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Jehnes, S.* ; Alexou, M.* ; Betz, G. ; Bahnweg, G. ; Sandermann, H. ; Rennenberg, H.* ; Haberer, K.*

Kranzberg forest Experiment: Variations in stable isotope ratios and contents of antioxidants in adult beech trees. Injury amplification reactions mediated by ethylene and salicylic acid and tree internal signalling of ozone stress at the gene level.

In: Proceedings (Workshop Critical Levels of Ozone: Further Applying and Developing the Flux-based Concept). Wien: Bundesforschungs- und Ausbildungszentrum für Wald, Naturgefahren und Landschaft (BFW), 2006. 341-344
To determine the effect of chronic ozone exposure on the signature of stable isotopes (%₀¹³C, %₀¹⁸O, %₀ ¹⁵N) in different organs of adult beech (fagus sylvatica), leaves, cellulose, phloem exudates, fine roots and different types of associated mycorrhizae were analysed in two consective years (2003 and 2004 %₀ ¹⁵N in leaf bulk material and fine roots was decreased by the enhanced ozone regime whilst %₀¹³C and %₀¹⁸O werde not influenced. Total N values in 2004 were affected by ozone in foliar and fine root material as well. Additionally contents of ascorbate and glutathione were analysed in leaves and fine roots of adult beech trees under ambient and double ozone regimes. Total ascobate in leaf extracts was not affected, whilst the redox state was influenced by the double ozone concentration in July 2003 and 2004. Contents of total apoplastic ascorbate were generally decreased under enhanced ozone. To get an insight into the injury amplification reactions due to chronic ozone exposure, levels of 1-aminocyclopropane-1-carboxylic acid (ACC) and salicylic acid (SA) were analysed in the leaves of fumigated and control trees. In both of these plant homromones the conjugated, accumulative forms showed increased levels in the double ozone regime in July 2003 and ACC also in Junie 2003 and July 2004. Further investigation was done on the expression level of different genes related to stress response and injury amplification. Induction of the gen expression level under enhanced ozone ws found in ACS2 (ACC synthase), PR1 (pathenogenesis related protein) and NCED1 (Nine-cis-epoxycarotenoid dioxygenase) in both years.
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Publication type Article: Conference contribution
Editors Wieser, G.* ; Tausz, M.*
Keywords no keywords
ISBN 3-901347-65-8
Conference Title Workshop Critical Levels of Ozone: Further Applying and Developing the Flux-based Concept
Proceedings Title Proceedings
Quellenangaben Volume: , Issue: , Pages: 341-344 Article Number: , Supplement: ,
Publisher Bundesforschungs- und Ausbildungszentrum für Wald, Naturgefahren und Landschaft (BFW)
Publishing Place Wien
Institute(s) Institute of Biochemical Plant Pathology (BIOP)