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Changes in activities of phenylalanine ammonia-lyase (PAL) (A) and polyphenoloxidase (PPO) (B) in leaves of rice seedlings amended with silicon (+Si) or not (−Si) post-inoculation with Xoo. The values are means of three replications. Vertical lines represent standard deviations. Asterisks denote significant difference at P < 0.05 between +Si and −Si treatments at a same time-point according to Student’s t-test.
