Rare earth elements have been extensively used as micro-fertilizers for crops in China. To?understand the potential benefits or damages of Ce4+ on rice, the effects of Ce4+ on viability and membrane integrity of rice were investigated under hydroponic cultures. It has been found that the cell viability, electrical conductivity, pH changes, and concentration of malonyl dialdehyde did not change obviously when the content of Ce4+ was 0.5 mg/L, but varied markedly when the contents of Ce4+ were raised to 10 mg/L or more, indicating that the Ce4+ at higher concentrations severely affected the cell membrane permeability.
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