›› 2020, Vol. 32 ›› Issue (6): 963-970.DOI: 10.3969/j.issn.1004-1524.2020.06.03

• Crop Science • Previous Articles     Next Articles

Effects of iron plaque in root surface on cadmium uptake of rice

GU Jiancheng1,2, GUO Bin2, LIN Yicheng2, FU Qinglin2,*, LIU Chen2, DING Nengfei2, LI Hua2, LI Ningyu2   

  1. 1. School of Environment and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China;
    2. Institute of Environment, Resources, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
  • Received:2019-11-25 Online:2020-06-25 Published:2020-06-24

Abstract: In order to elucidate the effect of the iron plaque on cadmium (Cd) uptake of rice, the Cd low-accumulation variety (Bing 0203) and high-accumulation variety (Shaonuo 16-72) were screened out of 8 test rice varieties first. Then, a series of hydroponic experiments were conducted to test the changes of root activity (root exudates), iron plaque formation, Cd content in iron plaque, and Cd uptake in different parts of rice. It was shown that the total Cd uptake of Shaonuo 16-72 was 1.73 times of Bing 0203 under 0.05 mg·L-1 Cd treatment after 24 h, and the Cd contents in roots, stems and leaves of Shaonuo 16-72 were significantly (P<0.05) higher than those of Bing 0203, respectively. On this basis, exogenous iron addition significantly (P<0.05) decreased Cd accumulation of Shaonuo 16-72 to 59% of Bing 0203. Accordingly, the Cd contents in roots, stems and leaves of Shaonuo 16-72 were significantly (P<0.05) lower than those of Bing 0203. Temperature experiments (100 ℃, 4 ℃ and 25 ℃) showed that the formation of iron plaque was related to the activity of rice root (root exudates). The contents of root exudates and iron plaque in Shaonuo 16-72 was significantly (P<0.05) higher than those of Bing 0203 at 25 ℃. Exogenous iron and Cd addition significantly (P<0.05) increased the root activity, iron plaque content and Cd content in iron plaque of Shaonuo 16-72, and the increase of these indexes in Shaonuo 16-72 was higher than that in Bing 0203. In conclusion, iron plaque formation restrained Cd uptake in rice, which provided theoretical basis for the prevention of Cd uptake in rice by iron application.

Key words: rice, root activity, iron plaque in root surface, cadmium uptake

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