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Scopoletin (Scp) content (A) and salicylic acid (SA) content (B) in rubber tree leaves after being treated with 0.25 mg/mL SWE and distilled water at 0, 24, 48, 72, 96 and 120 h after treatment (HAT). HPLC Chromatograms obtained from a Scp and SA standard mixture and leaves sample extract (C). Data were presented as mean ± S.E. (n = 3). Statistical analysis was performed using a one-way ANOVA, taking p < 0.05. The letters indicate the significant differences among time points.
