Document Type : Original Article
Authors
1 Islamic Azad University, Mahabad Branch
2 Shahed University
3 Department of Environment
4 , Department of Environment, Piranshaher
Abstract
Medicinal plants are important sources of medicinal compounds that have been used in the treatment of many diseases since ancient times. In order to investigate the effect of salicylic acid on the quantitative and qualitative characteristics of marjoram medicinal plant under salinity stress conditions, a factorial experiment was conducted in the form of a completely randomized design with three replications in pots during the year 2015-2016 in the Agricultural and Natural Resources Research Greenhouse. West Azerbaijan was implemented. The first factor is salinity stress at four levels (0 (distilled water), 50, 75 and 100 mM caused by sodium chloride salt) and the second factor is salicylic acid at four levels (0, 0.5, 1 and 1.5 mM). The studied traits included plant height, thousand seed weight, seed and biological yield, essential oil percentage and yield, proline content, malondialdehyde content and antioxidant enzymes. The results showed that the traits evaluated in the present study were affected by the simple effects of salicylic acid and salinity stress. The research results showed that salinity stress decreased plant height, thousand seed weight, seed and biological yield, proline content, essential oil percentage, essential oil yield and antioxidant enzymes content. Also, the use of salicylic acid improved the mentioned traits. The use of salicylic acid increased the activity of the aforementioned antioxidant enzymes and the accumulation of proline. The use of 1.5 mM salicylic acid can be recommended to improve and increase the morphological and physiological characteristics of marjoram medicinal plant.
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