انتخاب بهترین سطح تنش شوری به منظور دستیابی به بیشترین محتوای کلروفیلی و فعالیت آنتی اکسیدانی در گیاه دارویی مورد

The salt stress is one of the factors limiting agricultural, horticultural and medicinal plant and production. One of main goals in medicinal plant production is to increase antioxidant content. The present study examined the impacts of different levels of salinity on Myrtus communis antioxidant activity and chlorophyll content . A pot experiment was conducted in a randomized complete block design with four treatments of salinity including ( control, 6, 9 and 12 dS) and in 4 replications. Antioxidant activity was measured using DPPH and FTC methods. Chlorophyll and cartenoid were also measured according Arnon protocols. The results showed that with increase in salinity from control treatment to 6 ds treatment, the chlorophyll and cartenoid content were decreased in leaves; however, there was not significant differences between chlorophyll a and b. The highest rate of IC50 (726.93) was observed in the control treatment while the lowest amount (564.39) was found in the treatment of 6 dS salinity. In FTC method, the highest antioxidant activity was related to 9ds treatment salinity. According to the results, salty stress could reduce the chloropyll and cartenoid content and increase the antioxidant activity in Myrtus communis.