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Negative impacts of nanoplastics on the purification function of submerged plants in constructed wetlands: Responses of oxidative stress and metabolic processes

Water Research 2022 75 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 55 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

Hongwei Yu, Hongwei Yu, Yang Liu, Yang Liu, Yang Liu, Hongwei Yu, Hongwei Yu, Yang Liu, Hongwei Yu, Yang Liu, Yang Liu, Hongwei Yu, Yang Liu, Jiuhui Qu Jiuhui Qu Yang Liu, Yang Liu, Yang Liu, Hongwei Yu, Yang Liu, Lichao Wei, Hongwei Yu, Hongwei Yu, Hongwei Yu, Hongwei Yu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Yang Liu, Jianfeng Peng, Lichao Wei, Xiaofeng Cao, Yang Liu, Yang Liu, Hongwei Yu, Yang Liu, Jianfeng Peng, Yang Liu, Huijuan Liu, Xiaofeng Cao, Yang Liu, Xiaofeng Cao, Xiaofeng Cao, Xiaofeng Cao, Jianfeng Peng, Xiaofeng Cao, Huijuan Liu, Yang Liu, Yang Liu, Hongwei Yu, Huijuan Liu, Hongwei Yu, Jianfeng Peng, Yang Liu, Hongwei Yu, Huijuan Liu, Yang Liu, Hongwei Yu, Huijuan Liu, Huijuan Liu, Huijuan Liu, Jiuhui Qu Jiuhui Qu Jiuhui Qu Jianfeng Peng, Jianfeng Peng, Jiuhui Qu Jiuhui Qu Jiuhui Qu Huijuan Liu, Jiuhui Qu Xiaofeng Cao, Hongwei Yu, Yang Liu, Yang Liu, Huijuan Liu, Huijuan Liu, Yang Liu, Jianfeng Peng, Yang Liu, Jiuhui Qu Jiuhui Qu Yang Liu, Yang Liu, Yang Liu, Jiuhui Qu Jiuhui Qu Jiuhui Qu Jianfeng Peng, Jiuhui Qu Jiuhui Qu Jiuhui Qu Huijuan Liu, Jiuhui Qu Jiuhui Qu Jiuhui Qu Jiuhui Qu Jiuhui Qu Jiuhui Qu

Summary

Researchers exposed a submerged aquatic plant commonly used in constructed wetlands to polystyrene nanoplastics and measured the impacts on growth, photosynthesis, and metabolism. They found that nanoplastics were absorbed and transported throughout the plant, reducing growth by up to 73 percent and disrupting key metabolic pathways including the citric acid cycle. The study suggests that nanoplastic accumulation in wetland plants could compromise their ability to purify water.

Polymers

Constructed wetlands (CWs) are an important barrier to prevent nanoplastics (NPs) and microplastics (MPs) from entering receiving streams. However, little is known about how the accumulation of NPs affects the growth, photosynthesis, oxidative stress responses, and metabolism of plants, especially submerged plants that are widely used in CWs for water purification. Herein, we adopted Utricularia vulgaris (U. vulgaris), a typical submerged macrophyte as the model plant to address the above knowledge gaps under exposure to polystyrene NPs (PS-NPs, 500 nm, 0∼10 mg·L). Results showed that PS-NPs were absorbed by insect traps and further transported to stems and leaves of U. vulgaris, which limited plant height (6.8∼72.9%), relative growth rate (7.4∼17.2%), and photosynthesis (3.7∼28.2%). U. vulgaris suffered from oxidative stresses, as evidenced by the increase in malondialdehyde, antioxidant enzymes (catalase, peroxidase, and superoxide dismutase), and HO, especially under 1 and 10 mg·L. Abundances of 548 metabolites were quantified, and 291 metabolites were detected with altered levels after exposure, in which 25∼34% metabolites were up-regulated, and 32∼40% metabolites were down-regulated in metabolite expression. Metabolic pathways of the tricarboxylic acid cycle and amino acid were disrupted, in which citric acid, threonine, and adenine decreased, while amino acids (like serine, phenylalanine, histidine, etc.) increased first and then decreased with increasing PS-NPs concentrations. Moreover, PS-NPs reduced the removal efficiency of total nitrogen and phosphorus from water by U. vulgaris, bringing potential risks to aquatic ecosystems. These findings have greatly enhanced our understanding of the metabolic mechanisms and interactions of aquatic macrophytes that are heavily used in CWs in response to NPs stress, as well as the impact of NPs on CWs functioning.

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