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Significance of ozone exposure for inter-annual differences in primary metabolites of old-growth beech (Fagus sylvatica L.) and Norway spruce (Picea abies L.) trees in a mixed forest stand.

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The influence of long-term free-air ozone fumigation and canopy position on leaf contents of total glutathione, its redox state, non-structural proteins (NSP), soluble amino compounds, and total soluble sugars in old-growth beech (FAGUS SYLVATICA) and spruce (PICEA ABIES) trees were determined over

Effects of elevated pCO2 and/or pO3 on C-, N-, and S-metabolites in the leaves of juvenile beech and spruce differ between trees grown in monoculture and mixed culture.

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Three and four-year-old saplings of beech (Fagus sylvatica L.) and spruce (Picea abies (L.) Karst.) grown in monoculture and mixed culture were exposed in phytotrons to (1) ambient air, (2) elevated pO(3), (3) elevated pCO(2), or (4) elevated pCO(2) plus elevated pO(3). After 5 months, the contents

Transcriptome analysis of ozone-responsive genes in leaves of European beech (Fagus sylvatica L.).

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Suppression subtractive hybridization (SSH) was performed to isolate cDNAs representing genes that are differentially expressed in leaves of Fagus sylvatica upon ozone exposure. 1248 expressed sequence tags (ESTs) were obtained from 2 subtractive libraries containing early and late ozone-responsive

Effects of drought and canopy ozone exposure on antioxidants in fine roots of mature European beech (Fagus sylvatica).

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We quantified ascorbate, glutathione and alpha-tocopherol in fine roots of mature Fagus sylvatica L. under free-air canopy ozone (O(3)) exposure (twice ambient O(3) concentration, 2x[O(3)]) during two growing seasons that differed in the extent of summer drought (exceptional drought year 2003,

Tree age dependence and within-canopy variation of leaf gas exchange and antioxidative defence in Fagus sylvatica under experimental free-air ozone exposure.

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We characterized leaf gas exchange and antioxidative defence of two-year-old seedlings and 60-year-old trees of Fagus sylvatica exposed to ambient (1 x O3) or two-fold ambient (2 x O3) O3 concentrations (maximum of 150 ppb) in a free-air canopy exposure system throughout the growing season. Decline

Antioxidative defence of old growth beech (Fagus sylvatica) under double ambient O3 concentrations in a free-air exposure system.

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In this study the influence of chronic free-air ozone exposure and of different meteorological conditions in the very dry year 2003 and the more humid year 2004 on the antioxidative system in sun and shade leaves of adult FAGUS SYLVATICA trees were investigated. Contents of ascorbate, glutathione,

Xylem sap composition of beech (Fagus sylvatica L.) trees: seasonal changes in the axial distribution of sulfur compounds.

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During different phases of the annual growth cycle, xylem sap was collected from trunk segments of adult beech (Fagus sylvatica L.) trees by the water displacement technique. Irrespective of the height of the trunk, both sulfate and reduced sulfur compounds were detected in the xylem sap throughout

Production and scavenging of reactive oxygen species in Fagus sylvatica seeds during storage at varied temperature and humidity.

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The accumulation of reactive oxygen species (ROS) in seed tissues plays an important role in the loss of seed viability during storage. In the present study, we examined whether the loss of germination capacity and viability of beech (Fagus sylvatica L.) seeds during storage under different

Gas exchange and antioxidative compounds in young beech trees under free-air ozone exposure and comparisons to adult trees.

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Three-year-old beech (Fagus sylvatica) seedlings growing in containers were placed into the sun and shade crown of a mature beech stand exposed to ambient (1 x O(3)) and double ambient (2 x O(3)) ozone concentrations at a free-air exposure system ("Kranzberg Forst", Germany). Pigments,

Evidence that branch cuvettes are reasonable surrogates for estimating O3 effects in entire tree crowns.

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Within the scope of quantifying ozone (O(3)) effects on forest tree crowns it is still an open question whether cuvette branches of adult trees are reasonable surrogates for O(3) responses of entire tree crowns and whether twigs exhibit autonomy in defense metabolism in addition to carbon autonomy.

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