Effects of PEG Imposed Drought Stress on the Seed Germination and Seeding Growth of Impatiens Balsamina

Effects of PEG osmotic stress on seed germination and physiological characteristics of Impatiens balsamina seedlings were investigated by using different concentrations of PEG (0, 2%, 5%, 10%, 15%, 20% (W/V)). The results indicated that the germination rate, germination potential, germination index, vigor index, bud length, root length, number of lateral root and fresh weight all decreased gradually with the increasing concentration of PEG .while its MDA content increased gradually and the activity of SOD and POD in seedlings decreased gradually with PEG concentration more than 10%. The results showed that the higher concentration of PEG was used, the higher inhibition on seed germination and seedling growth or more sever damage on cell membrane was obtained.