A5005833795- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Atmospheric chemistry and aerosols
- Forest ecology and management
- Ecology and Vegetation Dynamics Studies
- Atmospheric and Environmental Gas Dynamics
- Photosynthetic Processes and Mechanisms
- Silicon Effects in Agriculture
- Geology and Paleoclimatology Research
- Plant Stress Responses and Tolerance
- Archaeological and Geological Studies
- Atmospheric Ozone and Climate
- Forest Management and Policy
- Plant Molecular Biology Research
- Fire effects on ecosystems
- Remote Sensing and LiDAR Applications
- Indoor Air Quality and Microbial Exposure
- Enzyme function and inhibition
- Tree-ring climate responses
- Sustainability and Ecological Systems Analysis
- Urban Green Space and Health
- Hemoglobin structure and function
- Marine and environmental studies
- Environmental Impact and Sustainability
- Plant biochemistry and biosynthesis
Centre National de la Recherche Scientifique
2012-2025
Environnements et Paléoenvironnements Océaniques et Continentaux
2016-2024
Centre Paul Albert-Février
2020-2023
Centre de Recherche et d’Enseignement de Géosciences de l’Environnement
2016-2022
Laboratoire de Recherche Scientifique
2022
Hôpital Saint-Michel
2021
Aix-Marseille Université
2011-2014
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2007-2014
Centre National pour la Recherche Scientifique et Technique (CNRST)
2014
Observatoire de Haute-Provence
2014
ABSTRACT Carbonic anhydrases (CAs) are Zn‐containing metalloenzymes that catalyse the reversible hydration of CO 2 . We investigated α CA and β families in Arabidopsis , which contain eight αCA ( AtαCA1‐8 ) six genes AtβCA1‐6 ). Analyses expressed sequence tags (ESTs) from The Information Resource (TAIR) database indicate all encoding sequences, but only three At CA, expressed. Using semi‐quantitative PCR experiments, functional were more strongly green tissue, strong expression was also...
Hydrogen photoproduction by eukaryotic microalgae results from a connection between the photosynthetic electron transport chain and plastidial hydrogenase. Algal H2 production is transitory phenomenon under most natural conditions, often viewed as safety valve protecting overreduction. From colony screening of an insertion mutant library unicellular green alga Chlamydomonas reinhardtii based on analysis dark-light chlorophyll fluorescence transients, we isolated impaired in cyclic flow...
Summary A major challenge of current ecological research is to determine the responses plant and animal communities ecosystem processes future environmental conditions. Ecosystems respond climate change in complex ways, outcome may significantly depend on biodiversity. We studied relative effects enhanced drought species mixture soil biota litter decomposition a Mediterranean oak forest. experimentally reduced precipitation, accounting for seasonal precipitation variability, created...
Abstract Cytosolic/nuclear molecular chaperones of the heat shock protein families HSP90 and HSC70 are conserved essential proteins in eukaryotes. These have essentially been implicated innate immunity abiotic stress tolerance higher plants. Here, we demonstrate that both recruited Arabidopsis (Arabidopsis thaliana) for stomatal closure induced by several environmental signals. Plants overexpressing HSC70-1 or with reduced HSP90.2 activity compromised dark-, CO2-, flagellin 22 peptide-,...
Improved global estimates of terrestrial photosynthesis and respiration are critical for predicting the rate change in atmospheric CO(2). The oxygen isotopic composition CO(2) can be used to estimate these fluxes because exchange between water creates distinct flux signatures. enzyme carbonic anhydrase (CA) is known accelerate this leaves, but possibility CA activity soils commonly neglected. Here, we report widespread accelerated soil hydration. Exchange was 10-300 times faster than...
Abstract. The CANOPEE project aims to better understand the biosphere–atmosphere exchanges of biogenic volatile organic compounds (BVOCs) in case Mediterranean ecosystems and impact in-canopy processes on atmospheric chemical composition above canopy. Based an intensive field campaign, objective our work was determine air inside a canopy as well net fluxes reactive species between boundary layer. Measurements were carried out during spring 2012 at site Oak Observatory Observatoire de Haute...
Isolation of Arabidopsis mutants that maintain stomata open all night long credits the existence dedicated regulators for stomatal closure in darkness.
In the context of global warming, which is mainly due to increasing atmospheric concentration carbon dioxide, prediction climate change requires a good assessment involvement vegetation in cycle. particular, determining when vegetative activity ceases deciduous forests remains great challenge. Remote sensing solar-induced fluorescence (SIF) has been considered as potential proxy for ecosystem photosynthesis and, therefore, relevant indicator end period compared other indices, such EVI...
Climate change-induced drought threatens forest restoration by limiting seedling establishment. To address this, we designed synthetic microbial communities (SynComs) to enhance tolerance in Quercus pubescens and Sorbus domestica. Bacteria were isolated from distinct soil compartments depths, based on legacy effects. Functional characterization revealed compartment-specific traits, including exopolysaccharide production, auxin abscisic acid biosynthesis, siderophore osmotic tolerance. We...
Abstract: A concept is presented for analysing and quantifying the competitiveness of woody plants. Efficiency ratios are defined that relate resource investments gains to above‐ belowground space sequestration. Such efficiencies exemplified in comparisons between young mature trees European beech (Fagus sylvatica) Norway spruce (Picea abies), resulting remarkable consistencies across plant age species. The demonstration extends assessments inter‐ intra‐specific competition plants a...
Abstract. At a local level, biogenic isoprene emissions can greatly affect the air quality of urban areas surrounded by large vegetation sources, such as in Mediterranean region. The impacts future warmer and drier conditions on from emitters are still under debate. Seasonal variations Quercus pubescens gas exchange emission rates (ER) were studied June 2012 to 2013 at O3HP site (French Mediterranean) natural (ND) amplified (AD, 32 %) drought. While AD significantly reduced stomatal...
We measured gas exchange and various leaf parameters of ash (Fraxinus angustifolia Vahl.) oak (Quercus robur L.) in the high canopy lime (Tilia cordata Mill.) lower a planted, 120-year-old floodplain forest southern Moravia, Czech Republic. The high-canopy leaves F. Q. had nitrogen concentrations on area basis (Narea) that were twice those low-canopy T. cordata. Upper-canopy photosynthetic rate at light saturation (Amax) about 16 μmol CO2 m−2 s−1, whereas Amax upper-canopy foliage achieved...
The broad range in plant responses to chronic O3 exposure compels a search for integrative, underlying principles. One such approach is the unifying theory proposed by Reich (1987), which combines response of contrasting physiognomic classes plants on basis their intrinsic leaf diffusive conductance and, hence, capacity uptake. Physiognomic differ proportional decline photosynthesis and growth when compared cumulative per unit time, but converge uptake time or over entire lifetime leaf....
The detection of solar induced chlorophyll fluorescence (SIF) in the field with spectrometers is based on depth Fraunhofer or oxygen absorption lines upwelling radiance compared to that downwelling irradiance. This relative enables differentiation SIF from reflected radiation. Recent studies have shown if bands are used retrieve tower-based measurements, then atmospheric correction required. study presents a band shape fitting (BSF) approach both optical path length (deepening) and...
Abstract. The role that soil, foliage, and atmospheric dynamics have on surface carbonyl sulfide (OCS) exchange in a Mediterranean forest ecosystem southern France (the Oak Observatory at the Observatoire de Haute Provence, O3HP) was investigated June of 2012 2013 with essentially top-down approach. Atmospheric data suggest site is appropriate for estimating gross primary production (GPP) directly from eddy covariance measurements OCS fluxes, but it less adequate scaling net (NEE) to GPP...
Abstract. Triple oxygen isotopes (17O-excess) of water are useful to trace evaporation at the soil–plant–atmosphere interface. The 17O-excess plant silica, i.e., phytoliths, inherited from leaf water, was previously calibrated in growth chambers as a proxy atmospheric relative humidity (RH). Here, using model–data approach, we examine parameters that control triple isotope composition bulk grass and phytoliths natura, O3HP experimental platform located French Mediterranean area. A plot...
Increasing aridity in the Mediterranean region will result longer and recurrent drought. These changes could strongly modify plant defenses, endangering tree survival. We investigate response of chemical defenses from central specialized metabolism Quercus pubescens Willd. to future drought using a long-term experiment natura where trees have been submitted amplified (~ –30% annual precipitation) since April 2012. focused on leaf metabolites including chlorophylls carotenoids (central...