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American Journal of Plant Physiology
Year: 2007  |  Volume: 2  |  Issue: 2  |  Page No.: 139 - 154

Influence of UVA+B Radiation and Heavy Metals on Growth, Some Metabolic Activities and Antioxidant System in Pea (Pisum sativum) Plant

Amal A.H. Saleh    

Abstract: The impact of the combined stress factors of heavy metals (cadmium and nickel) and UVA+B radiation in Pisum sativum was investigated. Seeds were grown in sandy loam for 30 days and then randomly divided into equal two groups. The first group was exposed for 5 h day-1 to supplemental 6.4 KJ. dose UVA+B radiation beside white light (1100 Lux), while the second one was exposed to white light only giving light intensity (1100 Lux). Plants from each group irrigated with nutrient solution having 0.0, 5, 10 and 20 ╬╝mol Cd or Ni for two weeks and then harvested. The results showed that, Cd or Ni treatments induced significant decreased the length, fresh weight, dry weight and density of both root and shoot. UVA+B resulted in synergistic inhibitory effects on all measured growth parameters. Total chlorophyll, carotenoid, total carbohydrates and proteins showed a similar pattern to that of growth parameters. The amount of UV-screening pigments and anthocyanin was highest under the supplemental UVA+B radiation, while the combination of Cd or Ni and UVA+B decreased them. From this result, it showed that the combined treatment of UVA+B and Cd or Ni showed an antagonistic effects on UV-screening pigments. The combined stress of UVA+B radiation and Cd or Ni also resulted in a reduction of peroxidase and catalase activity, while increasing of H2O2 level in Pisum sativun plant. The data showed that in some measured parameters was a UVA+B and Cd or Ni synergistic effect, while with other parameters an antagonistic action was observed.

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