Microplastics have become widespread across the planet as plastic production continues to rise. Most plastics are not recycled, and nearly 80% ends up in landfills or the environment, where they can break down into small fragments that spread through air, water, and soil. These microplastics come from many everyday sources: synthetic clothing fibres, car tire wear, agricultural films, packaging, sewage sludge, personal care products with microbeads, and even medical waste such as disposable masks.

Once in the environment, microplastics travel easily. Wind can blow them across long distances, rain washes them deeper into the soil, and soil organisms like earthworms and insects can transport microplastics through the soil. As a result, soils act as major sinks for microplastics.

How do plants interact with these particles? Research shows that roots can take up both nano- and microsized plastics through tiny cracks, root hairs, or water channels. Once internalized, the particles can be transported upwards into stems and leaves through the plant’s vascular system. Leaves can also absorb airborne microplastics through their stomata. This indicates that microplastics possibly end up in edible parts of crops such as wheat, lettuce, and fruits—creating a direct pathway into the human diet.

After uptake, microplastics can interfere with important plant functions. They can clog tissues, disrupt water and nutrient uptake, reduce root and shoot growth, and trigger oxidative stress. This stress can damage membranes, slow photosynthesis, and even alter gene expression. In some plants, microplastics suppress natural defence mechanisms. As plants are at the base of the food chain, the effects of microplastic pollution are not limited to fields. Microplastics that accumulate in edible plant parts, such as fruits, leaves, and roots, can move into livestock feed and human food. This makes microplastics not only an environmental issue but also a potential risk for food safety and public health.

Scientists are now developing better tools to detect microplastics in soils and crops and exploring solutions to reduce pollution. Promising options include improved wastewater treatment, biodegradable materials, engineered microbes for plastic degradation, and better waste management practices in agriculture. However, long-term field trials under real agricultural conditions research are needed to fully understand how microplastics behave in soils and how they affect crops over time.

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