Water deficit effect on morphology, prolin content and thymol percentage of Thyme (Thymus vulgaris L.)

Document Type : Research Paper

Authors

1 MSc Student, Department of agronomy and plant breeding, Agricultural College, University of Shahed, Tehran, Iran

2 Department of agronomy and medicinal plants research center, Agricultural College, University of Shahed, Tehran, Iran

3 Department of agronomy, Agricultural College, University of Tarbiat modares, Tehran, Iran

Abstract

Water deficit stress, permanent or temporary, limits the growth and the distribution of natural vegetation and the performance of cultivated plants more than any other environmental factors. Mechanism involved is still not clear. Thyme (Thymus vulgaris L.) is an important medicinal plant in perfume and medical industry. In this research, the effects of water deficit stress on growth, yield, metabolites compatible (prolin) and oil composition of thyme (thymol) were studied. Complete randomized block design with 4 treatments and 4 replications have been used in 2006. Water deficit levels included control (100% field capacity), mild stress (85% field capacity), medium stress (70% field capacity) and severe stress (55% field capacity). The statistical analysis showed that water deficit had significant effect on growth parameters, yield biomass, prolin and thymol. Water stress decreased plant height, number of secondary branches, dry and fresh weight growth and root mass, dry and fresh weight root and length root. In addition, thymol percentage and prolin content increased with severe stress (55% field capacity). Morphological yield with secondary metabolites prolin and thymol were obversed with water deficit changes.

Keywords


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