اثر سیلیکون بر فعالیت آنزیمهای آسکوربات پراکسیداز و گوآیکول پراکسیداز تحت تنش خشکی

Silicon is the second most beneficial element in plant growth. Most of the studies are discussed on the beneficial effects of silicon in soil fertility and plant growth. Salicylic acid has a very important impact on the growth and increase the resistance of plants to drought stress. Accordingly, Effect of drought stress on antioxidant enzymes activities, ascorbate peroxidase and guaiacol peroxidase was investigated in two line of two-row barley named CB-20315(resistant) and CB-20213 (sensitive) in four leaves stage in greenhouse. The experiment preformed in randomized factorial design in three treatments, control, drought and silicon-drought (sodium silicate 2 mg / 1kg), with three replication. The results showed that in both varieties, silicon application increased activity of antioxidant enzymes under drought stress. Therefore silicon reduces oxidative damage induced by reactive oxygen species and protects physiological processes in plants under stress.