| Under drought stress simulated by different concentrations of PEG 6000, the rate of germination and e-
mergence were both reduced in each osmotic potential, but the final gemination percentage was not affected . The gemi-nation percentage was reduced by 3.9%~86.9%0 compared to the control with the decrease of osmotic potential at -0.5~-1. 0 MPa, and there was no emergence at
-0.6~- 1.0 MPa. On the 7th day，ungeminated seeds of each treament were transferred to the distilled water，the gemination percentage reached 97. 3%~98.3%, and the difference was not significant compared to the control . Drought stress reduced seed vigor, mean germination time (MGT) increased by 0.1~1.5 d, germination index (GI) deceased by 2.9%~96.45%, and seedling vigor index(SVI) (during -0.1~-0.5 MPa) deceased by 5.0%~23.8%. Drought stress reduced shoot and root length， while the shoot lengh de-creased more than root length， root/ shoot ratio was highly increased with osmotic decreasing. |