Effect of gold and silver nanoparticles on the growth of the Arabidopsis thaliana cell suspension culture

Resumo

The addition of 20-nm gold and silver nanoparticles to a growth medium has a positive effect on the growth of biomass of a cell suspension culture of Arabidopsis thaliana (L.) Heynh. Growing the cells with silver and gold nanoparticles causes different changes in the pH of the medium: the culture medium is made markedly acidic by the addition of silver nanoparticles and alkaline by the addition of gold nanoparticles. As is found by the MTT assay, metallic nanoparticles are responsible for a slight but steady decrease in the specific respiratory activity of cells of the A. thaliana suspension culture. Growth with the nanoparticles is accompanied by an increase in the intracellular free amino acid pool (alanine, γ-aminobutyric acid, and valine), which is characteristic of responses to abiogenic stresses. Furthermore, the addition of the nanoparticles changes the composition of extracellular proteins in the A. thaliana cell culture.