A hydroponic experiment combined with subeellular fractionation and gel filtration was carried out to study the chemical forms and subcellular and molecular distribution of Cd in rice roots and leaves, and to compare the differences between the rice varieties ' Guangyuanzhan No. 3' ( a low-Cd accumulation genotype) and ' Zhenguiai' (a high-Cd accumulation genotype). The results showed that with increasing concentration of Cd in the medium, the Cd content in all fractions of rice roots and leaves increased significantly, and most of Cd a...