Fig. 1.

Phenotype of wild-type (SR1, a, d, g, j, m) and transgenic (rolB, b, e, h, k, n, and rolB-AtPCS1, c, f, i, l, o) tobacco plants non-treated (Control, a–c) and treated with either 50 or 200 μM Na₂HAsO₄.7H₂O (50 As, d–f and 200 As, g–i), or with 60 μM CdSO₄ (60 Cd, j–l), or with 50 μM Na₂HAsO₄.7H₂O plus 60 μM CdSO₄ (50 As + 60 Cd, m–o), and mean length (±SE) of primary roots after 9 days of treatment (p). Letter a, P < 0.01 difference with respect to the other genotypes within the same treatment. Letter b, P < 0.05 difference with respect to the rolB within the same treatment. Columns followed by no letter within the same treatment are not significantly different. Significant differences between treatments are reported in the text. n = 30