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Crops cultivated during summer in greenhouses and screen-covered structures (screenhouses) are negatively affected by stressful temperatures and vapor pressure deficit (VPD), which in turn influence yield and product quality. Fogging systems have been proposed as cooling methods to mitigate the adverse effects of high evaporation and excess temperatures in greenhouses. To evaluate the possible action of the fogging system on antioxidant response in cherry tomato ( Solanum lycopersicum ) fruit production, we studied the behavior of reactive oxygen species (ROS) scavenger enzymes such as superoxide dismutase, catalase, guaiacol peroxidase, enzymes involved in the ascorbate-glutathione cycle (Halliwell-Asada cycle), and compounds with antioxidant functions such as ascorbate, glutathione, proline, and polyamines. Fogging-screenhouse treatments, SF (a fogging system inside the screenhouse) and SFS (fogging system with a plastic sheeting, to maintain the microclimate created by the fogging system in the screenhouse) showed the best performance in terms of radiation with a percentage reduction of incident radiation on the crop of 18% and 37% and a mean reduction of maximum VPD values of 0.4 and 0.2 kPa, respectively, compared with the unfogging treatment (S). These improved environmental conditions, besides promoting the highest activities of ROS-scavenging enzymes and Halliwell-Asada cycle, the redox state of the ascorbate, and a low proline:free putrescine ratio, would explain the increase in commercial weight of fruit by 21% and 17% in SF and SFS, respectively, with respect to S.

A Fogging System Improves Antioxidative Defense Responses and Productivity in Tomato