Figure 5.

Time course of levels of H₂O₂ (A), superoxide anion (B) and hydroxyl radical (C) in grapefruit peel discs following Metschnikowia fructicola (Mf) treatment and control. The level of H₂O₂ is expressed as the fluorescence intensity (530 nm/590 nm) × 1000, the superoxide anion level is expressed as the increased absorbance at 580 nm/h/g/fresh weight (FW) and the hydroxyl radical level is expressed as the increased absorbance at 540 nm/g/FW × 1000. Values represent the mean ± standard error (n= 8–12). Value with different letters indicate significant differences according to Tukey's test (P < 0.05).