Effects of cadmium stress on dimorphic seedling growth and the stress-resistance physiology of Suaeda salsa
The adaptation strategy and response mechanism of Suaeda salsa dimorphic seedlings under Cd stress were explored,and the seed type with the greater potential to repair Cd-polluted saline soil was selected.Seedling growth,Cd accumulation in different organs,antioxidant enzyme activity,and osmotic regulator contents were examined by soil culturing S.salsa in the Liaohe Estuary wetlands with 0,0.04,0.2,0.4 mg·kg-1,and 0.8 mg·kg-1 Cd.The results were as follows.The plant height and fresh weight of black seedlings were reduced compared to those of brown seedlings,and the root,stem,and leaf biomasses of brown seedlings were larger than those of black seedlings.The antioxidative responses of SOD,POD,and CAT in brown seedlings were stronger than those in black seedlings.The osmotic regulator content increased significantly,and the soluble sugar and proline contents in brown seedlings were significantly higher than those in black seedlings.The Cd accumulation of brown seedlings was higher than that of black seedlings,and its distribution in different organs was root>leaf>stem.Cd accumulation and osmotic regulator content were positively correlated(P<0.01),as well as plant growth and antioxidant enzyme activity(P<0.05).In conclusion,brown seedlings showed stronger Cd tolerance and better ability to repair Cd-polluted saline soil than black seedlings.
万方数据
维普
