| Field experiment was conducted to investigate the accumulation characteristics and dynamic distribution of Cd in ten genotypes of rice. The results showed that the distribution of Cd in various rice plant parts was in the order：root>leaf and stem >husk>brown rice. The concentrations of Cd in roots of conventional rice were the lowest at seeding stage, and the highest at tillering stage, while of Cd in root of hybrid rice with growth cycle less than 120 days and over 120 days were the highest at tillering stage and mature stage, respectively. The tendency of Cd concentration in leaf and shoot of rice increased firstly, decreased, and then increased to a peak at mature stage. In the present study, the contents of Cd in brown rice samples（Xiang Zao-xian 42 and T-you 705） were relatively low among conventional rice and hybrid rice, while the ranges of concentrations of Cd in brown rice（0.21~1.53 mg·kg-1） were closed to, even beyond the limit of the food health standard（0.2 mg·kg-1）. |
