Study on some ecological factors, morphological traits, ploidy levels and essential oil composition of Thymus pubescens Boiss. & Kotschy ex Celak in two natural regions of East Azerbaijan province | ||
| تحقیقات گیاهان دارویی و معطر ایران | ||
| Article 6, Volume 26, Issue 4 - Serial Number 50, February 2011, Pages 500-512 PDF (347.73 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/ijmapr.2011.6666 | ||
| Authors | ||
| A.R. Yavari1; V. Nazeri* 2; F. Sefidkon3; M.E. Hassani2 | ||
| 1MSc Student, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran | ||
| 2Horticultural Department, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran | ||
| 3Medicinal Plants Research Division, Research Institute of Forests and Rangelands, Tehran, Iran | ||
| Abstract | ||
| In order to evaluate sثرثقشم ecological factors and morphological traits and also to determine ploidy levels and chemical composition of essential oil of Thymus pubescens Boiss. & Kotschy ex Celak two natural habitats, Bostan-Abad and Yam habitats, were chosen in East Azerbaijan province. To study and evaluate quantitative morphological characters, five complete plants and flowering branches were collected from each locality at flowering stage for essential oil extraction. Seeds also were collected in seed production season to study seed characters and chromosome counting. Ecological data of both localities also were recorded. Vegetative and reproductive traits of each population were studied and essential oil of each locality was analyzed by combination of GC-FID and GC-MS. At least 10 mitotic cells of each population were studied to determine chromosome number and ploidy levels. Results revealed that specimens from “Yam” had the longest flowering stems, the largest leaves and flowers, and also the highest number of flowers per inflorescence. Chromosome count results showed that specimens from Bostan-Abad were hexaploid (2n = 6x = 90) and those of Yam were tetraploid (2n = 4x = 60). The total yield of oils based on dry weight was 1.3% and 2.2% (w/w) from Bostan-Abad and Yam, respectively. Thymol was the main valuable phenolic compound similar to most of the species of genus Thymus (Bostan-Abad: 57.6% and Yam: 44.9%). | ||
| Keywords | ||
| Thymus pubescens Boiss. & Kotschy ex Celak; morphological traits; ploidy levels; essential oil; Thymol | ||
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