Abstract: “Okra (Abelmoscus esculentum L.) is an important summer vegetable of family Malvaceae. As temperature of the world is rising day by day due to climate change, the physiological behavior of crops is also changing and tolerance against heat is getting minimize. For this purpose, a research trial was conducted to screen different okra genotypes against high temperature (45/35°C day/night).Plants were grown in growth room at (28/22 °C day/night) temperature for four weeks. After four week temperature was gradually increased by 2°C to avoid sudden osmotic shock until the desired high temperature (45/35°C day/night) was achieved and genotypes were kept at this temperature for one week. Finding of this research showed wilting of seedlings, reduced leaves size, induced senescence and change of colour from green to yellow black, drastic decrease in fresh and dry matter contents reason can be the high transpiration rate disturbance or injuries in the physiological processes occurring within cell”

Keywords: heat stress, okra, tolerance, genotypes