Microplastics (MPs) and heavy metals are common, often co-existing pollutants, that threaten crop growth and productivity worldwide. We analysed the adsorption of lead ions (Pb) to polylactic acid MPs (PLA-MPs) and their single factor and combined effects on tartary buckwheat (Fagopyrum tataricum L. Gaertn.) in hydroponics by measuring changes in the growth characteristics, antioxidant enzyme activities and Pb uptake of buckwheat in response to PLA-MPs and Pb. PLA-MPs adsorbed Pb, and the better fitting second-order adsorption model implied that Pb was adsorbed by chemisorption. However, the similar Pb contents in the plants treated with Pb only and those treated with the combined PLA-MPs-Pb suggested that the adsorption played no role in the uptake of Pb. Low concentrations of PLA-MPs promoted shoot length. At high concentrations of both PLA-MPs and Pb, buckwheat growth was inhibited, and leaf peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) activities and malondialdehyde (MDA) contents were higher than in the control. No significant differences were observed in seedling growth between exposure to Pb only and combined exposure to PLA-MPs with Pb, implying that PLA-MPs did not increase the toxicity of Pb at macroscopic level. POD activity was higher and chlorophyll content was lower with PLA-MPs in the low Pb dose treatments, suggesting that PLA-MPs may increase the toxicity of naturally occurring Pb. However, the conclusions must be verified in controlled experiments in natural soil conditions over the whole cultivation period of buckwheat.
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http://dx.doi.org/10.1016/j.chemosphere.2023.139356 | DOI Listing |
J Hazard Mater
January 2025
Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Electronic address:
The application of organic substances to the agricultural field has effectively enhanced soil nutrient levels and crop yields. Biodegradable microplastics (bio-MPs), a pervasive emerging contaminant, may potentially impact the soil ecosystem through their aging process. Here, a 150-day dark incubation experiment was conducted to elucidate the disparities in the aging process of polylactic acid bio-MPs (PLA-MPs) in soils with contrasting C/N ratios of organic substances, as the mechanisms underlying this process remain unclear.
View Article and Find Full Text PDFEcotoxicol Environ Saf
January 2025
College of Hydrology and Water Resources, Hohai University, Nanjing 210000, China. Electronic address:
The presence of biodegradable microplastics (BMPs) alongside toxic metals in soil significantly threatens plant health. Current research mainly focuses on the effects of original BMPs. In contrast, the specific impacts of ultraviolet (UV)-aged BMPs and their interaction with Cadmium (Cd) on seed germination and growth are unclear.
View Article and Find Full Text PDFEnviron Geochem Health
January 2025
School of Resources and Environment, Yili Normal University, Yining, 835000, China.
Soil microplastics (MPs) pollution has garnered considerable attention in recent years. The use of biodegradable plastics for mulching has led to significant quantities of plastic entering agro-ecosystems. However, the effects of biodegradable polylactic acid (PLA) plastics on meadow soils remain underexplored.
View Article and Find Full Text PDFPlants (Basel)
December 2024
School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China.
In order to reveal the effects of microplastics (MPs) on the growth and rhizosphere soil environmental effects of wheat ( L.), three microplastic types (polypropylene MPs (PP-MPs), high-density polyethylene MPs (HDPE-MPs), and polylactic acid MPs (PLA-MPs)), particle sizes (150, 1000, and 4000 μm), and concentrations (0.1, 0.
View Article and Find Full Text PDFToxics
December 2024
School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Sewage sludge is recognized as both a source and a reservoir for antibiotic resistance genes (ARGs). Within an anaerobic digestion (AD) system, the presence of microplastics (MPs) has been observed to potentially facilitate the proliferation of these ARGs. Understanding the influence of MPs on microbial behavior and horizontal gene transfer (HGT) within the AD system is crucial for effectively managing the dissemination of ARGs in the environment.
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