We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Size- and charge-dependent phytotoxicity of polystyrene nanoplastics to Vallisneria natans
AI summary Read the abstract
Scientists found that tiny plastic particles (nanoplastics) harm underwater plants, and the smallest, positively-charged particles caused the most damage—stunting growth, disrupting photosynthesis, and even lodging inside plant roots. This matters because these plants are a key part of freshwater ecosystems, and their decline could ripple through waterways that eventually connect to our drinking water and food supply, adding to growing evidence that plastic pollution affects life at every level, from plants to potentially humans.
The pervasive contamination of nanoplastics (NPs) in aquatic ecosystems has raised significant ecological concerns, yet their size- and charge-dependent effects on submerged macrophytes remain poorly understood. This study systematically investigated the phytotoxicity of polystyrene nanoplastics (PS-NPs) with different sizes (30 nm and 300 nm) and surface functional groups (-NH and -COOH) on Vallisneria natans (V. natans) for a 30-day exposure period. Results showed that all PS-NPs treatments inhibited plant growth and reduced photosynthetic pigment content, with the 30 nm PS-NH group exhibiting the most pronounced toxicity. Specifically, 30 nm PS-NH exposure led to a 29.5% reduction in biomass compared to the control group and a significant decline in maximum photochemical efficiency (Fv/Fm), non-photochemical quenching (NPQ), and photochemical quenching (qP), indicating severe impairment of Photosystem II. Microscopic observations via SEM and TEM revealed that PS-NPs formed "particle-microbe complexes" on leaf surfaces and that 30 nm particles effectively translocated into root vascular bundles, inducing chloroplast deformation and starch granule accumulation. Furthermore, PS-NPs stress triggered an oxidative burst, evidenced by elevated HO and MDA levels despite the activation of antioxidant enzymes (SOD, CAT, POD, and APX). 16S rDNA sequencing further demonstrated that PS-NPs markedly restructured the epiphytic bacterial community, altering the ecological balance of leaf-associated microorganisms. Collectively, this study highlights that smaller and positively charged PS-NPs pose the greatest risk to submerged macrophytes, driving physiological impairment and microecological shifts. These findings provide critical insights into the biological impacts and environmental risks of PS-NPs in freshwater ecosystems.
More Papers Like This
Physiological Responses and Absorption Removal Effects of Three Floating Macrophytes to Polystyrene Nanoplastics Pollution
AI summary Read the abstract
Scientists found that tiny plastic particles (nanoplastics) harm floating water plants, damaging their cells and forcing them to work harder to survive. Some plant species also absorbed and stored more plastic than others. This matters because these plants grow in waterways that can feed into our water supply, so understanding how they interact with plastic pollution helps researchers figure out how nanoplastics move through ecosystems, and potentially toward us.
Effects of microplastics/nanoplastics on Vallisneria natans roots and sediment: Size effect, enzymology, and microbial communities
AI summary Read the abstract
This study compared how polystyrene micro- and nanoplastics of three different sizes (20 nm, 200 nm, and 2 µm) affected the aquatic plant Vallisneria natans and surrounding sediment. Smaller particles adhered more readily to roots and altered root growth, while larger particles caused greater oxidative stress. All sizes disrupted sediment enzyme activity and shifted microbial communities on root surfaces, reducing beneficial bacteria like Proteobacteria. The findings show that particle size is a key variable in predicting microplastic harm to aquatic plant ecosystems.
Toxicity of polystyrene nanoplastic variants to cyanobacteria: Evidence from algal growth, physiology and transcriptomics
AI summary Read the abstract
Scientists found that nanoplastics with a positive electrical charge are far more harmful to algae than neutral or negatively charged ones, damaging the algae's ability to photosynthesize and produce energy. This matters because these algae form the base of aquatic food webs, so widespread plastic pollution with certain surface charges could ripple through ecosystems—and ultimately affect the water and seafood we depend on.
Phytotoxic Mechanisms of Polystyrene Microplastics in Myriophyllum spicatum Under Saline Conditions: Insights from Physiology, Transcriptomics, and Phyllosphere Microbiota
AI summary Read the abstract
Scientists found that microplastic pollution affects underwater plants differently depending on how much is present: small amounts actually helped a water plant grow better, while larger amounts damaged its cells and hurt its ability to filter nutrients from water. This matters because these plants play a key role in keeping lakes, rivers, and coastal waters clean — and as microplastic pollution increases in salty and brackish waters worldwide, this research suggests it could weaken the natural water-filtering systems we rely on for healthy aquatic ecosystems and, ultimately, cleaner water supplies.
ElectrostaticAdsorption-Driven Reorganization ofPhycosphere Eco-Corona as a Toxicity Mechanism of Cationic Nanoplastics
AI summary Read the abstract
Scientists found that tiny plastic particles (nanoplastics) can harm freshwater algae very differently depending on their electrical charge: positively charged particles caused major cell damage, oxidative stress, and killed up to nearly 90% of algae cells, while negatively charged particles were much less harmful. Since algae sit at the base of aquatic food chains, this matters because it suggests the type of plastic pollution—not just its presence—could shape how much damage spreads through ecosystems and, potentially, up the food chain to humans who rely on these waters for food and drinking supplies.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.