تاثیر شوری و سالیسیلیک اسید بر ویژگی‌های مورفولوژیک و فیزیولوژیک سورگوم در ‏‏ مراحل اولیه رشد‎(Sorghum bicolor (L.) Moench)‎

In order to evaluate morphological and physiological responses of sorghum (Pegah ‎cultivar) to salt stress (0, 5, 10 and 15 dS/m) and different salicylic acid (SA) levels ‎‎(0, 0.75 and 1.5 mM), an experiment was carried out in research green house of ‎college of Agriculture Shiraz University during 2012 using a factorial as randomized ‎complete block design with four replications. The results showed that salinity ‎reduced stem length and leaf area of sorghum and the effect of salinity level at 15 ‎dS/m was more pronounced. On the contrary, foliar application by SA increased ‎these parameters. Moreover, salt stress and foliar SA increased the activity of ‎catalase, superoxide dismutase, peroxidase and ascorbate peroxidase and ‎chlorophyll content. In summary, it can be concluded that foliar application of ‎sorghum by SA improved growth and enhanced salt tolerance in this plant. Indeed, ‎SA stimulated sorghum growth under salinity stress via enhanced anti-oxidant ‎defense system, reduced oxidative stress and increased photo synthetic pigments. ‎