Phytotoxic Effects of Polyethylene Microplastics on the Growth of Food Crops Soybean ( Glycine max ) and Mung Bean ( Vigna radiata )

Lin Wang, Yi Liu, Mandeep Kaur, Zhisheng Yao, Taizheng Chen and Ming Xu
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Lin Wang: Department of Environmental Science, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
Yi Liu: Department of Environmental Science, Miami College, Henan University, Kaifeng 475002, China
Mandeep Kaur: Department of Environmental Science, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
Zhisheng Yao: State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Taizheng Chen: Department of Environmental Science, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
Ming Xu: Department of Environmental Science, College of Geography and Environmental Science, Henan University, Kaifeng 475004, China

IJERPH, 2021, vol. 18, issue 20, 1-15

Abstract: Accumulation of micro-plastics (MPs) in the environment has resulted in various ecological and health concerns. Nowadays, however, studies are mainly focused on toxicity of MPs on aquatic organisms, but only a few studies assess the toxic effects of micro-plastics on terrestrial plants, especially edible agricultural crops. The present study was aimed to investigate the adverse effects of polyethylene (PE) microplastics on the germination of two common food crops of China, i.e., soybean ( Glycine max ) and mung bean ( Vigna radiata ). Both the crops were treated with polyethylene microplastics (PE-MPs) of two sizes (6.5 ?m and 13 ?m) with six different concentrations (0, 10, 50, 100, 200, and 500 mg/L). Parameters studied were (i) seed vigor (e.g., germination energy, germination index, vigor index, mean germination speed, germination rate); (ii) morphology (e.g., root length, shoot length) and (iii) dry weight. It was found that the phyto-toxicity of PE-MPs to soybean ( Glycine max ) was greater than that of mung bean ( Vigna radiata ). On the 3rd day, the dry weight of soybean was inhibited at different concentrations as compared to the control and the inhibition showed decline with the increase in the concentration of PE-MPs. After the 7th day, the root length of soybean was inhibited by PE-MPs of 13 ?m size, and the inhibition degree was positively correlated with the concentration, whereas the root length of mung bean was increased, and the promotion degree was positively correlated with the concentration. Present study indicated the necessity to explore the hazardous effects of different sizes of PE-MPs on the growth and germination process of agricultural crops. Additionally, our results can provide theoretical basis and data support for further investigation on the toxicity of PE-MPs to soybean and mung bean.

Keywords: micro-plastics particles; phyto-toxicity; agricultural crop; root length; seed vigor; seed germination (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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