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Impacts of Plastics on Plant Development: Recent Advances and Future Research Directions
Summary
This review summarizes how microplastics and nanoplastics affect plant growth, from blocking seed germination and root development to causing oxidative stress and DNA damage in plant cells. Nanoplastics are small enough to be absorbed by roots and transported to stems, leaves, and even fruits. These findings are concerning for human health because they show that microplastics can enter the food supply through crops, creating a direct pathway for human exposure through plant-based foods.
Plastics have inundated the world, with microplastics (MPs) being small particles, less than 5 mm in size, originating from various sources. They pervade ecosystems such as freshwater and marine environments, soils, and the atmosphere. MPs, due to their small size and strong adsorption capacity, pose a threat to plants by inhibiting seed germination, root elongation, and nutrient absorption. The accumulation of MPs induces oxidative stress, cytotoxicity, and genotoxicity in plants, which also impacts plant development, mineral nutrition, photosynthesis, toxic accumulation, and metabolite production in plant tissues. Furthermore, roots can absorb nanoplastics (NPs), which are then distributed to stems, leaves, and fruits. As MPs and NPs harm organisms and ecosystems, they raise concerns about physical damage and toxic effects on animals, and the potential impact on human health via food webs. Understanding the environmental fate and effects of MPs is essential, along with strategies to reduce their release and mitigate consequences. However, a full understanding of the effects of different plastics, whether traditional or biodegradable, on plant development is yet to be achieved. This review offers an up-to-date overview of the latest known effects of plastics on plants.