TY - JOUR T1 - Comparison of Essential Oils Composition in Iranian Populations of Thymus kotschyanus Boiss. & Hohen. TT - مقایسه ترکیبات شیمیایی اسانس جمعیت‎های آویشن کوهی (Thymus kotschyanus Boiss. & Hohen.) ایران JF - jmpir JO - jmpir VL - 13 IS - 52 UR - http://jmp.ir/article-1-879-en.html Y1 - 2014 SP - 136 EP - 146 KW - < KW - i> KW - Thymus kotschyanus< KW - /i> KW - Essential oils KW - Phytochemical variation N2 - Background: Thymus kotschyanus Boiss. & Hohen. is an Iranian medicinal plants that grows in different areas of Iran such as Mazandaran, Gilan, Azarbayejan, Kurdistan and Tehran. Objective: The objective was to identify the essential oil content and composition in 15 Iranian populations of T. kotschyanus. Methods: The essential oils content and composition of 15 Iranian populations of T. kotschyanus were studied in a randomized complete block design (RCBD) with three replications. The aerial parts of thyme populations were harvested in the full blooming stage. The essential oils contents were obtianed by clevenger apparatus. For accurate measurement of the essential oils compounds, the oil samples analyzed by gas chromatography (GC) and gas chromatography coupled to mass spectrometry (GC–MS). Results: The results showed that the populations of T. kotschyanus had significant (p M3 ER -