Fig. 5: Ethylene production in apple fruit during sun damage development.

Effect of photooxidative stress on the internal ethylene concentration (IEC) in Fuji (a) and Royal Gala (b) apples subjected to sudden sun exposure. Non-Exp: nonexposed fruit; Exp: exposed fruit without sun damage; Sev: exposed fruit with severe sun damage. The internal ethylene concentration (IEC) was quantified after different times of sun exposure. Data correspond to the mean ± SE of three biological replicates. Different letters indicate significant differences (P < 0.05; two-way ANOVA)