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Selected Publication:

Wonisch, A; Tausz, M; Muller, M; Soja, G; Grill, D.
(2003): Ozone-induced long-term effects on chromosomal aberration rates in root-tip meristems of spruce trees do not correspond to changes in tissue antioxidant status
PHYTON-ANN REI BOT A. 2003; 43(1): 147-160.

Ozone effects on 8-year-old clonal spruce trees [Picea abies (L.) KARST.] were investigated in a glasshouse fumigation system. Fumigated trees experienced ozone concentrations up to 80 nl l(-1) versus control plants exposed to ambient air background concentrations of maximum peaks below 40 nl l(-1). Antioxidants and pigments in one-year-old needles, antioxidants in fine roots, and chromosome damages and mitotic indices were determined at the end of the fumigation period and one year later after growing the trees under ambient conditions. Chromosomal aberration rates in root-tip meristems increased upon ozone treatment (7 to 8 % versus 4 to 5 % in controls) and remained at elevated levels for one year after the fumigation was terminated. However, these changes were not accompanied by alterations in the antioxidant systems in needles or roots. Irrespective of the treatment, roots contained less ascorbate and tocopherol than needles and the redox state of ascorbate and glutathione was more oxidized in the fine root tissues. Ozone treatment caused an increase in total glutathione concentrations in needles (860 vs 630 nmol g(-1) dry weight), but this effect vanished after the one year recovery period. It may be concluded that for long-lasting ozone effects chromosomes are more sensitive indicators than antioxidants in leaves or roots.
Authors BOKU Wien:
Soja Gerhard

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Picea abies

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