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Impact of Microplastics on the Growth and Physiological Response in Zea mays and Sorghum bicolor
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Scientists found that tiny plastic particles in soil harm corn and sorghum plants by stunting their growth and damaging their ability to make food through photosynthesis. The study showed that some plastics like PVC (found in pipes and packaging) were more toxic to plants than others, and higher amounts of plastic caused more damage. This matters because these plastic particles are building up in farm soils where our food is grown, which could affect crop production and potentially the safety of our food supply.
The accumulation of microplastics (MPs) in agricultural soils poses a growing risk to terrestrial ecosystems, yet polymer-specific phytotoxic mechanisms remain only partially resolved. This study assessed the effects of 2% and 5% concentrations of low-density polyethylene (LDPE), polyvinyl chloride (PVC), and polypropylene (PP) MPs on Zea mays and Sorghum bicolor. Microplastic exposure induced reductions in plant growth parameters and photosynthetic pigments, accompanied by enhanced oxidative stress, depending on the concentrations. Soil enzymatic activities including dehydrogenase, acid and alkaline phosphatase were also significantly modulated, indicating alterations in biochemical processes and nutrient cycling in soil. Among the three types of MPs studied, the marked phytotoxic responses were witnessed in PVC, followed by LDPE, whereas PP exhibited comparatively lower toxicity. Consistently the highest MP concentrations (5%) led to more pronounced detrimental effects on both the plants. These findings shed light on polymer-specific and concentration-dependent impacts of MP on plants and emphasize the critical need for deeper understanding and more comprehensive regulatory mechanisms that could be beneficial in improving plant tolerance and various remedial measures to reduce the effects of the MPs on the agroecosystems.
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Effects of Polyethylene Microplastics on Seed Germination, Seedling Growth, and Physiological Characteristics of Maize
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Scientists found that tiny plastic particles (from everyday plastic waste breaking down in soil) can harm corn plants, reducing seed sprouting, stunting growth, and damaging the plant's cells, especially at higher plastic concentrations. This matters because corn is a staple crop worldwide, and if microplastics are building up in farm soils, it could mean lower harvests and less nutritious food down the line, plus it raises questions about whether these plastic particles are also making their way into the food we eat.
Impact of microplastic particle size on physiological and biochemical properties and rhizosphere metabolism of Zea mays L.: Comparison in different soil types
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Researchers found that smaller microplastics caused more harm to corn plant growth than larger ones, and that soil type affected how toxic the microplastics were. The microplastics disrupted root metabolism and weakened the plants' ability to produce lignin, a structural compound important for healthy roots. This matters for food safety because microplastic contamination in farm soil could reduce crop yields and potentially affect the nutritional quality of food.
Microplastic Contamination Alters Soil Hydraulic Properties and Inhibits Maize Growth: A Factorial Assessment Across Contrasting Soil Textures.
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Tiny plastic bits (microplastics) from things like plastic waste breakdown are building up in farm soil, and this study found they can mess with how well soil holds and moves water — which affects how crops like corn grow, especially in denser, clay-heavy soils. This matters because if microplastic pollution is quietly reducing crop growth in certain soil types, it could impact food supply over time, and the corn plants themselves may be absorbing these plastics as they grow. More research is needed to know exactly how this affects the food we eventually eat, but it's a reminder that plastic pollution's reach extends into our food system, not just oceans and
Effects of Microplastic Pollution on Growth, Photosynthesis, and Nutritional Composition of Maize ( Zea mays L.)
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Scientists grew corn plants in water mixed with tiny plastic particles (the kind found in common plastics like food packaging) and found the plants grew smaller, struggled to photosynthesize, and absorbed less of key nutrients like calcium, magnesium, and iron, while oddly soaking up more zinc. This matters because corn is a staple crop worldwide, and if microplastic pollution is silently throwing off the nutrient balance in our food crops, that could mean less nutritious food on our plates as plastic pollution keeps building up in soil and water.
Influence of soil microplastic contamination on maize (Zea mays) development and microbial dynamics
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Researchers grew maize (corn) in soil contaminated with varying amounts of microplastics and found that higher microplastic levels disrupted soil bacteria and fungi, caused leaf damage like yellowing and tissue death, and led to elevated heavy metals in plant tissue above safe limits. The results point to serious risks microplastics pose to crop health, soil ecosystems, and food safety.
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