Heat Treatment in Two Tomato Cultivars: A Study of the Effect on Physiological and Growth Recovery

High temperature (HT) significantly affects crop physiological traits and reduces productivity in plants. To increase yields as well survival of crops under HT, developing heat-tolerant plants is one the main targets breeding programs. The present study attempted to investigate linkage heat tolerance between seedling reproductive growth stages tomato cultivars ’Dafnis‘ ’Minichal.’ This research was undertaken evaluate two experimental designs such screening at stage from greenhouses. Survival rate responses seedlings tomatoes with 4-5 true leaves were estimated HT (40 °C, RH 70%, day/night, respectively) control greenhouse conditions (day time 28 °C 40 respectively). Heat stress affected physiological–chemical (photosynthesis, electrolyte conductivity, proline) vegetative parameters (plant height, shoot fresh weight, root weight) all seedlings. findings revealed that regardless photosynthesis, chlorophyll, total proline electrical conductivity varied during period. might not always be associated parameters. reduced fruit weight (31.9%), length (14.1%), diameter (19.1%), hardness (9.1%) compared NT heat-susceptible cultivar ‘Dafnis’, while ‘Minichal’ (7.1%) (12.1%) decreased by effects but on contrary (3.6%) (8.3%) increased. In conclusion, selection for should evaluated consideration