Here, we compared two tomato processing cultivars, H4107 and H9780, that we found to be constantly differing in yield performance. Understanding the physiological response of modern processing tomato cultivars to heat stress may facilitate the development of thermotolerant cultivars. Nonetheless, information on stress response in processing tomatoes is very limited. Processing tomato cultivars are cultivated in open fields, where environmental conditions are not controlled, therefore plants are exposed to multiple abiotic stresses, including heat stress. When tomato plants are exposed to ambient day/night temperatures that exceed 32☌/20☌ respectively during the reproductive phase, fruit set and fruit weight are reduced, leading to a significant decrease in yield. Tomato (Solanum lycopersicum), a major vegetable crop, is highly susceptible to conditions of heat stress.
Climate change is causing temperature increment in crop production areas worldwide, generating conditions of heat stress that negatively affect crop productivity.
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