, β-pinene, γ-eudesmol and β-eudesmol has changed. The LS2 treatment of essential oils showed more antimicrobial activity against both gram positive and gram negative bacteria compared to other essential oils. This higher activity of essential oil may be related to higher amount of α-pinene and β-pinene in LS2. In addition gram positive bacteria were more susceptible than gram negative bacteria.

Keywords

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