Effects of Acid and Alkali Treatment on the Ggrowth and Physiology of Symplocos tetragona

LI Wen-ming;ZHANG Yue;XIN Jian-pan;TIAN Ru-nan;College of Landscape Architecture,Nanjing Forestry University;

Symplocos tetragona;;acid and alkali treatment;;growth index;;physiological index

Seedlings of 2-year-old Symplocos tetragona were cultured by hydroponics with different pH(4.5,5.5,6.5,7.5,and 8.5)to observe the growth and physiological characters of the seedlings,and to further reveal the mechanism of the plant to the variation of pH environment.The results showed that the biennial seedlings were somewhat tolerable to acid treatment and it could grow normally within the pH range of 5.5-7.5.Acid and alkali treatment had an inhibitory effect on plant growth and biomass accumulation,while the damage index and cell membrane permeability showed a time-dependent tendency and were modified in an acid and alkali-dependent manner.As the treatment continued,the content of free proline showed a tendency of continuously increasing,while the content of chlorophyll and soluble sugar and the activity of antioxidant enzyme rose up first and then fell down.The acid and alkali treatment had an inhibitory effect on the antioxidant enzyme activity,and exerted influence on the accumulation of soluble sugar and free proline.In conclusion,S.tetragona modified the content of osmotic regulator and antioxidant enzyme activity to adapt to acid and alkali environment.