数字农科院2.0

Microplastic Particles Increase Arsenic Toxicity To Rice Seedlings

文献类型： 外文期刊

作者： Dong, YM; Gao, ML; Song, ZG; Qiu, WW

作者机构：

关键词： Biomass; Antioxidant Enzymes; Rubisco Activity; Physiological Activity; Mechanisms

期刊名称： ENVIRONMENTAL POLLUTION

ISSN： 0269-7491

年卷期： 2020 年 259 卷

页码：

收录情况： JCR（2021版） ; EI（2021版）

摘要： Hydroponic experiments were conducted to study the effects of microplastic particles of polystyrene (PS) and polytetrafluoroethylene (PTFE) on arsenic (As) content in leaves and roots of rice seedlings, and the changes in root vigor and physiological and biochemical indicators under single or combined PS and PTFE with As(III) treatment. Rice biomass decreased with increasing concentrations of PS, PTFE, and As(III) in the growth medium. The highest root (leaf) biomass decreases were 21.4% (10.2%), 25.4% (11.8%), and 26.2% (16.2%) with the addition of 0.2 g L-1 PS, 0.2 g L-1 PTFE, and 4 mg L-1 As(III), respectively. Microplastic particles and As(III) inhibited biomass accumulation by inhibiting root activity and RuBisCO activity, respectively. The addition of As(III) and microplastic particles (PS or PTFE) inhibited photosynthesis through non-stomatal and stomatal factors, respectively; furthermore, net photosynthetic rate, chlorophyll fluorescence, and the Chl a content of rice were reduced with the addition of As(III) and microplastic particles (PS or PTFE). Microplastic particles and As(III) induced an oxidative burst in rice tissues through mechanical damage and destruction of the tertiary structure of antioxidant enzymes, respectively, thereby increasing O-(2) over bar and H2O2 in roots and leaves, inducing lipid peroxidation, and destroying cell membranes. When PS and PTFE were added at 0.04 and 0.1 g L-1, respectively, the negative effects of As(III) on rice were reduced. Treatment with 0.2 g L-1 PS or PTFE, combined with As(III), had a higher impact on rice than the application of As(III) alone. PS and PTFE reduced As(III) uptake, and absorbed As decreased with the increasing concentration of microparticles. The underlying mechanisms for these effects may involve direct adsorption of As, competition between As and microplastic particles for adsorption sites on the root surface, and inhibition of root activity by microplastic particles. (C) 2019 Elsevier Ltd. All rights reserved.

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