Fig 2. Effects of silicon amendment and Cnaphalocrocis medinalis infestation on activities of SOD (A), POD (B), CAT (C), PAL (D) and PPO (E) and concentration of MDA (F) in rice leaves.

+Si = silicon amendment at 0.32 g Si/kg soil to rice plants,–Si = no silicon amendment. +LF = infestation of C. medinalis larvae,–LF = no infestation. Values are means ± SE from 3 replicates measured with different leaf samples. In each panel, the means labeled by different letters at a certain time point post C. medinalis infestation are significantly different at P < 0.05 according to Tukey’s multiple range tests.