Study of effect of Ultraviolet radiation on some biochemical parameters in two varieties of wheat (Triticum aestivum L.) under salinity stress

Salinity and water stress are the major factors limiting plant growth and productivity. Against these stresses, plants adapt themselves by different mechanisms including change in morphological and developmental pattern as well as physiological and biochemical processes. Ultraviolet radiation has important morphological and physiological effects on plants. In this research the effects of UV-C and salinity stress on some biochemical parameters in two varieties of wheat (Dez and Darab) were investigated. seeds were exposed to UV 10 minutes every day up to 3days. Then seeds were sown and when seedlings were 21days old were treated with NaCl (5, 10 and 15 ds/m). two weak after salinity treatment, a, b and total chlorophyll content and carotenoid, anthocyanin and flavonoid content and electrolyte leakage were measured. Results showed that salinity stress had significant effects on a,b and total chlorophyll, carotenoid, anthocyanin and flavonoid contents and electrolyte leakage. Interaction of UV and salinity stress had significant effects on chlorophyll b, carotenoid, anthocyanin and flavonoids which had absorption at 300 and 330nm. Our results showed that UV pretreatment could only mitigate these reduction when salinity is not high (10 ds/m). But when salinity was high pretreatment with UV had no effects.