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Essential oils of the air-dried aerial parts of five populations of Thymus migricus Klokov &amp; Desj.-Shost. collected from northwest Iran were obtained by hydrodistillation with yield of 1.1 – 3.3% (w/w). The essential oils were analyzed by a combination of GC-FID and GC-MS techniques, to check for chemical variability. According to populations, twenty-nine components, representing 97.3 – 99.3% of the total components, were identified. Oxygenated monoterpenes were the main group of constituents in all samples (65.2 – 78.5%). Thymol (46.6 – 72.5%), γ-terpinene (6.2 – 16.7%), p-cymene (4.0 – 6.5%), n-hexadecanol (0.4 – 6.5%), geraniol (0.5 – 4.7%), limonene (0.0 – 3.5%) and carvacrol (0.5 – 3.4%) represented the major compounds. Two chemotypes were identified: thymol and thymol/linalool. In addition, canonical correlation analysis between some essential oil characters and some environmental factors revealed a significant relationship between oil components and environmental factors. The influence of environmental factors over p-cymene, γ-terpinene, linalool and thymol was evident. Essential oil yield was fairly strongly related to the concentrations of Ca 2+  and K + , percentage of organic matter, altitude, temperature, and soil texture.

Influence of Some Environmental Factors on the Essential Oil Variability of Thymus migricus