Investigationn of geographical location effect on yield and chemical composition of Teucrium stocksianum Boiss. essential oils collected from 4 different regions of Hormozgan province

The aim of this study was to investigate the effect of habitat on the quantity and quality of essential oil of Teucrium stocksianum Boiss. Accordingly, the branch of this species at the time of flowering (August 2017 and 2018) were collected from 4 regions of Hormozgan province (northern side of Tang Zagh mountain at 1100 meters of altitude; Abmah mountain at 850 meters of altitude; Tang Zagh mountain at 1400 m and Enveh mountain at 2000 m) . Essential oils were extracted by hydrodistillation method ( Clevenger apparatus) and were analyzed by using GC and GC/MS. The results showed that with decreasing altitude, the amount of essential oil reduced, so that the lowest and highest amounts of essential oil belonged to the samples of Abmah mountain at 850 m and Enveh mountain at 2000 m, respectively. Chemical analysis of T. stocksianum essential oils showed that the common compounds in the essential oils of this species were elmol (2.4 to 8.5%), caryophylene oxide (3.0 to 7.1%) and β-eudsmol (2.2 to 12.1%). Compounds such as α-pinene and myrcene, the most volatile compounds found in essential oils, were not observed in lower-altitude samples, which may be related to high air temperatures in plant geographical location. Also, significant amounts of compounds such as valerianol, polgon, limonene and epi-alpha-cadinol were observed in some samples, which shows the effect of the ecological and climatic conditions on the quality of plant essential oil.