Effect of Different Salt Stress on Physiological and Biochemical Properties of Viburnum japonicum

On June 2020, 3-year Viburnum japonicum seedlings were potted for experiment. On July 13th 2020, potted seedlings were treated by 0 (CK), 0.15%, 0.30%, 0.45%, 0.60% and 0.75% Nacl solution. Physiochemical indicators were measured 10 d, 20 d, 30 d, 40 d later. The results showed that the content of MDA, soluble protein and soluble sugar of the plant leaves increased with soil salt content. With the duration of salt stress, the activity of superoxide dismutase (SOD) of seedlings of treatment with 0.15% showed an upward trend, while that of CK and the other treatments increased first and then decreased. Peroxidase (POD) activity of treated seedlings was higher than that of CK, except that treated by 0.60% and 0.75%. But with the duration of stress, POD activity of the treatment with 0.45% continued to decrease, while that of CK and with 0.15% and 0.30% increased first and decreased later. The experiment demonstrated that V. japonicum had resistance and adaptability to soil salt content of 0.15% and below, but cannot survive for a long time under salt content of 0.30% and above.