Effect of Different GA3 on the Germination of Tomato Seed Under Salt Stress

'Hongbeilei' tomato was used as the test material,the seeds were soaked with different concentrations of GA3 to determined the effects on tomato seed germination under 100 mmol/L NaCl stress,the effect of different GA3 on germination of tomato seed were discussed.The results showed that in the range of 50~100 mg/L,the germination energy,germination percent,germination index,radicle length and hypocotyl length increased,and MDA concentration decreased gradually with the rise of GA3 concentration in seed soaking.When the GA3 concentration reached 250 mg/L,it could restrain tomato seed germination.Seeds soaked with appropriate concentration of GA3 could promote the germination of tomato seeds under NaCl stress.The optimal effect could be obtained when the concentration of GA3 reached 100 mg/L.