Copper oxide nanoparticle mediated DNA damage in terrestrial plant models.

Area of Science:

• Environmental Science
• Toxicology
• Plant Science

Background:

• Engineered nanoparticles (NPs) are increasingly released into the environment.
• Metal and metal oxide NPs can mediate DNA damage in various organisms.
• Molecular mechanisms of NP-induced DNA damage in plants remain poorly understood.

Purpose of the Study:

• To investigate DNA damage induced by copper oxide nanoparticles (CuO NPs) in plants.
• To assess the impact of CuO NPs on plant growth.
• To elucidate the mechanisms of CuO NP-mediated DNA damage.

Main Methods:

• Controlled laboratory experiments exposing radish, perennial ryegrass, and annual ryegrass to CuO NPs.
• Quantification of specific oxidatively modified DNA lesions (e.g., 8-oxoguanine).
• Comparison of DNA damage levels induced by CuO NPs, copper ions, and macroscale copper particles.

Main Results:

• Copper oxide nanoparticles induced significant accumulation of mutagenic DNA lesions in all tested plant species.
• Plant growth was strongly inhibited in the presence of CuO NPs.
• Evidence of multiple DNA lesion formation and accumulation in plants was observed for the first time.

Conclusions:

• Copper oxide nanoparticles are potent inducers of DNA damage and growth inhibition in agricultural and grassland plants.
• This study provides the first evidence of CuO NP-mediated multiple DNA lesion formation in plants.
• Findings highlight the need for further research into nanoparticle toxicity and plant DNA repair mechanisms.