Investigation of Daljin Growth Regulator (Ascophyllumnodosum Extract) under Salt Stress Conditions on Agronomic and Physiological Traits of Barley (Hurdeumvulgare L.)

In order to study the effect of different levels of Daljin growth regulator on agronomic and physiological traits of barley under salt stress, a factorial experiment was conducted in a completely randomized design at the Faculty of Agriculture, Islamic Azad University, Varamin-Pishva Branch, in 2016-2017. The treatments consisted of salt stresses at zero (control), 75 and 150 mM, and foliar application of Daljin in zero (control), 0.5, 1 and 2 at 1000. The measured traits included 1000 seed weight, yield of a plant, seed protein percent, proline, catalase and leaf relative water content. The results showed that salt stress reduced the weight of 1000 seeds, yield of a plant, relative water content of leaves and increased protein content of grain, catalase and proline. Also, Daljin spraying resulted in 1000 seed weight gain, yield of a plant, relative water content of leaves and proline. In the salinity conditions of 75 mM, the highest yield of a plant was related to treatments 1 and 2 at 1000 Daljin (8.49 and 8.9 grams respectively). The highest protein content of the seeds was 16.6% in the 150 mM salinity treatments and in the absence of spraying. It can be concluded from the results of positive effects of Daljin, especially in salt stress conditions, and the reduction of the negative effects of salinity in barley plants, and the highest positive effect was obtained by spraying 1 and 2 at 1000 dalijin.