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Breaching the Root Barrier: Uptake Pathways, Rhizosphere Microenvironment Regulation, and Physiological Metabolic Responses of Rice to Nanomaterials
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This review pulls together existing research on how tiny plastic particles and engineered nanoparticles in soil get absorbed by rice plants through their roots — a concerning entry point since rice is a dietary staple for billions of people. The findings show these particles act like a "Trojan horse," potentially carrying heavy metals and other contaminants into the rice grains we eat, while some engineered nanoparticles could actually help protect plants if designed carefully. The takeaway: as plastic pollution and nanotechnology use grow, more research is needed to understand what's actually ending up on our plates and how to keep it safe.
The rapid advancement of nanotechnology, coupled with the exacerbation of plastic pollution, has positioned the continuous accumulation of nanoparticles (NPs) and micro/nanoplastics (MNPs) in agricultural soils as a critical global concern. As one of the world's primary staple crops, the root system of rice (Oryza sativa L.) serves as the initial line of defense and response against nano-pollutants. The multidimensional interaction mechanisms of NPs within complex soil-rice systems, however, remain insufficiently elucidated. This review comprehensively synthesizes the interfacial interactions between NPs and rice roots, their uptake and translocation pathways, and the dual biological effects they induce. The assimilation and systemic translocation of NPs are dynamically governed by particle physicochemical traits (e.g., size, surface charge, and coating chemistry) and rice-specific rhizosphere modulators, notably the iron plaque and root exudates. It is particularly noteworthy that NPs exhibit a pronounced "double-edged sword" effect on rice: rationally designed nano-agrochemicals can function as elicitors to activate plant defense systems and effectively immobilize heavy metals. Conversely, emerging nanoplastics induce severe oxidative stress and metabolic disruption. Furthermore, these particles act as potent vectors, utilizing a "Trojan horse" mechanism to facilitate the co-transport of heavy metals and agrochemicals, thereby breaching root barriers and exacerbating dietary exposure risks. To systematically bridge existing knowledge gaps, we propose a comprehensive research roadmap emphasizing realistic field exposures, soil-rice-microbiome coupling, combined pollution dynamics, in planta quantification, and grain bioaccessibility assessments. This holistic paradigm ultimately provides robust scientific substantiation for the risk assessment of nano-pollutants and the promotion of sustainable nano-agriculture.
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Researchers reviewed how micro- and nanoplastics harm rice — a staple crop feeding billions — by disrupting root growth, reducing photosynthesis, altering soil microbes, and making heavy metals more available to plants. The review proposes that ecological engineering strategies like microbial bioremediation and organic soil amendments could help protect agricultural land from plastic contamination.
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Researchers reviewed how micro- and nanoplastics enter rice paddies through irrigation, mulch films, and atmospheric deposition, then harm soil health and rice plant growth by disrupting nutrient cycles and increasing oxidative stress. Their findings are especially significant because rice feeds more than half the world's population, yet research on plastic contamination in paddy systems remains very limited.
Nano-plastic contamination in soil: impacts on rhizosphere volatile organic compound (VOC) signaling and rice disease susceptibility—a comprehensive review
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Tiny plastic particles from everyday products are contaminating farm soil and making rice plants more vulnerable to fungal diseases by interfering with the natural chemical signals plants use to fight off infections. This matters because it could reduce crop yields and potentially allow more pesticides to be used, while these same plastic particles can eventually end up in our food and water. This review suggests that plastic pollution in soil is a bigger problem for farming than scientists previously realized.
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This research review summarizes how tiny plastic particles called nanoplastics can get inside crop plants through their roots and leaves, potentially harming how plants grow and produce food. These ultra-small plastic pieces interfere with how plants absorb nutrients and respond to stress, which could threaten our food supply. Since we eat these crops, understanding how nanoplastics affect plant health is important for protecting both agriculture and human health.
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In a hydroponic experiment, researchers showed that both nano-sized (80 nm) and micro-sized (1 micrometer) polystyrene particles were absorbed by rice plant roots and transported up into stems and leaves. The particles traveled through the plant's vascular system and accumulated in cell walls and between cells. This finding is concerning because it demonstrates that microplastics in soil and water can enter food crops like rice and potentially reach people through their diet.
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