An increase in temperature along with a decrease in summer precipitation in Central Europe will result in an increased frequency of drought events and gradually lead to a change in species composition in forest ecosystems. In the present study, young oaks (Quercus robur L. and Quercus petraea (Matt.) Liebl.) were transplanted into large mesocosms and exposed for 3 years to experimental warming ...

A portable unilateral nuclear magnetic resonance (NMR) instrument was used to detect in field conditions the water status of leaves of herbaceous crops (Zea mays, Phaseolus vulgaris), mesophyllous trees (Populus nigra), and natural Mediterranean vegetation characterized by water-spending shrubs (Cistus incanus) and water-saving sclerophyllous trees (Quercus ilex). A good relationship was observ...

/?-Glucogallin, Digalloyl-/?-D-glucose, Trigalloyl-/?-D-glucose, G alloyltransferase, G allotannin Biosynthesis, Quercus robur Cell-free extracts from oak (Quercus robur) leaves were found to contain at least two /?-glucogallin-dependent galloyltransferases. One enzyme catalyzed a rap id exchange o f the galloylm oiety o f /?-glucogallin with free glucose. A second enzym e fraction was show n t...

BACKGROUND AND AIMS Deciduous trees have a seasonal carbon dioxide exchange pattern that is attributed to changes in leaf biochemical properties. However, it is not known if the pattern in leaf biochemical properties - maximum Rubisco carboxylation (V(cmax)) and electron transport (J(max)) - differ between species. This study explored whether a general pattern of changes in V(cmax), J(max), and...

Purpose: The aim of the present study was to investigate the wound healing activity of the selected Indian medicinal plant Quercus infectoria. Method: Ethanol extract of the shade-dried leaves of Quercus infectoria was studied for its effect on wound healing in rats, using incision, excision and dead-space wound models, at two different dose levels of 400 and 800 mg/kg. Result: The plant showed...

Multivariate methods have been widely used for revealing the structures of communities, and in this paper we explore one particular method, namely correspondence analysis (also called reciprocal averaging) for studying humus profiles by the 'method of small volumes'. The present study was done on humus profiles under holm oak (Quercus rotundifolia), an evergreen Mediterranean species, in the Hi...

A total of 139 reflectance spectra (between 350 and 2500 nm) from coast live oak (Quercus agrifolia) leaves were measured in the laboratory with a spectrometer FieldSpecAPro FR. Correlation analysis was conducted between absorption features, three-band ratio indices derived from the spectra and corresponding relative water content (RWC, %) of oak leaves. The experimental results indicate that t...

In this study three species of the genus Quercus section Erythrobulanus (Quercus coccinea, Quercus rubra, Quercus uelurina) were investigated. All occur together as canopy trees in forests of southern New England. Acorns of each Quercus species were planted in plots located in five zones that represent a range of forest gap/canopy conditions that can occur within a southern New England forest. ...