Changes in physiological anatomical and parameters of okra (Hibiscus esculentus L.) under different ultraviolet radiation

In this study، okra plants were exposed to different ultraviolet (UV) radiation for 12 days. After treatment، leaf surface، root and stem length، fresh and dry weight and photosynthetic pigments، protein and sugar content were evaluated and the results showed that their contents were significantly decreased under UV radiation specially in UV-B and UV-C. The anatomical studies indicated that thickness in the different organs was decreased. Also، it was observed that stomatal density، index contents and stomatal length were increased under UV radiation in UV-B and UV-C. Because of the effects of UV radiation on epidermal cells of stem، leaf and petiole were observed to have decreased epidermal length but epidermal breadth was increased specially in UV-B and UV-C. The results of this study showed that UV-B and UV-C had serious effects on okra plant، but UV-A wasn’t harmful to okra plants.