Figure 4.
The effect of cell-free culture filtrates of B. subtilis and S. endus on the enzymatic antioxidant defense system of B. cinerea-infected apple fruits at room temperature. (A,C) The peroxidase activity (μM of tetra guaiacol g−1 FW min−1) during 1st trial and 2nd trial, respectively. (B,D) Polyphenol oxidase activity (arbitrary units) during 1st trial and 2nd trial, respectively. Bars denote the means ± standard deviations (means ± SD). Different letters signify statistically significant differences among treatments using Tukey’s Honestly Significant Difference (HSD) Test (p < 0.05).