A5069776424- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Photosynthetic Processes and Mechanisms
- Forest ecology and management
- Peatlands and Wetlands Ecology
- Plant Stress Responses and Tolerance
- Bioenergy crop production and management
- Soil Carbon and Nitrogen Dynamics
- Agroforestry and silvopastoral systems
- African Botany and Ecology Studies
- Botany and Plant Ecology Studies
- Plant Parasitism and Resistance
- Tree-ring climate responses
- Agriculture and Rural Development Research
- Geology and Paleoclimatology Research
- Plant responses to water stress
- Isotope Analysis in Ecology
- Plant and Biological Electrophysiology Studies
- Plant biochemistry and biosynthesis
- Ecology and Vegetation Dynamics Studies
- Horticultural and Viticultural Research
- Bryophyte Studies and Records
- Forest Management and Policy
- Mycorrhizal Fungi and Plant Interactions
- French Urban and Social Studies
Université de Lorraine
2006-2023
Silva
2021-2023
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2021-2023
AgroParisTech
2018-2023
Ecologie et Ecophysiologie Forestières
2006-2017
Écologie, Systématique et Évolution
2011
Universitat de Barcelona
2009
Bielefeld University
2007-2009
Université Paris-Sud
2006-2007
Université Paris-Saclay
2006-2007
The study of the fate assimilated carbon in respiratory fluxes field is needed to resolve residence and transfer times atmosphere–plant–soil system forest ecosystems, but it requires high frequency measurements isotopic composition evolved CO2. We developed a closed transparent chamber label whole crown tree labelling capable delivering 3-h pulse 99% 13CO2 field. compositions trunk soil CO2 effluxes were recorded continuously on two labelled one control trees by tuneable diode laser...
Abstract. Soil CO2 efflux is the main source of from forest ecosystems and it tightly coupled to transfer recent photosynthetic assimilates belowground their metabolism in roots, mycorrhiza rhizosphere microorganisms feeding on root-derived exudates. The objective our study was assess patterns carbon allocation among tree species along seasons. Pure 13CO2 pulse labelling entire crown three different (beech, oak pine) carried out at distinct phenological stages. Excess 13C soil tracked using...
The first broad species survey of diurnal variation in carbon (C) isotope signatures leaf dark-respired CO(2) (delta(13)C(res)) is presented here and functional differences dynamics are linked to fractionation different respiratory pathways, based on (13)C-labelling experiments. delta(13)C(res) was analysed with a rapid in-tube incubation technique 16 species. A large increase (4-8 per thousand) occurred evergreen, slow-growing aromatic correlated significantly cumulative photosynthesis,...
Phloem failure has recently been recognized as one of the mechanisms causing tree mortality under drought, though direct evidence is still lacking. We combined 13C pulse-labelling 8-year-old beech trees (Fagus sylvatica L.) growing outdoors in a nursery with an anatomical study phloem tissue their stems to examine how drought alters carbon transport and capacity. For six predawn leaf water potential ranged from -0.7 -2.4 MPa, compared average -0.2 MPa five control no stress. also observed...
13 CO2 pulse-labelling experiments were performed in situ on adult beeches (Fagus sylvatica) and pines (Pinus pinaster) at different phenological stages to study seasonal interspecific short-term dynamics partitioning of recently assimilated carbon (C) leaves. Polar fraction (PF, including soluble sugars, amino acids organic acids) starch purified from foliage sampled during a 10-d chase period. C contents, isotopic compositions parameters determined bulk foliage, PF starch. Decrease amount...
The cytoplasmic male sterile II (CMSII) mutant lacking complex I of the mitochondrial electron transport chain has a lower photosynthetic activity but exhibits higher rates excess than wild type (WT) when grown at high light intensity. In order to examine cause and determine whether electrons are consumed by photorespiration, light, intercellular CO(2), molar fraction (c(i)) response curves carbon assimilation were measured varying oxygen fractions. While is major acceptor for in CMSII WT...
Abstract Recent advances in understanding the metabolic origin and temporal dynamics δ 13 C of dark‐respired CO 2 ( res ) have led to an increasing awareness importance plant isotopic fractionation respiratory processes. Pronounced been observed a number species three main hypotheses proposed: first, diurnal changes substrates; second, post‐photosynthetic discrimination pathways; third, dynamic decarboxylation enriched carbon pools during post‐illumination respiration period. Since different...
Trees will have to cope with increasing levels of CO2 and ozone in the atmosphere. The purpose this work was assess whether lignification process could be altered wood poplars under elevated and/or ozone. Young were exposed either charcoal-filtered air (control), (800 μl l−1), (200 nl l−1) or a combination controlled chambers. Lignification analysed at different levels: biosynthesis pathway activities (enzyme transcript), lignin content, capacity incorporate new assimilates by using 13C...
The CMSII mutant of Nicotiana sylvestris, which lacks a functional mitochondrial complex I, was used to investigate chloroplast–mitochondria interactions in light acclimation photosynthetic carbon assimilation. and wild-type (WT) plants were grown at 80 μmol m−2 s−1 active radiation (PAR; 80) 350 PAR (350). Carbon assimilation saturating PFD markedly higher WT leaves as compared with leaves, but similar CMS suggesting that the is unable adjust photosynthesis growth irradiance. showed several...
The observed decrease in respiration during rosette leaf maturation of Nicotiana sylvestris wild‐type (WT) plants was shown to be because a decline the cytochrome oxidase (COX) pathway activity, measured by 18 O/ 16 O oxygen discrimination, while alternative (AOX) remained stable. This suggests higher contribution COX growth than maintenance respiration. Mitochondrial superoxide dismutase (MnSOD) activity paralleled with age, whereas chloroplastic FeSOD increased. Age‐dependent respiratory...
Nicotiana sylvestris leaves challenged by the bacterial elicitor harpin N(Ea) were used as a model system in which to determine respective roles of light, oxygen, photosynthesis, and respiration programmed cell death response plants. The appearance markers, such membrane damage, nuclear fragmentation, induction stress-responsive element Tnt1, was observed all conditions. However, process delayed dark compared with despite similar accumulation superoxide hydrogen peroxide chloroplasts. In...
Abstract Estimating symbiotic di‐nitrogen (N 2 ) fixation is challenging, especially when working with woody N fixers in field trials. Fortunately, isotope methods based on 15 natural abundance or artificial enrichment (dilution method) make it possible to estimate the proportion of nitrogen derived from atmosphere (Ndfa) ‐fixing species. These have been extensively used for herbaceous species, much less tree species such as alder and acacia, rarely black locust ( Robinia pseudoacacia ). The...
In a global context where water will become scarce resource under temperate latitudes, managing tree plantations with species associations, i.e., forest mixture or agroforestry, could play major role in optimizing the sustainable use of this resource. Conceptual frameworks community ecology suggest that, mixed plantations, environmental resources such as may be more efficiently used for carbon acquisition and growth thanks to niche complementarity among species. To test hypotheses behind...
Tree growth and survival are dependent on their ability to perceive signals, integrate them, trigger timely fitted molecular responses. While ectomycorrhizal symbiosis is a predominant tree-microbe interaction in forest ecosystems, little known about how what extent it helps trees cope with environmental changes. We hypothesized that the presence of Laccaria bicolor influences abiotic cue perception by Populus trichocarpa ensuing signaling cascade. submitted or non-ectomycorrhizal P....
The issues of whether, where, and to what extent carbon isotopic fractionations occur during respiration affect interpretations plant functions that are important many disciplines across the natural sciences. Studies fractionation dark in C3 plants have repeatedly shown respired CO2 be 13C enriched relative its bulk leaf sources depleted root sources. Furthermore, two studies showed become progressively ontogeny legumes. As such data on C4 scarce contradictory, we investigated apparent...
Abstract. Soil CO2 efflux is the main source of from forest ecosystems and it tightly coupled to transfer recent photosynthetic assimilates belowground their metabolism in roots, mycorrhiza rhizosphere microorganisms feeding on root-derived exudates. The objectives our study were assess patterns carbon allocation among tree species along seasons. Pure 13CO2 pulse labelling entire crown three different (beech, oak pine) was carried out at distinct phenological stages. Excess 13C soil tracked...