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Durum wheat under plastic pressure: genotype-specific adaptation to polystyrene nanoplastics
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Scientists found that tiny plastic particles (nanoplastics) in soil can stress durum wheat—the crop used to make pasta—but how much damage they cause depends on the wheat's genetics. One variety handled the plastic exposure well, keeping its nutrient levels and energy production stable, while another variety struggled with nutrient imbalances and cell damage. This matters because as plastic pollution builds up in farmland, it could affect crop nutrition and yields, meaning future food security may depend on breeding wheat varieties that can better withstand this contamination.
An emerging and underestimated threat to crop productivity and food safety stems from the increasing presence of nanoplastics, particularly polystyrene nanoplastics (PSNPs), in agricultural soils, a challenge further intensified by climate change. Although the phytotoxicity of NPs has been examined in several crop species, their impact on Triticum turgidum ssp. durum, a crop of significant nutritional importance and widespread in the semi-arid region, remains largely unexplored. In this study, we assessed the systemic effects of PSNP exposure (10 mg/L) on two durum wheat genotypes, Kronos (wild type) and MRP3 (a low-phytate mutant with altered root traits and micronutrient uptake), following plant development from seedling to grain filling. Through a combined phenotypic, physiological, ionomic, and transcriptomic approach, we identified clear genotype-dependent responses to PSNP-induced stress. Kronos showed a higher tolerance, maintaining nutrient homeostasis and sustaining photosynthetic activity, accompanied by a moderate transcriptional adjustment. In contrast, MRP3 exhibited substantial disruptions in ion balance, alongside intensified oxidative stress and extensive transcriptomic remodeling. Enrichment analyses revealed distinct molecular pathways underpinning each genotype's response, with Kronos activating photosynthesis- and defense-related pathways, while MRP3 triggered responses associated with nutrient deprivation, detoxification, and cell wall biosynthesis. Our findings demonstrate that PSNPs act as a significant abiotic stressor in durum wheat, eliciting genotype-dependent adaptive capacities. The contrasting responses highlight the critical role of transporter-mediated detoxification and nutrient homeostasis in shaping plant resilience to nanoplastic exposure. This study provides the first integrated molecular framework describing PSNP-induced stress responses in durum wheat and underscores the importance of genetic background in determining plant adaptive strategies to emerging environmental contaminants.
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This study found that polystyrene microplastics in soil significantly reduced wheat plants' ability to absorb nitrate, an essential nutrient for growth. The microplastics damaged roots and shut down key genes needed for nutrient uptake and processing. This matters because microplastic contamination in farmland could reduce crop yields and lower the nutritional quality of the food we grow.
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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.
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