Document Type: main article
Assistant Professor Department of Physiology, Kaleybar Branch, Islamic Azad University Kaleybar, Iran
Drought stress and climate changes cause damage and reduction in agricultural crops. In order to investigate the effects of superabsorbent polymer (SAP) application on reduction of drought stress impacts on some physiological traits and activity of some antioxidant enzymes in wheat (Triticum aestivum cv. Mihan), an experiment was conducted using a split-plot arrangement in randomized complete block design with three replications in research field of Islamic Azad University of Kaleibar, Iran in crop year 2017. Experimental treatments included irrigation intervals in main plots (after 60, 90 and 120 mm evaporation from class A pan) and different amounts of super absorbent polymer (Zero; control, 75 and 150 kg.ha-1 superabsorbent polymer) in sub plots. Analysis of variance showed the effects of superabsorbent polymer, drought stress and interaction between superabsorbent and drought stress in the probability levels of 1 and 5 percent were significant for most traits. The results also showed by exerting drought stress, the activity of antioxidant enzymes increased and the levels of chlorophyll a, chlorophyll b, carotenoids and relative water content decreased. Nevertheless, although using superabsorbent significantly increased physiological traits but it decreased the activity of antioxidant enzymes. The irrigation level of 210 mm evaporation had the greatest impact on the activity of antioxidant enzymes and osmotic regulators. The highest increase in most examined traits obtained when 75 kg.ha-1 of super absorbent was used. According to the results, superabsorbent polymer resulted in mitigating the adverse effects of drought stress on wheat plants.