Impact of Silicon Foliar in Some of Antioxidant Enzymes and Oil Yield in Safflower Cultivars Exposed to Drought Stress

Drought stress is considered as a main restriction to have the best potential crops performance in arid and semi-arid regions world. Hence, some mechanistic strategies are required manage drought detrimental influences. Silicon an essential mineral nutrient, plays important role physiology, metabolism, function of exposed stress. This study was carried out evaluate influences various irrigation regimes silicon foliar on three safflower cultivars find optimal level fertilizer. Three levels (0, 2 4 times during growth) were plots sub 1 mM) (Goldasht, Padideh Golmehr). experiment performed Firouzabad city, Fars Province, Iran with latitude 28°51' N longitude 52°36' E, 2018 2019. Malondialdehyde content (MDA), polyphenol oxidase (PPO), superoxide dismutase (SOD) ascorbate peroxidase (APX), oil yield, seed yield measured these cultivars. Interactive effects irrigation, significant (p<0.01) for MDA, APX, content. all caused decline yield. On other hands, mediated decrease effect increased amount content, PPO SOD. The highest observed Goldasht cultivar under full 2mM silicon. Thus, it can be suggested that mM may ameliorate