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SUMMARY:Modulation of silver nanoparticle phytotoxicity by surface coating
  and microplastic co-exposure in Lemna minor
DTSTART;VALUE=DATE-TIME:20261002T080500Z
DTEND;VALUE=DATE-TIME:20261002T082500Z
DTSTAMP;VALUE=DATE-TIME:20260916T031633Z
UID:indico-contribution-2949@cern.ch
DESCRIPTION:Speakers: Sandra Vitko (University of Zagreb\, Faculty of Scie
 nce\, Department of Biology\, Croatia)\nSilver nanoparticles (AgNPs) and m
 icroplastics (MPs) are among the most prevalent emerging contaminants in f
 reshwater ecosystems\, yet the role of nanoparticle surface coating in mod
 ulating phytotoxicity\, particularly under co-exposure conditions\, remain
 s poorly understood. To address this\, we examined the individual and comb
 ined effects of two surface-coated AgNPs\, cetyltrimethylammonium bromide 
 (AgCTAB) and polyvinylpyrrolidone (AgPVP)\, and two MPs\, polystyrene (PS)
  and polymethylmethacrylate (PMMA)\, on the duckweed Lemna minor over a 7-
 day exposure period. Control plants were grown without the addition of AgN
 Ps or MPs. Relative growth rate\, chlorophyll a fluorescence (JIP-test)\, 
 pigment content\, and expression of photosynthesis-related genes were asse
 ssed on days 1\, 3\, and 7. AgPVP-based combinations with MPs (AgPVP+PS\, 
 AgPVP+PMMA) induced the most pronounced physiological stress from the earl
 iest timepoint\, while AgCTAB and AgPVP alone caused moderate effects on d
 ay 1. By day 3\, stress in AgPVP-treated plants intensified\, whereas AgCT
 AB-exposed plants showed signs of recovery towards control values. On day 
 7\, AgPVP+PS remained the most severely affected treatment\, while plants 
 treated with AgPVP and AgPVP+PMMA displayed partial recovery\, though with
  persistently reduced growth suggesting lasting physiological consequences
 . The observed physiological responses in the most affected treatments ind
 icate a decline in photosynthetic efficiency\, ultimately resulting in red
 uced plant growth. These results highlight the coating-dependent nature of
  AgNP phytotoxicity and suggest that microplastic co-exposure may modulate
 \, but not eliminate\, the adverse effects of AgNPs on aquatic macrophytes
 .\n\nhttps://indico.unina.it/event/117/contributions/2949/
LOCATION: Sala Monumentini
URL:https://indico.unina.it/event/117/contributions/2949/
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