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In tropical and subtropical regions of the world, where vegetable crops are grown, heat stress is a big problem. Four different varieties of Cucumber (Cucumis sativus) were assessed in 2021 under field circumstances in three sowing dates (15th March, 1st April, and 15th April). The genotypes L3466 indicated as heat tolerant genotypes exhibited the lowest water loss with a transpiration rate of 2.97 mmol m-2 s-1 on the initial sowing date. Poinsett had the highest transpiration rate of 4.38-mmol m-2 s-1 during the third sowing date, followed by Suyo Long with 4.18 mmol m-2 s-1. Heat-sensitive genotypes had increased transpiration rates and lost more water at higher temperatures, resulting in plant withering in third sowing date. The performance of genotypes remained satisfactory at first and second sowing dates.
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