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Polystyrene Nanoplastics Impair Transcriptional Resilience to Salt Stress in Rice
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Scientists found that tiny plastic particles (nanoplastics) make it much harder for rice plants to recover from salt stress, even after the stress is removed. The plastic particles disrupt the plants' ability to turn the right genes on and off, preventing them from bouncing back to normal growth. This matters because nanoplastics are increasingly found in our food system, and this research suggests they could harm crop resilience and potentially affect the nutritional quality of foods we eat.
Nanoplastics (NPs) and salinity increasingly co-occur in agricultural systems. Here, we investigated how polystyrene NPs (502 nm, 10 mg L-1) impair rice (Oryza sativa L.) recovery from salt (50 mM NaCl). During stress, NPs synergistically amplified ionic toxicity, elevating Na+/K+ ratios 48% above additive predictions. Crucially, this synergism intensified to 60% during recovery, preventing homeostasis restoration. Transcriptomic analysis revealed that NP-salt interactions shifted from additive to antagonistic poststress, disrupting trehalose pathway regulation critical for osmotic adjustment. Additionally, coexposed plants failed to switch from stress- to growth-associated gene modules, exhibiting 34% fewer differentially expressed genes than salt-only plants. These findings demonstrate that NPs compromise transcriptional resilience by disrupting adaptive reprogramming, emphasizing the need for recovery-inclusive risk assessments.
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Molecular mechanisms of toxicity and detoxification in rice (Oryza sativa L.) exposed to polystyrene nanoplastics
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Researchers studied how polystyrene nanoplastics affect rice seedlings at the molecular level. They found that nanoplastic exposure significantly reduced root and shoot growth by over 50%, while triggering oxidative stress and activating genes related to both toxicity and defense responses. The study provides new insights into how crop plants respond to nanoplastic contamination at the genetic and physiological level.
Polystyrene Nanoplastics Affect the Expression of Genes Involved in Cellular Processes in Arabidopsis thaliana (L.)
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Scientists found that tiny plastic particles (from broken-down polystyrene, like Styrofoam) can mess with a plant's genes—shutting down ones needed for growth, stress defense, and detoxification. While this study was done in a lab plant (not food crops) and doesn't directly test human health effects, it raises a flag: if nanoplastics can disrupt basic plant biology, they may also affect the crops we eat, which is worth watching given how much plastic pollution has spread into soil and water.
Size-dependent effects of polystyrene micro- and nanoplastics on the quality of rice grains and the metabolism mechanism
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Researchers found that tiny polystyrene plastic particles (under 100 nanometers) were absorbed by rice roots and traveled up into the grain, reducing protein content by up to 29%. The smallest particles weakened the plant's natural defenses by disrupting sugar metabolism. This means microplastics in soil could be silently lowering the nutritional quality of rice that people eat.
Polystyrene Nanoplastics Affect the Expression of Genes Involved in Cellular Processes in Arabidopsis thaliana (L.)
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Scientists exposed a common lab plant to tiny plastic particles (nanoplastics) and found they disrupted genes controlling cell growth, stress responses, and the plant's ability to defend itself and remove toxins. While this study was done in plants, not humans, it adds to growing evidence that nanoplastics—now found in our air, water, and food—can interfere with basic biological processes at the cellular level, raising questions about their potential effects on the crops we eat and, ultimately, our own health.
Response of rice (Oryza sativa L.) roots to nanoplastic treatment at seedling stage
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Researchers exposed rice seedlings to polystyrene nanoplastics and found that the particles were taken up by the roots, aided by water-transporting proteins in the plant. The nanoplastics triggered oxidative stress, reduced root length, and disrupted carbon metabolism and hormone production in the seedlings. The study raises concerns that nanoplastic contamination in agricultural soils could affect crop growth and potentially enter the human food supply through rice consumption.
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