Effects of cadmium on uptake, subcellular distribution and chemical form of zinc in Arabis paniculata Franch.

Using the differential centrifugation technique and sequential chemical extraction method, effects of Cd on subcellular distribution and chemical form of Zn in multi-metal hyperaccumulator Arabis paniculata Franch under nutrient solution culture were analyzed. Results show that the biomass of A. paniculata has no significant variance increased between before transplant and with Zn/Cd treated 21 days(p>0.05). The cadmium in the nutrient solution has no obvious influence on Zn absorption. NaCl-, ethanol-, water-, HAc-extractable Zn are the predominant fractions in leaves of the plant, NaCl-, ethanol-extractable Zn are predominat fractions in root. Other chemical forms are very low in content. Zn is mainly distributed in cell wall and in karyon which suggests that cell wall and karyon in the plant are major storage for Zn. The cadmium in the nutrient solution has heightened the percentage of Zn in the cell wall and promoted the transportation of Zn to the cell wall, but it has no obvious influence on subcellular distribution and chemical form of Zn in A. paniculata Franch.