Fig. 4.
Radar chart of the relative response of plant oxidative stress parameters (a, c, e, g) and two way ANOVA of plant oxidative stress index (POSI) (b, d, f, h) in E. tereticornis (ET) (a, b), E. urophylla (EU) (c, d), E. grandis (EG) (e, f), and E. urophylla × E. grandis (EU × EG) (g, h), respectively. Values are averages ± standard errors (n = 4). The P-values for aluminum (Al), silicon (Si) and their interaction (Al × Si) were based on a Two-way ANOVA. Malondialdehyde content, MDA; nicotinamide adenine dinucleotide phosphate oxidase activity, NOX; O2·− content, O2·−; hydrogen peroxide content, H2O2