Seasonal changes in antioxidant level of scots pine (Pinus sylvestris L.) needles exposed to industrial pollution. I. ascorbate and thiol content |
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Authors: | Stanis?awa Pukacka Pawe? M Pukacki |
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Institution: | (1) Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62-035 Kórnik, Poland |
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Abstract: | Current and previous year needles from three 16 years-old populations of Scots pine (Pinus sylvestris L.) trees were seasonally collected at the three experimental areas: Luboń- close to the phosphate fertiliser factory, Głogów
— close to the copper foundry and Kórnik — control site. Głogów is the most polluted site, where at 1998 monthly mean daily
concentrations of different pollutants were: SO2 - 17 μg·m−3, NOx - 12 μg·m−3 and dust containing heavy metals as Cu, Pb, Cd - 29 μg·m−3. Trees growing in Luboń were influenced for many years by high concentration of SO2 and fluor compounds. A few years ago emissions were markedly reduced, but low pH of soil and high concentration of aluminium
ions still influence the growth of trees. Seasonal changes of ascorbate and thiol content were observed in each needle class
and population, with the maximum in the winter and minimum in the summer. In needles from trees growing on polluted sites
higher level of ascorbic acid and thiols comparing to control site was observed. Significant differences appeared in each
population of Scots pine growing under higher pollution stress in the Głogów site. In needles from trees growing in Luboń
significant differences in ascorbic acid and thiols content were evidently less numerous. Needles from polluted sites in some
seasons contained significantly more malondialdehyde (MDA) and those was more frequent in Głogów than in Luboń. The results
indicated that in the Głogów site trees are more influenced by pollution stress than in Luboń and the defense reaction measured
as an increase of the antioxidant level is more evident. |
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Keywords: | oxidative stress reactive oxygen species malondialdehyde |
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