Fig. 6. Ti content (A and B) and TEM observation (C–F) of the roots and leaves in CN19 under nTiO₂ exposure for 14 days. Data are represented as mean ± SD from four independent repetitions (n = 4). The Duncan's multiple range test showed that the values corresponding to the different letters were significantly different at P < 0.05. Condensed dark spots, shown with red arrow, indicated nTiO₂.