Effect of salicylic acid on heat resistance of rice seedling under heat stress

The effect of salicylic acid (SA) pretreatment on heat resistance of “Xinongyou1” rice seedlings under high temperature stress was investigated. The study shows that 0.5 mmol·L^-1 SA pretreatment retards electrolyte osmosis in rice seedling, reduces malondialdehyde (MDA) content and superoxide anion radical () production rate. Meanwhile, contents of hydrogen peroxide (H₂O₂), proline, soluble sugar, soluble protein, vitamin C and GSH in rice seedling increase with SA pretreatment under high temperature stress. The findings suggest that SA pretreatment enhances heat resistance of rice seedling.