Changes activities of antioxidant enzymes in oilseed rape in response to salinity stress

In this study, the effects of salinity stress (NaCl) on the activity of Catalase (CAT), Guaiacol Peroxidase (POD), and Superoxide dismutase (SOD) were studied in leaves of fifteen oilseed rape (Brassica napus L.) cultivars (Champlain, Hayola401, Licord, Modena, NK Aviator, NK Karibik, NK Octan, Okapy, Opera, PF, RGS, RNX 3621, SLM046, Talayeh, Zarfam). Plants were grown in a greenhouse under control (ECe= 0.9 dSm -1 ), and two levels of salinity stress (ECe = 6.9 and 11.9 dS m -1 ) respectively. A factorial experiment was performed in a completely randomized design (CRD) with 3 replications. Salinity stress had significant effect on activity of these enzymes, obviously decreased CAT activity and increased POD and SOD activity in some oilseed rape cultivars under both salinity levels. Zarfam and Licord with the highest level of enzyme activity under both control and salinity stress are reported as the most tolerant cultivar, while NK Aviator having the lowest enzyme activity, is mentioned as cultivar sensitive to salinity stress.