Figure 4.
Effect of arsenic on the antioxidant enzymes activities in two contrasting tobacco genotypes ((A,C,E,G) tolerant N.tabacum, cv.Wisconsin, (B,D,F,H) sensitive N. sylvestris). 0, 10, and 30 µg l−1 arsenate treatments. APX—ascorbate peroxidase (A,B), GST—glutathione-S-transferase (C,D), CAT—catalase (E,F), POX—peroxidase (G,H). Bars indicate standard deviations. Stars mean statistically significant differences from control at the level α = 0.1 ((*)), 0.05(*), 0.01 (**) or 0.001(***), n = 5.