Abstract: This work was designed to study the interaction effects of cadmium with iron, zinc on the growth of rice seedling and the cadmium absorption and translocation in the rice seedling. This study included two experiments, which both used the rice variety of Weiyou 46 and C-liangyou 266 under the hydroponic culture conditions. Experiment Ⅰ was designed to explore the cadmium concentration on the cadmium transportation in the rice seedling and included the treatments of 0.0, 0.1, 0.5, 1.0, 2.0 mg/kg Cd²⁺. Experiment Ⅱ was designed to explore the interaction of cadmium with iron, zinc on the growth of rice seedling and included the treatments of CK (1.0 mg/kg Cd²⁺), TFe (CK+5.0 mg/kg Fe²⁺) and TZn (CK+5.0 mg/kg Zn²⁺). Results of Experiment Ⅰ showed that the above-ground biomass weight and cadmium transport coefficient decreased in the roots of two varieties with the increasing of Cd²⁺ concentration, while the cadmium content and cadmium accumulation in the above-ground and roots, the roots cadmium uptake increased. There was a general trend that the above-ground biomass weight and cadmium content of Weiyou 46 were higher than that of C-liangyou266. Results of Experiment Ⅱ showed that applying Fe²⁺ significantly increased the above-ground biomass weight of C-liangyou 266 and decreased the root Cd content of Weiyou 46, but with insignificantly effect on the cadmium transport and Cd content in other parts of both rice varieties. This indicated that Fe²⁺ application would restrain the cadmium absorption in roots of Weiyou 46. Zn²⁺ treatment increased the above-ground biomass weight and Cd content in both rice varieties, while reducing the Cd content in root of Weiyou 46. This indicated that Zn²⁺ application would promote the transportation of Cd²⁺ from root to top, and inhibit Cd²⁺ uptake through inhibiting the development of rice roots. Therefore, adding Fe²⁺ and Zn²⁺ to soil can alleviate the toxic effects of cadmium on the rice growth.

Key words: Cadmium, Iron, Zinc, Rice

CLC Number: 

• S511.01