O2− production and H2O2 content in strawberry fruit increased throughout the whole storage. Significantly (p < 0.05) lower levels of these two ROS were observed in blue light-treated fruit than in the control fruit after 4 days of storage (Fig. 4D and E). MDA content in both blue light-treated and control strawberry fruit decreased for the first 2 days, then increased during the remaining time. Blue light treatment delayed the increase of MDA content, which made the content always lower in the treatment than in control after 4 days of storage (Fig. 4F).