University of Isfahan Journal of Plant Biological Sciences 3041-9603 9 3 2017 11 22 Comparison of physiological responses of linseed (Linum usitatissimum L.) to drought and salt stress and salicylic acid foliar application Comparison of physiological responses of linseed (Linum usitatissimum L.) to drought and salt stress and salicylic acid foliar application 39 62 22324 10.22108/ijpb.2018.103383.1014 FA Mohsen Movahhedi Dehnavi Agronomy and plant breeding department, Faculty of Agriculture, Yasouj University, Yasouj, Iran. Nasrin Niknal Department of Agronomy and Plant Breeding, Faculty of Agriculture, Yasouj University, Yasouj, Iran. Yaqoub Behzadi Department of Agronomy and Plant Breeding, Faculty of Agriculture, Yasouj University, Yasouj, Iran. Raham Mohtashami Department of Agronomy and Plant Breeding, Faculty of Agriculture, Yasouj University, Yasouj, Iran. Reza Bagheri Department of Agronomy and Plant Breeding, Faculty of Agriculture, Yasouj University, Yasouj, Iran. Journal Article 2017 04 10 In order to compare the physiological responses of linseed (<em>Linum usitatissimum</em> L.) in drought and salinity stress conditions and salicylic acid foliar application, a greenhouse experiment was conducted based on completly randomized design with three replications in Yasouj university in 2015. Treatments including different levels of salinity and drought with similar osmotic potentials (-2, -4, -7 and -9 bar) in 8 levels and a control treatment were applied in Hoagland solution. Second factor was salicylic acid foliar application in 2 levels (0 and 0.5 mM). Salinity and drought applied using sodium chloride and polyethylene glycol 6000, respectively. The results showed that leaf protein content, catalase activity, total chlorophyll and carotenoid significantly decreased compared to control by increasing salinity and drought levels, however salicylic acid could prevent this trend.  Proline soluble sugars and malodealdehide content significantly increased compared to control by increasing salinity and drought. However salicylic acid could not prevent this trend. Shoot and root dry weights significantly decreased in salinity and drought stress treatments, compared to control and salicylic acid could prevent this decrease. Generally regarded to the most of the measured traits, impact of drought was more than salinity and salicylic acid could compensate the stress impacts on linseed. <strong> </strong> In order to compare the physiological responses of linseed (<em>Linum usitatissimum</em> L.) in drought and salinity stress conditions and salicylic acid foliar application, a greenhouse experiment was conducted based on completly randomized design with three replications in Yasouj university in 2015. Treatments including different levels of salinity and drought with similar osmotic potentials (-2, -4, -7 and -9 bar) in 8 levels and a control treatment were applied in Hoagland solution. Second factor was salicylic acid foliar application in 2 levels (0 and 0.5 mM). Salinity and drought applied using sodium chloride and polyethylene glycol 6000, respectively. The results showed that leaf protein content, catalase activity, total chlorophyll and carotenoid significantly decreased compared to control by increasing salinity and drought levels, however salicylic acid could prevent this trend.  Proline soluble sugars and malodealdehide content significantly increased compared to control by increasing salinity and drought. However salicylic acid could not prevent this trend. Shoot and root dry weights significantly decreased in salinity and drought stress treatments, compared to control and salicylic acid could prevent this decrease. Generally regarded to the most of the measured traits, impact of drought was more than salinity and salicylic acid could compensate the stress impacts on linseed. <strong> </strong> https://ijpb.ui.ac.ir/article_22324_71d9ac1ff1dccbfe18b41a58caee3757.pdf