Effect of salinity stress and salicylic acid on physiological characteristics of Lallemantia royleana

Water and soil salinity is one of the environmental factors that can cause stress and limiting the growth and production of plants. So finding methods and strategies to induce stress resistance or modifying the harmful effects of salinity on plants has been considered. The use of plant growth regulators is one of the strategies to overcome the harmful effects of salinity. In order to study the effects of different levels of salinity and salicylic acid on physiological traits of Balangu (Lallemantia royleana) a factorial experiment was conducted based on completely randomized design (CRD) with five treatments and three replications. Two Experimental factors were included five different salinity levels (0, 2, 4, 6, 8 dS/m) and two different concentrations of salicylic acid (0 and 200 ppm). Based on results the interaction of treatments on leaf proline and protein content, the concentration of Na and K in leaf and also the activity of catalase and proxidase enzymes were significant. According to the results by increasing the salinity stress, the proline content increased whereas application of salisilic asid decreased the proline content. As a result of foliar application of salicylic acid the mean activity of catalase enzyme about 15% increased but in the same condition the activity of proxidase enzyme more than 13% decreased. Application of salisilic acid also have negative effect on leaf potassium content and its amount reached to about 50 g/Kg DW of leaf.