Interactive Effect of Cadmiun,Zinc and Lead on Cadmiun,Zinc and Lead Accumulation in the Rice
Cadmium(Cd),zinc(Zn)and lead(Pb)always exist in the soil of their mining area.The effects of the interactions of Cd-Zn,Cd-Pb and Pb-Zn on plant growth and accumulation of metal elements in plants have been frequently reported.However,the interactive effects of Pb,Zn and Cd on plant growth and metal elements accumulation in plants is still unclear.Hence,we explored the interactive effects of Pb,Zn and Cd on rice growth and metal elements accumulation in plants through 3×3×3 factorial design with Cd,Zn,and Pb levels.The findings revealed that Cd stress sole significantly inhibited rice root elongation,Zn treatment sole increased rice biomass.100.4 μmol/L Zn treatment alleviated the inhibitory effect of Cd on root elongation of rice seedling.Cd-100 µmol/L Pb and 100 µmol/L Pb-10.4 μmol/L Zn promoted root elongation,while 100μmol/L Pb-100.4 μmol/L Zn inhibited root elongation.The concentrations of Cd,Zn and Pb in rice seedlings increased with the increase of the concentrations of Cd,Zn and Pb in nutrient solution,respectively.Cd-Zn had antagonistic effect on root Cd accumulation,whereas had significant synergistic effect on aboveground Cd accumulation,1 μmol/L Cd-10 µmol/L Pb had synergistic effect on root Pb accumulation,10 μmol/L Cd-10 μmol/L Pb had synergistic effect on Cd accumulation,and 10 μmol/L Cd-100 µmol/L Pb had antagonistic effect on Cd accumulation.Pb-Zn had synergistic effect on Pb accumulation,while had antagonistic effect on Zn accumulation in rice.Pb-Cd synergistically inhibited Zn accumulation in shoot.Cd-Pb-Zn synergistically promoted Pb accumulation in root.
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