Variation in the essential oil composition of Perovskia. atriplicifolia plant at different growth stages in Taftan aera

Perovskia.atriplicifolia.Benth is extensive ethno medical tradition that the photochemistry of this plant has been the topic of several studies. The purpose of this research, study of variation in the essential oil composition of Perovskia. atriplicifolia plant at the different growth stages from Taftan mountain .The leaves of P. atriplicifolia were harvested at the before flowering, flowering and at complete flowering stages.The essential oils were extracted by hydro distillation method and were analyzed by the GC & GC-MS techniques.Oil yields (w/w%) related at three stages of plant growth were in the order of: before flowering (1.28), flowering (1.15) and at complete flowering (1.03). In total 52, 62, 43 components were identified using Kovats indices and quantified in the oils of the before flowering, flowering and at complete flowering stages that representing 92.0 %, 86.31%, 66.46 % of total oil respectively. The higher percent of which: geranyl acetate, 1,8-cineole, δ-3-carene ,trans-caryophyllene, bornyl acetate ,camphene,valeranone,α-pinene,were the main compounds in all oil samples.Total terpenoids were the main group of compounds in the before flowering (91.58 %), flowering (84.03 %) and at complete flowering stages (65.72 %) respectively.The before flowering stage sample’s essential oil is of the best quality.