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Physiological and biochemical changes in plants exposed to high temperatures may lower their resistance to diseases. In this regard, this study investigated whether thermal oscillations could change wheat resistance to blast, caused by Pyricularia oryzae, considered one of the most important diseases affecting wheat production. Plants were kept in two growth chambers with temperatures of 19 and 28 °C each for five days for thermal acclimatization and inoculated with P. oryzae after that. After inoculation, groups of plants were transferred to their original growth chambers (19 and 28 °C) and switched to growth chambers with temperatures different from those used for acclimatization (from 19 °C to 28 °C and from 28 °C to 19 °C) during three days. Plants subjected to thermal condition (TC) of 19 °C→19 °C compared to TC of 28 °C→28 °C showed lower blast symptoms. Photosynthetic impairment (lower maximum …