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Impact of polypropylene microplastics and lead on wheat germination and seedling growth
Summary
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.