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Effects of exogenous hydrogen peroxide with different concentrations on PAL activity (a) and RA accumulation (b) in the S. miltiorrhiza suspension cultured cells. The salicylic acid concentration is 22.5 mg/L. Values are means of three independent experiments. Bars represented standard errors. Different lowercase letters represent the significant differences between PAL activity (a) and RA content (b) after each treatment at the level of 5%.
