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Cadmium accumulation characteristics and removal potentials of high cadmium accumulating rice line grown in cadmium-contaminated soils

Tang, Hao, Li, Tingxuan, Yu, Haiying, Zhang, Xizhou
Environmental science and pollution research international 2016 v.23 no.15 pp. 15351-15357
Oryza sativa, cadmium, phytoremediation, phytotoxicity, polluted soils, rice, shoots
Phytoextraction is a promising technique to remove cadmium (Cd) from contaminated soils. In this research, the two different Cd accumulation rice lines of Lu527-8 (the high Cd accumulating rice line) and Lu527-4 (the normal rice line) were grown in soils with different Cd treatments (0, 5, 10, and 20 mg kg⁻¹ soil) to evaluate Cd accumulation characteristics and Cd removal potentials. When the concentration of Cd in soil increased, Lu527-8 showed less symptoms of phytotoxicity when compared to Lu527-4. Furthermore, Lu527-8 demonstrated greater shoot Cd accumulation (321.17–964.95 mg plant⁻¹) than Lu527-4 (50.37–201.66 μg plant⁻¹) at the jointing and filling stages. The soil available Cd content of Lu527-8 significantly decreased by 26.92–38.97 and 27.77–63.44 % at the jointing and filling stages, respectively. Meanwhile, the total Cd content in soil also reduced by 11.64–46.75 and 21.41–54.11 % at jointing and filling stages, respectively. When the Cd concentration in soil was 20 mg kg⁻¹, the Cd extraction rate in shoots of Lu527-8 reached 2.12 and 2.85 % which increased 10.60 and 6.48 times compared with that of Lu527-4 at the jointing and filling stages, respectively. In conclusion, this study demonstrates that Lu527-8 shows great abilities of Cd accumulation and Cd removal potential from contaminated soils with different Cd treatments and it is a promising species for phytoextraction of Cd-contaminated soils.