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Impact of polypropylene microplastics and lead on wheat germination and seedling growth
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Scientists found that tiny plastic particles (microplastics) and lead, alone or together, can stunt wheat seedling growth and stress the plants, and surprisingly, bigger plastic pieces caused more harm than smaller ones. Since wheat is a staple crop worldwide, this research raises questions about whether soil pollution from plastics and heavy metals could affect crop yields and the food we eat, though more research is needed to know exactly how this translates to human health.
This study examines the effects of polypropylene microplastics (PP-MPs) and lead (Pb) on wheat seed germination, seedling growth, and antioxidant responses under hydroponic conditions. We evaluated the impacts of two PP-MP sizes (6.5 μm and 13 μm) and a Pb concentration of 5 mg/L on seedling development. Results show that PP-MPs inhibited seed germination, with larger particles being more toxic. Pb alone had mild effects, but when combined with PP-MPs, particularly larger ones, it worsened seedling growth. Interestingly, Pb reduced the toxicity of smaller PP-MPs. Both pollutants induced oxidative stress, with larger PP-MPs and higher Pb concentrations intensifying damage. This highlights the complex interactions between microplastics and heavy metals in plants, underlining the need for further research into their long-term agricultural impacts.
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An analysis of impact of soil co-pollution with lead and traditional/biodegradable microplastics on growth characteristics of maize (Zea mays L.)
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Scientists found that when common plastic pollution (from plastic bags/packaging) mixes with lead in soil, it makes corn plants absorb even more lead into their roots, stems, and leaves while also stunting their growth. Interestingly, a plant-based biodegradable plastic caused fewer of these problems and even helped some beneficial soil processes. This matters because lead-contaminated crops can pose health risks to people who eat them, and it suggests that the type of plastic polluting our farmland could make heavy metal contamination in food crops worse or better.
Impact of Microplastic Contamination in Compost on Wheat Crop Growth: A Study of Bread and Durum Wheat Varieties
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Researchers inventoried microplastic content in commercially available compost and then exposed bread and durum wheat varieties to MP-contaminated growing conditions, measuring the effects on crop growth and raising concerns about microplastic transfer into the human food supply via agriculture.
Evidence of Soil Microplastics Inhibiting the Germination of Commercial Coriander Seeds Under Field Conditions
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Field and greenhouse experiments showed that virgin polypropylene, PVC, and polylactic acid microplastics at concentrations as low as 0.05% w/w inhibited coriander seed germination by 60–100% within the first seven days, with PVC causing the greatest inhibition and all polymers inducing oxidative stress in root tips. These results indicate that even unaged microplastics pose direct phytotoxic risks in agricultural soils, threatening crop yields and food security independent of chemical additive leaching.
Impact of Microplastics on Plant Growth
Impact of Microplastics and Nanoplastics on Plant Health and Development
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Researchers review the emerging evidence on how microplastics accumulate in agricultural soils and affect plant health and development, highlighting that while aquatic impacts are well documented, the effects on terrestrial food crops and soil-plant systems remain poorly understood.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.