Comparison of two varieties (var. kotschyanus and var. glabrescens) belonging to Thymus kotschyanus Boiss.et Hohen (Lamiaceae) in meaning of the morphological features and esstential oil composition

ABSTRACTMaster ThesisCOMPARISON OF TWO VARIETIES (var. kotschyanus ve var. glabrescens) BELONGING TOThymus kotschyanus Boiss.et Hohen (Lamiaceae) IN MEANING OF THE MORPHOLOGICALFEATURES AND ESSTENTIAL OIL COMPOSITIONSerkan DoğanFırat UniversityDepartment of Biology2007, Page: 28In this study, the morphologic features and essential oils compositions of two varieties, (var.kotschyanus and var. glabrescens) belonging to the Thymus kotschyanus collected from Elazığ vicinitywere determined and both taxa were compared in view of these features. The essential oils of thesesamples were obtained by hydrodistillation and qualitative and quantitative differences and similaritieswere determined. Essential oil composition of both varieties were found similar by the maincompounds. While qualitative differences were not more observed, quantitative differences wasimportant between both varieties essential oil in view of essence components. The dominantcomponents observed in the essential oil Thymus kotschyanus var. glabrescens and var. kotschyanuswere thymol (% 59.9 - 30.4), p- cymene (%8.52-2.10), borneol (% 4.56-5.23), 1.8. cineole (%3.38-4.13) and beta-caryophyllene (%1.50- 2.89) respectively. In both varieties essential oils studied,monoterpene components were found dominant while the amount of other group components werelower. In this study, the results obtained from morphological and chemical characterization twovarieties belonging to Thymus kotschyanus will be doing contributions for the morphology,chemotaxonomy and systematics of Thymus genus.Key Words: Thymus, Lamiaceae, Essential Oils, Morphology, Chemotaxonomy