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Impact of Microplastics on Germination Index and Proline Content of Crop Plants
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Tiny plastic bits from pollution are seeping into farm soil, and this study found they can slow seed sprouting and stunt early growth in crops like peas and amaranth—with peas struggling more than amaranth. Since these crops end up on our plates, this research is an early warning sign that plastic pollution could eventually affect food supply and quality, reinforcing why cutting down on plastic waste matters for both the environment and what we eat.
Microplastics, defined as plastic particles smaller than 5 mm, have become widespread pollutants in various ecosystems due to the extensive use and improper disposal of plastic materials. These particles originate either from the degradation of larger plastic debris or from primary sources such as microbeads and synthetic fibers. While considerable attention has been given to microplastic pollution in marine environments, their infiltration into terrestrial agricultural ecosystems poses a serious threat to soil health and crop productivity. This study aimed to investigate the physiological and biochemical effects of microplastic contamination on crop plants, with particular emphasis on seed germination behaviour and proline content as indicators of stress. The investigation was carried out using two widely cultivated crop species: Pisum sativum (pea) and Amaranthus spp. (Amaranthus). Seeds were exposed to varying concentrations of microplastic particles (low, medium, and high doses) under controlled laboratory conditions for a period of 14 days. The germination index (GI), which integrates both germination percentage and germination speed, was calculated along with other growth parameters such as mean germination time, shoot length, and root length. In addition, proline a stress-related osmoprotectant involved in cellular osmoregulation and antioxidative defense was quantified using spectrophotometric analysis. The findings revealed that microplastic exposure adversely affected seed germination and early seedling development in both crop species, with the effects becoming more severe at higher concentrations. Among the two species, Amaranthus demonstrated greater resilience, exhibiting comparatively higher germination index values and lower proline accumulation than peas, indicating species-specific variations in tolerance to microplastic stress. This research provides valuable insights into the detrimental effects of microplastic pollution on agricultural crops during the earliest stages of plant development. The elevated proline levels observed under microplastic stress indicate oxidative and osmotic stress responses, highlighting proline as a useful biomarker for assessing plant health in contaminated soils. The outcomes of this study underscore the urgent need for effective waste management strategies and regulatory frameworks to reduce microplastic contamination and ensure sustainable agricultural productivity.
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Scientists found that plastic contamination in soil can harm pea plants early in their growth, potentially affecting how well crops develop. This matters because plastic waste is building up in farmland soil, not just oceans, and if it hurts the food crops we grow, tiny plastic particles could end up in our food supply and affect crop yields we depend on.
Polyethylene Microplastic-Induced Changes in Soil Properties Mediate Nutrient Accumulation and Growth of Amaranthus tricolor L.
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Scientists found that microplastic pollution in soil can stunt the growth of Amaranth (a leafy green vegetable), reduce its nutrient content, and harm beneficial soil bacteria — even at fairly low plastic concentrations. This matters because as plastic waste keeps building up in farmland, it could quietly shrink harvests and lower the nutritional quality of the vegetables we eat, making microplastic pollution a food security issue, not just an environmental one.
The Impact of Microplastic Concentration and Particle Size on the Germination and Seedling Growth of Pisum sativum L.
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Researchers tested the effects of polystyrene microplastics at different sizes and concentrations on pea seed germination and seedling growth in hydroponic experiments. They found that microplastics significantly harmed germination, with low concentrations of the smallest particles showing particularly notable effects. The study suggests that microplastic contamination in agricultural environments may pose risks to crop development even at relatively low concentrations.
Influence of Polyethylene Terephthalate, Polyvinyl Chloride, and Low-Density Polyethylene Microplastics on Plant Growth Physiology in Three Model Crops
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Tiny plastic particles from pollution (called microplastics) can build up in soil and harm crops like chickpeas, oats, and flax—stunting their growth, damaging their leaves, and reducing how well they sprout, with plastic from bottles (PET) causing the most damage. Since these crops are part of our food supply, this research is a reminder that plastic pollution in farmland soil could eventually affect crop yields and the quality of food we eat.
Macroplastics on Soil-Plant System: Inhibiting Effects of Macroplastics on the Growth of Green Amaranth (Amaranthus viridis)
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Researchers tested how mixed plastic waste — polyethylene and disposable plastic cups — affects the growth of green amaranth plants in Bangladesh. They found that even low doses of plastic contamination inhibited plant growth, with higher doses causing progressively greater stunting, highlighting the threat of soil plastic pollution to agriculture.
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