title: Association between radionuclides (210Po and210Pb) and antioxidant enzymes in oak (Quercus coccifera) and mastic tree (Pistacia lentiscus).
abstract: The activity levels of naturally occurring radionuclides Polonium-210 and lead-210 in different subjects including plant species have direct or indirect impact on human beings. High levels of ionising radiation cause oxidative stress and the interaction between antioxidative defense and radionuclides is not well established in plant systems. In this study, we aimed to understand the impact of oxidative stress caused by210Po and210Pb in two Mediterranean plants; Quercus coccifera and Pistacia lentiscus. We analysed the constitutive and seasonal levels of210Po,210Pb, lipid peroxidation levels, superoxide dismutase (SOD) and ascorbate peroxidase (APX) activities in the field-collected samples. The highest activity concentrations of210Po and210Pb were detected in both plants in summer and Q. coccifera had higher levels than that of P. lentiscus. SOD and APX activity trends were different between oak and mastic; as compared to P. lentiscus, Q. coccifera efficiently used the two major components of antioxidative defense. Lipid peroxidation levels were low in both plants in all seasons except that of spring which were in good agreement with high antioxidant enzyme activities. In conclusion, we found that high210Po and210Pb activity concentrations in oak and mastic did not interfere with their growth and life cycles. The ability of both plants for survival and adaptation to Mediterranean environmental constraints provided an additional advantage for coping radionuclide induced oxidative stress as well.
authors: University of Ege, Institute of Nuclear Sciences, İzmir, Turkey.
authors: A
authors: A
authors: Uğur Görgün
authors: University of Ege, Institute of Nuclear Sciences, İzmir, Turkey.
authors: E
authors: E
authors: Aslan
authors: University of Ege, Institute of Nuclear Sciences, İzmir, Turkey.
authors: M
authors: M
authors: Kül
authors: University of Ege, Faculty of Science, Department of Biology, İzmir, Turkey.
authors: S
authors: S
authors: İlhan
authors: University of Ege, Faculty of Science, Department of Biology, İzmir, Turkey.
authors: G
authors: G
authors: Dimlioğlu
authors: University of Ege, Faculty of Science, Department of Biology, İzmir, Turkey. Electronic address: melike.bor@ege.edu.tr.
authors: M
authors: M
authors: Bor
authors: University of Ege, Faculty of Science, Department of Biology, İzmir, Turkey.
authors: F
authors: F
authors: Özdemir
mesh_terms: D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D007856:Lead Radioisotopes / Q000032:analysis / Q000633:toxicity*; D015227:Lipid Peroxidation / Q000528:radiation effects; D018384:Oxidative Stress; D027927:Pistacia / Q000502:physiology* / Q000528:radiation effects; D018515:Plant Leaves / Q000378:metabolism; D011059:Polonium / Q000032:analysis* / Q000633:toxicity; D029963:Quercus / Q000502:physiology* / Q000528:radiation effects; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D007856:Lead Radioisotopes; D002734:Chlorophyll; D011059:Polonium; D002374:Catalase; D013482:Superoxide Dismutase
keywords: (210)Pb; (210)Po; Ascorbate peroxidase; Lipid peroxidation; Malondialdehyde; Superoxide dismutase