Effect of drought stress on germination in 18 population of thyme (Thymus kotschyanus)
Paper Details
Effect of drought stress on germination in 18 population of thyme (Thymus kotschyanus)
Abstract
Thyme is an important medicinal plant of Iran that have Thymol and Carvacrol and used for antimicrobial and antibacterial agent. The present study was carried out to determine the effect of drought stress in 18 populations of this species. The environmental stress such as, drought are serious obstacles for medicinal plants and field crops in further areas of the world, especially arid and semiarid regions. To create drought stress, polyetylenglycol (PEG) 6000 in osmotic levels at 0 (as control), -0.2, -0.4, -0.6 and -0.8 MPa were used. Effect of drought levels on investigated traits significant at 0.01. Result showed significance different between evaluated indices. Increasing of stress levels lead to reduction of germination and root and shoot length. Comparison of traits in the populations and different levels PEG application showed the highest germination in the population of Zanjan 2, Unknown 2 and Zanjan 4, respectively. For this trait in normal conditions and severe stress, there was no major difference between T. kotschyanus population. In terms of the radicle length, population of Zanjan 2 and Ghazvin 3 were higher than others. There was a lot variety in seed vigor. Population of Zanjan 2, Ghazvin 3 and Zarand were higher than others. Accessions Zanjan 2, Az. Gharbi 1, Qazvin 3, Zanjan 4 and Qazvin 2 in the majority of traits related to germination, your positive characteristics somewhat maintain in different levels of PEG stress . Accession combination of the above can use as a mass suitable for cultivation in rainfed and low yields rangelands.
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