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Root Meristem Maintenance Mechanisms are Key to Plant Defense Against Nanoplastics

Advanced Science 2025 3 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count. Score: 58 ? 0–100 AI score estimating relevance to the microplastics field. Papers below 30 are filtered from public browse.

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Summary

Researchers discovered that the smallest nanoplastics (20 nanometers) dramatically inhibit root growth in plants, while larger particles have minimal effects. The tiny plastics damage root meristem cells and block cell division, prompting plants to activate defense mechanisms that redirect the growth hormone auxin to protect their roots. However, this defensive response comes at a cost, impairing the plant's ability to sense gravity, which is essential for adapting to its environment.

Polymers

The pervasive prevalence of nanoplastics in environment poses a challenge that threatens ecosystem and agricultural production. Despite their ubiquity, the determinants of nanoplastics phytotoxicity and the mechanisms through which plants defend against this phytotoxicity remain poorly understand. In this study, it is demonstrated that the phytotoxicity of nanoplastics is inversely correlated with particle size. Specifically, polystyrene-nanoplastics sized at 20 nm dramatically inhibit root growth in Arabidopsis, while larger particles (100 to 1000 nm) have minimal effects. Mechanistically, these small nanoplastics primarily target the root meristem (RM), disrupting cell integrity and inhibiting cell division, which impairs root development. Plants employ two key defense strategies to counteract this toxicity: i) upregulating genes associated with RM maintenance and ii) accumulating auxin in the roots by inhibiting the auxin efflux transporter PIN2-dependent efflux of auxin, thereby reducing upward transport. However, this defensive response comes at a cost, as it also impairs root gravitropism, a critical process for plant adaptation to environmental changes. These findings provide valuable insights into the mechanisms of nanoplastic-induced phytotoxicity and plant defense, establishing a foundation for the development of biosafe plastic products and strategies to genetically enhance plant resistance to tiny nanoparticle exposure by optimization of intrinsic detoxification pathways.

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