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Updated: Nov 13, 2025

Collection of Alfalfa Root Exudates to Study the Impact of Di2-ethylhexyl Phthalate on Metabolite Production
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Polystyrene particles combined with di-butyl phthalate cause significant decrease in photosynthesis and red lettuce

Youming Dong1, Zhengguo Song2, Yu Liu3

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Environmental Pollution (Barking, Essex : 1987)
|March 13, 2021
PubMed
Summary

Polystyrene microplastics harm red lettuce photosynthesis and quality by reducing nutrient bioavailability and increasing oxidative damage. Nano-sized plastics were more detrimental than micro-sized ones.

Keywords:
Combined pollutionDi-butyl phthalateLettuce qualityMicroplasticsPolystyrene particles

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Area of Science:

  • Environmental Science
  • Plant Science
  • Toxicology

Background:

  • Microplastics (MPs) are pervasive environmental pollutants with potential adverse effects on organisms.
  • The specific impacts of polystyrene (PS) microplastics on vegetable crops, like red lettuce, remain incompletely understood.

Purpose of the Study:

  • To investigate the effects of nano- and micro-sized PS MPs and dibutyl phthalate (DBP) on red lettuce (Lactuca sativa L. Red Sails) photosynthesis and quality in a hydroponic system.
  • To elucidate the interaction between PS MPs and DBP and its consequences on plant physiology.

Main Methods:

  • Hydroponic cultivation of red lettuce exposed to varying concentrations and sizes of PS MPs and DBP.
  • Assessment of photosynthetic parameters, chlorophyll content, oxidative stress markers (hydrogen peroxide, malondialdehyde), soluble protein, sugar content, nitrite accumulation, and root activity.
  • Molecular simulation and experimental validation to understand MP-phthalate interactions.

Main Results:

  • PS MPs reduced DBP bioavailability and decreased photosynthetic parameters and chlorophyll content by altering chlorophyll protein structure.
  • PS MPs exacerbated DBP-induced oxidative damage, increasing hydrogen peroxide and malondialdehyde levels.
  • Soluble protein and sugar content decreased with higher PS concentration and smaller PS size, potentially due to inhibited root and RuBisCO activity.
  • Nitrite content increased, indicating reduced lettuce quality, and nano-sized PS showed greater negative impacts than micro-sized PS.

Conclusions:

  • Polystyrene microplastics significantly impair red lettuce growth, photosynthesis, and quality, especially in the presence of dibutyl phthalate.
  • The size of microplastics influences their impact, with nano-sized particles exhibiting more severe detrimental effects.
  • This study highlights the potential risks of microplastic contamination to vegetable crop production and food safety.