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Activity of (A) catalase (CAT), (B) superoxide dismutase (SOD), (C) polyphenol oxidase (PPO) and (D) peroxidase (POD) in the roots of Si amended and un-amended rice plants after inoculation with third-instar LF larvae. Si and LF treatments were performed as described for experiments shown in Figure 1, 2. Values are mean ± SE (n = 6). For each time point, letters above bars indicate significant difference among treatments (Tukey’s multiple range test, P < 0.05).
