Effect of salicylic acid on growth parameters, osmolytes and osmotic potential in radish (Raphanus sativus L.) under salt stress

Soil salinity is a serious environmental problem that has negative effect on plants growth and production. On the other hand، salicylic acid is one of strong candidates for stress ameliorators that have been recently recognized as a plant hormone like substance. This study was conducted to investigate effects of salt stress (180 mM) and salicylic acid (0. 2 mM) on growth parameters and osmolytes in radish (Raphanus sativus) plant. Results released that salicylic acid and salt stress had negative effect on growth parameters. The effect of salt stress with salicylic acid on growth of plants was obvious. Salt stress and also salicylic acid increased soluble sugars of leaves and roots. Whereas salt stress didn’t have any effect on amino acids، salicylic acid caused to increase that in leaves and root tissues. Content of soluble proteins decreased under salt stress and increased by salicylic acid treatment. Both of treatments caused more negative osmotic potential.