Investigation effect of salicylic acid on morpho- physiologic traits improve in three masses of C. copticum plant in Damghan Area

Ajowan (Carum copticum L.) is one of the native medicinal plants that has many applications in the pharmaceutical industry and traditional medicine. Salicylic acid is a simple phenolic compound that play regulate role in many developmental processes of plants. This study has done to investigate salicylic acid effect on some of the morphological and physiological traits of three C. copticum masses in Damghan climate in 2012-2013. So, the factorial experiment has performed as complete randomized blocks with three replicates. In this study, three masses of Ajowan including Isfahan, Arak and Fariman Mashhad and salicylic acid treatment in three levels of 0.5, 1 and 1.5 mM/l were used. At the end of plants growing season, morph-physiological traits including plant height, height of main stem, number of umbelets and umbrella, dry weight of shoot and seed, thousand-seed weight, proline, carbohydrate and chlorophyll (a, b, total and carotenoid) content was measured. The results showed the impact of high level of salicylic acid on the majority traits of C. copticum. Also, Arak mass had the most reaction and Fariman mass had the lowest response to this treatment. Variety of Arak had the best reaction to the Damghan climate and it had the best efficiency in evaluated parameters. There is significant interactions between masses and salicylic acid levels.