Fig. 8. Quantitative RT-PCR of four candidate genes related to H2O2 production. (A) PGLP1. (B) GOX1. (C) GOX2. (D) GOX3. Transcript levels are normalized to ACTIN and UBQ7, and error bars represent standard error (n = 3). Different letters indicate significant differences (a lower-case letter for P. alba × P. davidiana and a capital letter for P. davidiana based on ANOVA with Tukey’s HSD, P < 0.05).
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