Document Type : Research Paper
Authors
1 Ph.D. student, Agronomy Department, Faculty of Agriculture, University of Birjand, Iran; Researcher of Khorasan Razavi Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Mashhad, Iran
2 Faculty member, Department of Agronomy and Plant Breeding, Faculty of Agriculture, University of Birjand, Birjand, Iran; Plant and Environmental Stresses Research Group, University of Birjand, Birjand, Iran
Abstract
Medicinal plants are a rich and valuable source of secondary metabolites that are strongly influenced by the environmental factors, especially drought stress. In this regard, a greenhouse experiment was conducted on Thymus vulgaris L. as split plots in a randomized complete block design with three replications. The main plot included three levels of moisture supply (40, 65, and 90% of potting soil field capacity (FC)) and the sub-plot was the elicitors levels including (1) control: without elicitor, (2) 150 µM cyclodextrin (CYC), (3) 75 nM coronatine (COR) + 150 µM CYC, (4) 150 nM COR + 150 µM CYC, (5) 150 µM methyl jasmonate (MJ) + 150 µM CYC, and (6) 300 µM MJ + 150 µM CYC. Except for the essential oil percentage, the other traits including the leaves proline content, electrolyte leakage, relative water content, plant height, canopy diameter, dry and fresh weight of shoots, dry weight of leaves and stems, and weight of essential oil had a very significant correlation with each other. The highest amount of leaves proline was obtained form the interaction of elicitors (levels 4 and 6) and the 40% FC level of moisture supply (3.88 and 3.94 μmol g-1 fresh leaf weight, respectively). The highest amount of plant height (28.3 cm), canopy diameter (17 cm), and relative water content (79%) was observed at the 90% FC level of moisture supply. The highest percentage of essential oil was obtained in the treatment of non-application of elicitor (2.67%) and the highest essential oil weight per plant (0.092 g plant-1) was observed in the treatment of non-application of elicitor at the 65% FC level of moisture supply. The mild stress increased the essential oil yield and the elicitor treatments decreased it.
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