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Impact of microplastics on the foraging, photosynthesis and digestive systems of submerged carnivorous macrophytes under low and high nutrient concentrations
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Researchers investigated how polystyrene microplastics affect the carnivorous aquatic plant Utricularia vulgaris, finding that high concentrations reduced growth, photosynthesis, and chlorophyll content while increasing oxidative stress. The study also revealed that microplastics accumulated in the plant's traps and altered the associated microbial community, though higher nutrient levels helped compensate for some of the negative growth effects.
The prevalence of microplastics in marine, terrestrial, and freshwater habitats has raised concerns about their availability and risks to organisms. However, the effects of plastic debris on aquatic plants remain largely unknown and have hardly been studied, despite the importance of these plants in freshwater ecosystems. In this study, we exposed the aquatic carnivorous plant Utricularia vulgaris to polystyrene microplastics (10 and 80 mg/L) combined with different nutrient concentrations and then assessed their effects on the growth rate, photosynthesis, oxidative stress, and trap-associated microbial community of U. vulgaris. The impact of microplastic accumulation in the traps (or "bladders") of U. vulgaris was investigated using confocal microscopy. The results showed that the relative growth rate, shoot length, chlorophyll content, Fv/Fm, and ascorbate peroxidase enzyme activity of U. vulgaris decreased in 80 mg/L microplastics, whereas the superoxide dismutase and peroxidase enzyme activities increased significantly. The presence of microplastics led to higher malondialdehyde and hydrogen peroxide contents. However, high nutrient concentrations can compensate for the reduced growth performance of U. vulgaris in microplastic-exposure treatments. The microplastic treatments significantly altered the trap-associated microbial community structure and diversity. The results of this study revealed that beside adsorption, carnivorous plants can accumulate microplastics in their digestive organs.
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Researchers exposed the aquatic carnivorous plant Utricularia vulgaris to polystyrene microplastics of different sizes and concentrations for seven days. The study found that microplastic exposure affected plant growth rate and caused morphological and physiological changes, providing early evidence that freshwater plants can be negatively impacted by microplastic pollution.
Bladder entrance of microplastic likely induces toxic effects in carnivorous macrophyte Utricularia aurea Lour
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The carnivorous aquatic plant Utricularia aurea took up PVC microplastics through its suction trap bladders, and this internal uptake caused significant reductions in growth, chlorophyll content, and photosynthetic function. Polyethylene particles, which were too large for the bladder openings, caused no such effects, showing that particle size and plant anatomy determine toxicity.
Negative impacts of nanoplastics on the purification function of submerged plants in constructed wetlands: Responses of oxidative stress and metabolic processes
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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.
Unraveling the toxic mechanisms of microplastics in aquatic ecosystem: A case study on Vallisneria natans and Myriophyllum verticillatum
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Researchers exposed two submerged aquatic plant species (Vallisneria natans and Myriophyllum verticillatum) to PVC, polystyrene, and polyethylene microplastics at three concentrations, finding that all three types significantly inhibited photosynthesis and growth and triggered oxidative stress, with effects varying by plastic type and plant species.
Toxicity mechanism of microplastics on the growth traits and metabolic pathways of Vallisneria natans under different light environments
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Researchers examined how microplastics affect the aquatic plant Vallisneria natans under different light conditions and found that strong light significantly increased microplastic accumulation on leaves and roots. The combination of high light and microplastics caused the most severe disruption to photosynthesis, energy metabolism, and triggered elevated oxidative stress. The findings suggest that environmental conditions like light intensity can amplify the harmful effects of microplastic pollution on freshwater plants.
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