Impact of Titanium Dioxide Nanoparticles on Cd Phytotoxicity and Bioaccumulation in Rice ( Oryza sativa L.)

Wei Zhang, Jinghua Long, Jianmin Geng, Jie Li and Zhongyi Wei
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Wei Zhang: School of Public Administration, Hebei University of Economics and Business, Shijiazhuang 050061, China
Jinghua Long: School of Public Administration, Hebei University of Economics and Business, Shijiazhuang 050061, China
Jianmin Geng: College of Mathematics and Statistics, Hebei University of Economics and Business, Shijiazhuang 050061, China
Jie Li: College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China
Zhongyi Wei: College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China

IJERPH, 2020, vol. 17, issue 9, 1-14

Abstract: The impact of engineered nanoparticles (ENPs) on the migration and toxicity of coexisting pollutants is still unclear, especially in soil media. This study aims to evaluate the impact of titanium dioxide nanoparticles (TiO 2 NPs) on the phytotoxicity of cadmium (Cd) to Oryza sativa L., and the migration of cadmium (Cd) in the soil-rice system. Three different Cd stress groups (C1 group: 1.0 mg kg −1 , C2 group: 2.5 mg kg −1 and C3 group: 5.0 mg kg −1 ) were set in the pot experiment, and the target concentration of TiO 2 NPs in each group were 0 mg kg −1 (T0), 50 mg kg −1 (T1), 100 mg kg −1 (T2) and 500 mg kg −1 (T3). Plant height and biomass decreased with the increasing of Cd content in paddy soil. TiO 2 NPs could lower the phytotoxicity of Cd in terms of the changes in the morphological and biochemical characteristics, especially in the tillering and booting stage. In the tillering stage, TiO 2 NPs addition caused a significant increase in plant height, biomass and the total chlorophyll content in the leaves of Oryza saliva L. In the booting stage, TiO 2 NPs addition caused a 15% to 32% and 24% to 48% reduction of malondialdehyde (MDA) content for the C2 and C3 group, respectively, compared to that of the respective control treatment (T0). TiO 2 -NPs addition reduced the activity of peroxidase (POD) in the leaves in the booting and heading stage, and the activity of catalase (CAT) in the tillering stage. In the C1 and C2 group, the grain Cd content in the 100 and 500 mg kg −1 TiO 2 NPs treatments reached 0.47–0.84 mg kg −1 , obviously higher than that of the treatment without TiO 2 NPs (0.27–0.32 mg kg −1 ), suggesting that TiO 2 -NPs could promote Cd migration in the soil-rice system.

Keywords: titanium dioxide nanoparticle; cadmium; bioaccumulation; rice (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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