The effect of different bands of ultraviolet radiation on morphological and physiological parameters in Pepper (Capsicum annuum L.)

Ultraviolet radiation is energetically capable of disrupting proteins. Ultraviolet radiation divides to three bands UV-A (320-390 nm), UV-B (280-320 nm) and UV-C (254-280 nm). Several studies have indicated that enhanced UV-B radiation can deleteriously affect physiological processes and overall growth in a number of plant species. In this research, the effects of different bands of UV-radiation were studied on the germination growth parameters, Sugar and Protein contents of plant Pepper (Capsicum annuum L.). The plants were grown in vermiculite medium using pots. Before applying the UV treatments, plants were subjected to a based nutrient solution (Hoagland solution) for 5 weeks. After 5 weeks, plants were for 2 weeks under treatment UV. Data were analyzed using SPSS software, and averages were compared by Duncan test. In each experiment was used 4 replicates. The results indicated that, UV light sped the germination of these seeds but the subsequent growth of the seedlings was markedly retarded. The results showed that under our experimental conditions UV-B and UV-C radiation decreased shoot and root dry weight. Furthermore, this treatment induced significant decreased of Leaf area. Content of soluble Sugar decreased significantly in leaves and roots of treated plants in comparison with control. The different bands ultraviolet radiation decreased Protein content. By considering to obtained results in this study we concluded that UV-A often harmful in plant, but UV-B and UV-C have serious effects on plant.