The Effect of Sodium Silicate and Methyl Jasmonate on Pigments and Antioxidant Activity of Tomato (Solanum lycopersicum L.) Under Salinity Stress

Abstract

The present study aimed to investigate the effects of sodium silicate(Si) and methyl jasmonate (MeJA) on the pigments and antioxidantactivity of tomato, under salinity stress. For this purpose, completelyrandomized factorial design with three factors including three levelsof salinity (0, 4 and 6 dS m-1), Si (0, 4 and 8 mM) and MeJA (0, 5 and7.5 µM), and three replications was used. The present study displayedthat the increase in salinity level reduced chlorophyll index,fluorescence, and vitamin C; however, the catalase (CAT) andascorbate peroxidase (APX) activities increased. MeJA and Sienhanced the chlorophyll index and vitamin C at different salinitylevels, respectively. CAT and APX decreased when the salinizedplants were treated with MeJA and Si. MeJA and Si may act tomitigate the adverse effect of salinity stress by reducing the H2O2production. Finally, it can be concluded that MeJA and Si partiallyoffset the adverse impacts of salinity stress.