%0 Journal Article %T Effect of Seed Treatment on Physiological Traits of Two Safflower Cultivars under Defoliation %J تولیدات گیاهی %I دانشگاه شهید چمران اهواز %Z 2588-543X %A Pedram, Mina %A Hatami, Ali %A Moradi Telavat, Mohammad Reza %A Tahmasebi, Zahra %D 2020 %\ 12/21/2020 %V 43 %N 4 %P 507-516 %! Effect of Seed Treatment on Physiological Traits of Two Safflower Cultivars under Defoliation %K Antioxidant %K Oilseed %K Photosynthesis %K Priming %R 10.22055/ppd.2020.31631.1845 %X ABSTRACTIntroduction:To evaluate the effects of priming and defoliation on some physiological traits of two safflower cultivars, a factorial experiment was conducted as a randomized complete block design with three replications in the research farm of Agricultural Sciences and Natural Resources University of Khuzestan in the crop years of 2017 and 2018.Materials and Methods:The experimental factors consisted of two cultivars of safflower (Esfahan local and Sofeh cultivars) and three levels of priming with [Salicylic acid (SA) 0.9 milli molar, polyethylene glycol (PEG)- 6000 (-10 MPa)] and control at two defoliation levels (without defoliation and 50% defoliation in lower parts of plant).Results and Discussion:The results showed that the defoliation and priming treatments had significant effects on chlorophyll a, chlorophyll b, and carotenoid content, in such a way that the priming with salicylic acid and polyethylene glycol was associated with a significant decrease in chlorophyll a (34.54%) and chlorophyll b (42.59%); although, the content of carotenoid increased in defoliation and priming with PEG (38.22), carotenoid was decreased in the treatment of defoliation and priming with salicylic acid. Defoliation treatment significantly (28.11%) increased the activity of ascorbate peroxidase in comparison to the control.Conclusion: Generally, the results showed that the highest enzyme activity of ascorbate peroxidase (29.26%) was observed in the first year of priming with polyethylene glycol. The highest amount of catalase activity (27.45%) was also observed in Isfahan local cultivar and salicylic acid priming under 50% defoliation. The amount of Malondialdehyde decreased in priming with PEG, however, it increased (33.1%) in priming with salicylic acid and 50% defoliation treatment. %U https://plantproduction.scu.ac.ir/article_15810_8fc189886ec2916b16139924f727e5ec.pdf