Effects of PEG and NaCl on the Germination of Glycine soja under Iso-osmotic Stress

Objective The aim of the research was to clarify the relationship of drought stress and salt stress and provide basis for the research on stress resistance as a whole Method NaCl and PEG were used to simulate salt stress and drought stress to determine germination rate,the germination potential,the germination index and growth conditions of Glycine soja seeds under iso-osmotic stress.Result PEG treatment inhibited the germination of G.soja and the germination rate of seeds treated with-0.4、-0.8 MPa PEG in the 1st day of counting were obviously lower than that of CK.Treatment with-0.4 MPa NaCl promoted the germination of G.soja and the germination rate in the treatment with-1.6 MPa NaCl was obviously reduced.Low concentration of PEG and NaCl had little effects on the germination rate,high concentration of PEG and NaCl reduced the germination rate and the inhibition effect of iso-osmotic PEG on the germination rate of G.soja was stronger than that of NaCl.The changes of the germination potential and the germination index were similar to that of the germination rate and PEG and NaCl reduced seed germination potential.Conclusion The seeds of G.soja had greater germination tolerance to salt stress.Osmotic stress was main factor that influenced seed germination of halophyte in the concentration rage of this test.