Abstract:It is well known that the drought stress may induce active oxygen species (AOS) generation and cause injuries to plants at various degrees. Defense enzymes such as SOD, POD and CAT etc, which clean AOS, exist in plant cells. AOS such as O ·- 2、OH · 、H 2O 2 were cleansed effectively and the degrees of lipid peroxidation and cell membrane injury were decreased by the compatible functions of these enzymes. Liquorices(Glycyrrhiza uralensis) can survive in some extreme environmental conditions such as...