Study on Mechanism of Salicylic Acid on the Promotion of Rice Seeds Germination under Salt Stress

In order to explore the mechanism of salicylic acid(SA) in the regulation of plant responses to salt stress,the effects of 0,0.25,0.50,1.00,2.50,5.00 mmol/L SA on germination and antioxidant capacity of rice were studied.The results showed that seeds germination was delayed by various SA under natural growth condition.However,under salt stress,seeds germination was promoted by the lower concentration(0.25,0.50 mmol/L) SA but delayed by the higher concentration(1.00,2.50,5.00 mmol/L) SA 0.50 mmol/L SA decreased significantly malondialdehyde and hydrogen peroxide content and increased the activities of peroxidase and superoxide dismutase and glutathione content.The results suggested that the lower concentration SA could promote rice seeds germination under salt stress by increasing antioxidant capacity.