Impact of polyethylene and polylactic acid microplastics on growth, physio-biochemistry and metabolism in soybean (Glycine max)
LIAN Yu-hang, LIU Wei-tao, SHI Rui-ying, WANG Qi, LI Jian-tao, ZHENG Ze-qi
Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
Abstract：The influence of bio (polylactic acid) and non-biodegradable (polyethylene) at two different concentrations (0.1%, 1%,W/W) on the growth, photosynthesis, oxidation resistance, nutritional quality, and metabolism of soybean (Glycine max) were deeply studied to reveal the ecotoxicological impact of microplastics with different biodegradability on crops. Results revealed that polyethylene microplastics (PEMPs) tend to increase the fresh weight of Glycine max roots. The treatment of 0.1% Polylactic acid microplastics (PLAMPs) inhibited the root length. Whereas, PEMPs enhanced the chlorophyll content of Glycine max significantly. The catalase (CAT) activity was decreased under PLAMPs, while the hydrogen peroxide (H2O2) content was increased by 0.1% PEMPs and 1% PLAMPs exposure. In addition, the Mn, Fe, and Cu content of Glycine max roots also changed, which had the most obvious impact with 0.1% PEMPs. Furthermore, the amino acid metabolisms in Glycine max were up regulated under PEMPs, while organic acid and sugar metabolisms were down regulated under 0.1% PLAMPs. Overall, the phytotoxicity of microplastics is closely related to their biodegradability and concentrations. Biodegradable microplastics at lower doses had the most profound effect on Glycine max. These findings are expected to provide new insights into the effects of microplastics on crop plants in the future.
廉宇航, 刘维涛, 史瑞滢, 王琦, 李剑涛, 郑泽其. 聚乙烯和聚乳酸微塑料对大豆生长和生理生化及代谢的影响[J]. 中国环境科学, 2022, 42(6): 2894-2903.
LIAN Yu-hang, LIU Wei-tao, SHI Rui-ying, WANG Qi, LI Jian-tao, ZHENG Ze-qi. Impact of polyethylene and polylactic acid microplastics on growth, physio-biochemistry and metabolism in soybean (Glycine max). CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(6): 2894-2903.
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