تأثیر سالیسیلیک و آسکوربیک اسید بر برخی صفات فیزیولوژیک سویا (رقم ویلیامز) تحت تنش شوری

In order to investigate the effects of foliar application of salicylic and ascorbic acids on some physiological characteristics of soybean (Glycine max L. cv. Williams) under salinity stress, a factorial pot experiment was conducted based on completely randomized design with four replications in the summer 2012 in the Yasouj University. Factors were included of four levels of salinity (0, 50, 100 and 150 mM NaCl) and four levels of foliar application (water, salicylic acid (3 Mm), ascorbic acid (1.5 mM) and combination of salicylic acid 3 mM and ascorbic acid 1.5 Mm. Results showed that by increasing salinity, photosynthetic rate, stomatal conductance, leaf chlorophyll, carotenoids and proteins content and leaf area significantly decreased. Leaf water use efficiency significantly decreased by increasing salinity levels, so that maximum leaf water use efficiency obtained in the first salinity level and foliar application of ascorbic acid 1.5 Mm. Foliar application of salicylic acid 3 mM and ascorbic acid 1.5 Mm were regarded as the best treatments for mitigation of salinity impact on soybean leaf because of being superior at the highest level of salinity (150 Mm NaCl) for the total leaf chlorophyll and carotenoids content, photosynthesis, water use efficiency and leaf relative water content