Study On The Character Of Seed Germination Of Poacynum Hendersonii (Hook.f.) Woodson And Halocnemum Strobilaceum (Pall.) Bieb. Under The Saline Stress

Poacynum bender sonii (Hook, f.) Woodson is one of the builders of saline meadow distributed widely in desert zone of Asia, Halocnemum strobilaceum (Pall.) Bieb. is an important kind of edificato of desert vegetation.The test way that seed was cultured in laboratory was adopted in this paper. The character of seed germination under the effect of the ecological factors of salt solution, temperature, light was discussed. Salt solution promoted seed germination of P. hendersonii as NaCl concentration was less than 0. 6 g/100ml and soil-salt concentration was less than 1.0 g/100ml, the alternate temperature at 25-35℃ was optimum for germination of P. hendersonii, light had no distinct difference to it. Salt solution had same result what salt promoted seed germination of H. strobilaceum as NaCl concentration was less than 0. 2 g/100ml and soil-salt concentration was less than 0.2 g/100ml, the alternate temperature at 10-25℃ was optimum for germination of H. strobilaceum, the condition of germination in light was distinctly better than that in dark. It took P. hendersonii seed 3 days to approach to over 30% germination percentage under the treatment of NaCl solution and 1 day to do that under soil-salt solution. Similarly, It took H. strobilaceum seed 6 days to approach to over 80% germination percentage under the treatment of NaCl solution and 3 days to do that under soil-salt solution. As concentration of salt solution increased, the vigor index, germination index and the length of shoot and radical gradually decreased. The radicle was sensitive to salt stress and had low tolerance. It can be concluded that P. hendersonii has high salt tolerance, H. strobilaceum has low salt tolerance.It can improve germination percentage of seed and reduce production cost only if the appropriate conditions such as relatively low saline soil and optimum temperature are chosen.