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Relationships between photosynthetic capacity, and needle contents of N, Rubisco and amino acids were investigated in potted Pinus sylvestris L. trees. Three-year-old seedlings of P. sylvestris were grown for 4years with three nutrient regimes. Concentrations of N, amino acids, amides and Rubisco were measured and expressed on a needle area basis, and the in vivo performances of Rubisco (maximum rate...
Leaf cytokinins (CKs) were profiled within four locations throughout the inner and outer layers of a mature sugar maple (Acer saccharum) canopy. Leaf CK was associated with leaf gas exchange activity and some corresponding microclimate variables. Both inner and outer layers in the upper canopy had higher concentrations of leaf CKs than the lower canopy layers and the difference was comprised primarily...
Permanent xylem blockage is a common result of attacks by herbivores and fungi. The mitosporic fungus Phoma tracheiphila (Petri) Kantschaveli et Gikachvili, is the agent of a Citrus tracheomycosis (“malsecco disease”) causing xylem impairment and leading to leaf shedding and plant dieback. In the present study, this pathogen was used for monitoring the effects of increasing levels of stem hydraulic...
Diurnal fluctuations of leaf water isotope ratios (δ18O and δD) were measured for Jeffrey (Pinus jeffreyi Balf.) and lodgepole (Pinus contorta Douglas ex Louden) pine. Two trees per species were sampled every few hours on 15–16 October 2005 and 19–20 June 2006. Diurnal gas exchange was measured during the summer sampling. In fall 2005, leaf water δ18O ranged from 0.7 to 9.0‰, and leaf water δD ranged...
We analyzed the differences between irrigated and non-irrigated plants of three congeneric Styrax species that present distinct distribution patterns in the physiognomies of the Cerrado vegetation in Brazil. Styrax ferrugineus showed a stomatal conductance (gs) unresponsive to soil water deficit in potted plants. This may explain the high gas exchange and photochemical efficiency found in this species,...
Key message Pterocarpus officinalisis able to (1) improve its acclimation capacity if soil salinity increases slowly and (2) benefit from afreshwater episode. Abstract One likely effect of global change is an increase of the amplitude of salt variations in the soil of brackish coastal wetland forests. In the Antilles, such forests are dominated by the species Pterocarpus officinalis. The study...
Key message Under increasing short-term drought stress,E. camaldulensisplantlets showed reduced stomatal conductance, then decreased carboxylation efficiency, and finally, reduced quantum efficiency of photosynthesis and chlorophyll content. Abstract We evaluated the physiological responses of a drought-tolerant (DT) clone and a drought-sensitive (DS) clone of Eucalyptus camaldulensis to drought...
Key message Initial stomatal conductance at onset of illumination and lag times before stomata start to open in response to light are decisive for the whole course of photosynthetic induction. Neglecting these effects can reverse results when comparing induction parameters within and between species. Abstract We analyzed stomatal behaviors, the role of initial stomatal conductance (at onset of light,...
Key messageThe more stomata affect photosynthetic induction courses, the stronger the influence of leaf temperature on the induction parameters becomes. Initial stomatal conductances relative to species-specific stomatal thresholds explain seemingly contradictory response patterns. Abstract We analyzed the effects of leaf temperature, Tleaf (at simultaneously altered leaf-to-air vapor concentration...
Key message We analyzed the response ofVochysia divergensPohl trees to hydrological variation over seasons in a Brazilian wetland-based 26 physiological parameters. Dryseason conditions had a greater effect on the photosynthetic function than those in the wet season. Abstract Plants in seasonal wetlands are subject to large hydrological fluctuations and the physiological trade-offs that occur during...
Key message In terms of some specifics parameters, Eucalyptus and savanna trees were characterized by similar responses of resource use under field conditions. Remarkably, young eucalypt exhibited greater photosynthetic capacity, primarily in the dry season. Abstract Although a growing demand for paper and pulp is enhancing pressure for land use to increase eucalypt plantations in tropical savanna...
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