Study on The Mechanism of Cd Absorption in Roots of Suaeda Heteroptera

Abstract

Abstract In this paper, Suaeda heteroptera Kitag., a dominant plant in the wetland of northern China, was studied. The hydroponic experiment was carried out, the content of Cd in the roots of S. heteroptera after adding ion channel inhibitors and metabolic inhibitors, and the subcellular distribution and chemical morphology of Cd in S. heteroptera were determined. The results showed that the absorption of heavy metal Cd by roots of S. heteroptera was closely related to calcium and potassium channels. Compared with potassium channels, the absorption of heavy metal Cd by roots of S. heteroptera mainly went through calcium ion channels, and the type of ion channels in which heavy metals enter plants was closely related to the kinds of heavy metals and plant species. A P-type ATPase is capable of transporting Cd in the S. heteroptera root system, and the absorption of heavy metal Cd by the S. heteroptera root is closely related to the P-type ATPase. That is, the S.heteroptera root has an active absorption effect on the absorption of heavy metal Cd. Under hydroponic conditions, the subcellular distribution of heavy metal Cd in the S. heteroptera root system was mainly composed of cell walls and soluble components. The chemical forms of heavy metal Cd in the S. heteroptera root system were mainly extracted by sodium chloride and acetic acid.