Objective: To study the effects of NaCl stress on growth

physiological index and content of effective composition of Glycyrrhiza uralensis . Method: Medicinal plant Gomposition uralensis was taken as the material. The rhizomes were grown in nutrient solution

and stressed with different concentration of NaCl. Respectively sampling after treatment of 10

20

30

40 days

liquorice growth

physiological indexes and glycyrrhizic acid and liquorice contents were determined. Result: On the treatment of 20

30

40 days

the height and the root fresh weight of 0.6% and 0.8% treatment groups were decreased as compared with CK significantly

while on the treatment of 30 and 40 days

the dry weight of 0.6% and 0.8% treatment groups were decreased as compared with control group significantly. On the treatment of 20 days

the SOD acticity and the the chloroplast pigment content of 0.6% and 0.8% treatment groups were extremely significant higher than those in the control group. And on the treatment of 30 days

the content of the glycyrrhizic acid of 0.6% and 0.8% treatment groups were increased as compared with control group significantly. While on the 20 and 30 days

the content of liquorice of 0.6% and 0.8% treatment groups were increased as compared with control group significantly. Conclusion: NaCl stress inhibited the growth of G. uralensis

and through improving the body of antioxidant enzymes activity

reducing the chloroplast pigment contents and promoting secondary metabolites accumulation

it improved its salt tolerance and the quality of G.uralensis .