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Potential vulnerability of oak forests to climate change-induced flooding: effects of mild oxygen deficiency on Quercus robur and Quercus petraea seedling physiology.

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Flooding is characterized by saturation of soil pores with water, leading to hypoxic conditions which affect plant root development and metabolism. We investigated the oxygen deficiency tolerance observed in Quercus robur and Quercus petraea and seek to understand whether it can be explained by

Bark and woody tissue photosynthesis: a means to avoid hypoxia or anoxia in developing stem tissues

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In woody plants, oxygen transport and delivery via the xylem sap are well described, but the contribution of bark and woody tissue photosynthesis to oxygen delivery in stems is poorly understood. Here, we combined stem chlorophyll fluorescence measurements with microsensor quantifications of bark O2

Molecular cloning and characterization of calmodulin genes in young oak seedlings (Quercus petraea L.) during early flooding stress.

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As part of an integrated study on the molecular response of woody plants to flooding, three CaM genes were isolated from oak seedlings (Quercus petraea Liebl.) and characterized. QpCaM-1 was almost exclusively expressed in roots, whereas QpCaM-2 and -3 were more evenly distributed throughout the

Intra- and interspecific diversity in the response to waterlogging of two co-occurring white oak species (Quercus robur and Q. petraea).

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Quercus robur L. and Quercus petraea (Matt.) Liebl. are sympatric oak species with different ecological requirements. Quercus robur is more tolerant to waterlogging than Q. petraea. This ecological divergence may play a role in the maintenance of the two species despite the absence of an

Acetaldehyde and ethanol biosynthesis in leaves of plants.

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Leaves of terrestrial plants are aerobic organs, and are not usually considered to possess the enzymes necessary for biosynthesis of ethanol, a product of anaerobic fermentation. We examined the ability of leaves of a number of plant species to produce acetaldehyde and ethanol anaerobically, by

Hydraulic conductivity of red oak (Quercus rubra L.) leaf tissue does not respond to light.

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The permeability of leaf tissue to water has been reported to increase under illumination, a response reputed to involve aquaporins. We studied this 'light response' in red oak (Quercus rubra L.), the species in which the phenomenon was first detected during measurements of leaf hydraulic

Implication of the suberin pathway in adaptation to waterlogging and hypertrophied lenticels formation in pedunculate oak (Quercus robur L.).

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Waterlogging causes stressful conditions for perennial species. The temporary overabundance of water in waterlogged soil can induce hypoxia in the rhizosphere, leading to root death, tree decline and even dieback. Two closely related members of the European white oak complex, pedunculate (Quercus

Contrasting growth and adaptive responses of two oak species to flooding stress: role of non-symbiotic haemoglobin.

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Soil flooding is an environmental constraint that is increasingly important for forest ecosystems, affecting tree growth and regeneration. As a result, selection pressure will alter forest diversity and distribution by favouring tree species tolerant of soil oxygen deprivation. Sessile and

A novel nonsymbiotic hemoglobin from oak: cellular and tissue specificity of gene expression.

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This study presents the isolation and characterization of a novel nonsymbiotic Hb gene from sessile oak (Quercus petraea) seedlings, herein designated QpHb1. The cellular and tissue expression of QpHb1 was analysed by Northern blotting and in situ hybridization. The encoded protein was predicted to

Role of waterlogging-responsive genes in shaping interspecific differentiation between two sympatric oak species.

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Pedunculate (Quercus robur L.) and sessile oak (Quercus petreae Matt. Liebl.) are closely related species with a widely sympatric distribution in Europe. These two oak species are also known to display different ecological features, particularly related to their adaptation to soil waterlogging.

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Herbal & Natural Medicine

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