Abstract:By taking six provenance seeds of species Chukrasia tabularis A.Juss as the test material and through simulating drought stress with different concentrations and osmotic potential of polyethylene glycol (PEG-6000),the effects of drought stress on germination rate,germinating potential,radicals,hypocotyls length,germination index,viability index and ratio of root to shoot were investigated.The results showed that:(1)PEG retarded the proceeding of seeds germination of C.tabularis and the germination percentage,germination index and seed viability index were all showed the downtrend obviously with increasing concentration of water stress;The seeds treated with -0.86 MPa water potential of PEG did not germinate at all after the experiment finished.So this indicated -0.86 MPa water potential was the threshold for the germination of C.tabularis seeds.(2)When the water stress above -0.40 MPa,C.tabularis seedling radicale length was no significant difference and even longer than that of control group.The findings revealed that the water potential higher than -0.40 MPa was beneficial to the growth of the radicals of C.tabularis seeds;the growth of C.tabularis seedlings decreased with arising PEG concentrations.(3)The ratio of root to shoot as an important indicator of sound seedling,appropriate water stress could increase the ratio of root to shoot.When the water stress higher than -0.20 MPa,the ratio of root to shoot of all kinds provenance have reached the maximum.In Summary,C.tabularis seed can germinate under appropriate drought stress.The seeds from Khin Aye Pale and Phu Wiang is better than that from Sanya and Ulu Tranan.