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Effect of UV-B radiation on Vigna radiata L. Var. K-851

D.Dooslin Mary, M.Johnson, Gerardin Jayam

Investigations on morphological, physiological and biochemical changes such as the content of proline and quantitative and qualitative changes in proteinweremade in the seedlings of Vigna radiata L.Var.K-851following regular short time (10 and 20min/day) ultraviolet B irradiation. During the initial period of ultraviolet B irradiation several morphological changes such as reduction in leaf size and increase in leaf thickness occurred. The rate of photosynthesis decreased upon ultraviolet B treatment which was found to be due to a direct action on the light reactions. The biochemical analysis of the changes in the ultraviolet B treated plants showed reduction in proteins which could be due to the low levels of photosynthates formed. Protein profile changes have been manifested as tolerant, sensitive and induced proteins.