Figure 1.

Root elongation of Allium cepa exposed to AgNPs, PVP, and AgNO₃ with different concentrations after 24 (black), 48 (dark gray), and 72 h (gray) of exposure. The negative control (C−) was distilled water, and 0.37 µg/mL of sodium arsenite was used as a positive control (C+). Dotted lines were included for comparative purposes that show the elongation observed for negative control on each evaluated time. * Indicates significative differences with the negative control (p < 0.05); § indicates significative differences with the positive control (p < 0.05) after 72 h of exposure.