Influence of UV A+B radiation and heavy metals on growth, some metabolic activities and antioxidant system in pea(Pisum sativum) plant

Saleh, A. (2007) Influence of UV A+B radiation and heavy metals on growth, some metabolic activities and antioxidant system in pea(Pisum sativum) plant. Acta Botanica Hungarica, 49 (3-4). pp. 401-422. ISSN 0236-6495

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Abstract

The impact of the combined stress factors of heavy metals (cadmium and nickel) and UV A+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 hours/day to supplemental 6.4 KJ m−2d−1 dose UV A+B radiation beside white light (1,100 Lux), while the second one was exposed to white light only giving light intensity (1,100 Lux). Plants from each group were irrigated with nutrient solution having 0.0, 5, 10 and 20 μmol 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. UV A+B resulted in synergistic inhibitory effects of all measured growth parameters. Total chlorophyll, carotenoids, total carbohydrates and proteins showed a similar pattern to that of growth parameters. The amount of UV-screening pigments was highest under supplement of UV A+B radiation, while the combination of Cd or Ni and UV A+B caused further decrease. Thus, it could be shown that the combined treatment of UV A+B and Cd or Ni was antagonistic on UV-screening pigments. The combined sterss of UV A+B radiation an Cd or Ni also resulted in a reduction of peroxidase and catalase activity, while H2O2 level and anthocyanin content were increased in Pisum sativum plant. The data showed that in some measured parameters there was a UV A+B and Cd or Ni synergistic effect, while with other parameters an antagonistic action was observed.

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