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Area of Science:

  • Environmental Science
  • Plant Biology
  • Nanotechnology

Background:

  • Nanoparticles (NPs) are increasingly prevalent in the environment.
  • Polystyrene NPs (PS NPs) are common environmental contaminants.
  • The impact of PS NPs on crop plants requires further investigation.

Purpose of the Study:

  • To investigate the phytotoxicity of PS NPs in rice (Oryza sativa L.).
  • To compare the effects of root vs. foliar exposure to PS NPs.
  • To elucidate the mechanisms of PS NP-induced photosynthesis inhibition.

Main Methods:

  • Hydroponic and soil-based exposure experiments with varying PS NP doses.
  • Confocal imaging to track PS NP localization in rice leaves.
  • Biochemical assays to measure photosynthetic pigment content, enzyme activities, and ATP production.
  • Physiological measurements of photosynthetic rates, stomatal conductance, and transpiration.
  • Transcriptomic analysis to identify genetic responses.

Main Results:

  • Foliar exposure to PS NPs caused sustained photosynthesis inhibition, whereas root exposure only inhibited photosynthesis at high doses.
  • PS NPs accumulated in rice leaves, localizing with chloroplasts, leading to impaired light-dependent reactions and carbon fixation.
  • Significant reductions were observed in photosynthetic pigments, Hill reaction activity, ATP production, net photosynthetic rate, Rubisco activity, stomatal conductance, and transpiration rate.
  • Transcriptomic analysis revealed downregulation of core photosynthesis pathways and related genes.

Conclusions:

  • Foliar exposure to PS NPs induces significant phytotoxicity in rice, primarily by disrupting photosynthesis at the chloroplast level.
  • The accumulation and colocalization of PS NPs within chloroplasts are key mechanisms driving photosynthesis inhibition.
  • Atmospheric NPs represent an emerging threat to agricultural productivity and global food security.