Germination and Emergence Ecology of Thymus vulgaris and Thymus daenensis

Ehsan Zeidali, Shahrani Dehghan, Fereshteh Darabi

Abstract


Understanding the germination of medicinal plants to develop long-term strategies of their management can be useful. In sowing these plants, due to the high sensitivity of their seed germination, it needs to the comprehensive information on how to grow and make desirable seedbed to germination. In order to understand some ecological characteristics of Thymus vulgaris and T. daenensis, Factorial experiments carried out in a Randomized complete-block design with four replications at Islamic Azad University of Shahrekord in 2015. Effect of temperature on seed germination were evaluated in germinator under night/day fluctuating temperatures (5/15, 10/20, 15/25, 15/30 and 20/35° C), effect of salinity by using NaCl solutions (0, 10, 20, 40, 80, 160 and 320 mM) and acidity effect by using buffer solutions with adjusted pH 5 to 9. To study the effect of seed planting depth on seedling emergence, seeds were buried at different depths (0, 1, 2, 3 and 4 cm). Results showed that the effect of different temperatures on percentage, speed and time to reach 50% of maximum germination in relation to the both varieties were not significant. Germination percentage of T. vulgaris related to alternating temperatures 15/25° C night/day was by 96% during the day and the lowest germination belonged to 20/35° C by 37% and 0% respectively during the day and night. The highest germination percentage of T. daenensis was in 20/35° C by 93% in day, but other temperatures of seed germination belong to this plant was relatively acceptable. Increasing salinity reduced germination of both species. General emergence decreased with increasing planting depth. Acidity treatments had significant effect on germination. Minimum and maximum germination of T. vulgaris were observed at pH 9 and 7 up to 20% and 93%, respectively. The highest and lowest germination percent of T. daenensis were at pH 7 and 9 up to 94% and 19%, respectively.

 

Keyword:  Acidity, Germination Temperature, Planting Depth, Thymus daenensis, Thymus vulgaris


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