آویشن کوهی (thymus kotschyanus boiss

In order to investigate the morphological reactions of Thymus kotschyanus Boiss. cutting to auxins (IAA and IBA) in different concentrations, an experiment was conducted in 2009 at the greenhouse conditions of Semnan Agriculture and Natural Resources Research Station. This research was conducted as a factorial experiment in a randomized complete block design with 3 replications and 20 observations per replication. The treatments included A: two types of auxin (Indole-acetic acid (IAA) and Indole-3-butyric acid (IBA)) and B: concentrations of auxin, (0, 100, 200, 300, 1000, 2000 and 3000 ppm). The traits studied were the root length and number, the percentage of rooting and dry root weight and new buds in plants. Results showed that the highest root dry weight and the root length were observed in the cuttings treated with 100 and 300 ppm of auxins. These concentrations (100 and 300 ppm) of auxins respectively stimulated root dry weight by about 3.6 and 3.25 times higher than control plants and increased the root length by about 150 and 90 percent more than control cuttings. The highest root length, root number, and number of new buds in the cuttings of Thymus kotschyanus were obtained due to the application of IAA as compared with IBA. Our findings confirm that the cuttings treated with 100 ppm of IAA can produce the highest quality transplants at commercial scale.

Thymuskotschyanus Boiss. & Hohen. is a perennial medicinal shrub growing wild in some regions of Iran including Yazd province. This research was carried out in order to analyze oil quantity and quality of cultivated Thymuskotschyanus in the Medicinal Plants Farm, Yazd, Iran. The seeds of 19 accessions collected from natural habitats were sown in a greenhouse and the seedlings were planted in the farm. Shoots were harvested at 50% flowering stage in the second year and dried under shadow. Essential oil was extracted with water distillation method and oil components were identified after determining oil content. The highest amounts of oil content respectively were related to accessions TK7 (3.42%), TK12 (3.22%), TK17 (2.66%) and the lowest amount was observed in accession TK6 (0.79%). The highest amounts of oil production respectively were recorded in accessions TK5 (38.3kg/ha), TK7 (36.4kg/ha) and TK12
(36.1 kg/ha) and the lowest amount was related to TK1 (1.3 kg/ha). Cluster analysis based on eleven oil components classified the accessions into three groups. The first group, (TK2, TK6, TK13, TK18, TK16, TK19), was rich for thymol-p-cymene, the scond group (TK1, TK3, TK4, TK5, TK7, TK11, TK14, TK15, TK17) for carvacrol-thymol and the 3rd group (TK8, TK9, TK10, TK12) was rich for Geraniol-linalool. In general, accessions TK7, with 3.42% oil content, 36.4 kg/ha oil production and 63.8% carvacrol; TK14, with 2.2% oil content 35.5 kg/ha oil production and 47.2% carvacrol and thymol, TK5 with 2.4% oil content, 38.3 kg/ha oil production and 57% thymol and carvacrol are proposed as superior accessions.