A5084258096- Photosynthetic Processes and Mechanisms
- Remote Sensing in Agriculture
- Plant Water Relations and Carbon Dynamics
- Light effects on plants
- Plant responses to elevated CO2
- Spectroscopy and Quantum Chemical Studies
- Plant Stress Responses and Tolerance
- Leaf Properties and Growth Measurement
- Horticultural and Viticultural Research
- Photoreceptor and optogenetics research
- Plant and animal studies
- French Urban and Social Studies
- Multiculturalism, Politics, Migration, Gender
- African Studies and Ethnography
- Atmospheric and Environmental Gas Dynamics
- Plant Gene Expression Analysis
- Marine and coastal ecosystems
- Urban Heat Island Mitigation
- Spectroscopy and Laser Applications
- Remote Sensing and LiDAR Applications
- Atmospheric Ozone and Climate
- Aging, Elder Care, and Social Issues
- Algal biology and biofuel production
- Spectroscopy and Chemometric Analyses
- Land Use and Ecosystem Services
École Polytechnique
2009-2023
Laboratoire d'ethnologie et de sociologie comparative
2015-2023
Centre National de la Recherche Scientifique
2006-2023
Sorbonne Université
2017-2022
École Normale Supérieure - PSL
2022
Laboratoire de Météorologie Dynamique
2009-2020
Institut Pierre-Simon Laplace
2019
Sorbonne Paris Cité
2017
Polytechnique Montréal
2017
Universitat de les Illes Balears
2002-2012
Water stress experiments were performed with grapevines ( Vitis vinifera L.) and other C 3 plants in the field, potted laboratory, detached leaves. It was found that, all cases, ratio of steady state chlorophyll fluorescence (Fs) normalized to dark‐adapted intrinsic (Fo) inversely correlated non‐photochemical quenching (NPQ). Also, at high irradiance, Fs/Fo positively CO 2 assimilation air, electron transport rate calculated from fluorescence, stomatal conductance, but no clear correlation...
The early light-induced proteins (ELIPs) belong to the multigenic family of light-harvesting complexes, which bind chlorophyll and absorb solar energy in green plants. ELIPs accumulate transiently plants exposed high light intensities. By using an Arabidopsis thaliana mutant ( chaos ) affected posttranslational targeting complex-type thylakoids, we succeeded suppressing rapid accumulation during high-light stress, resulting leaf bleaching extensive photooxidative damage. Constitutive...
Abstract In this study a method was designed to assess non‐destructively the type of UV‐screening compounds present in leaf epidermis. The is based on recording and calculation ratio UV‐excitation spectra chlorophyll fluorescence (FER) from adaxial abaxial sides bifacial leaves, or older younger segments monocotyledonous leaves. logarithm (logFER) matched absorption spectrum UV‐absorbers leaf, as confirmed by its overlap with methanolic extract isolated By using logFER approach, it possible...
Dualex (dual excitation) is a field-portable instrument, hereby described, for the assessment of polyphenolic compounds in leaves from measurement UV absorbance leaf epidermis by double excitation chlorophyll fluorescence. The instrument takes advantage feedback loop that equalizes fluorescence level induced reference red light to UV-light-induced level. This allows quick attached even under field conditions. use light-emitting diodes and leaf-clip configuration makes user-friendly with...
We have studied the time-resolved fluorescence properties of light-harvesting complexes (Lhc) photosystem II (Lhcb) in order to obtain information on mechanism energy dissipation (non-photochemical quenching) which is correlated conversion violaxanthin zeaxanthin excess light conditions. The chlorophyll decay Lhcb proteins LHCII, CP29, CP26, and CP24 detergent solution mostly determined by two lifetime components 1.2−1.5 3.6−4 ns while contribution faster component higher with respect LHCII....
This paper presents a field platform for continuous measurement of fluorescence at the canopy level. It consists 21-m-high crane equipped measurements. The is installed in middle fields dedicated to agricultural research. Thanks jib 24 m and railway 100 distance, measurements can be performed nadir viewing over various crops. development test future passive or active airborne space-borne vegetation sensors. A new fully automatic instrument, called TriFLEX, has been end jib. TriFLEX designed...
Abstract. The CEFLES2 campaign during the Carbo Europe Regional Experiment Strategy was designed to provide simultaneous airborne measurements of solar induced fluorescence and CO2 fluxes. It combined with extensive ground-based quantification leaf- canopy-level processes in support ESA's Candidate Earth Explorer Mission "Fluorescence Explorer" (FLEX). aim this test if signal detected from an platform can be used improve estimates plant mediated exchange on mesoscale. Canopy quantified four...
Sun-induced chlorophyll fluorescence (SIF) is a radiation flux emitted by molecules in the red (RSIF) and far region (FRSIF), considered as potential indicator of functional state photosynthesis remote sensing applications. Recently, ground studies space observations have demonstrated strong empirical linear relationship between FRSIF carbon uptake through (GPP, gross primary production). In this study, we investigated RSIF to represent status at canopy level on wheat crop. were continuously...
ABSTRACT Chlorophyll (Chl) and epidermal polyphenol (EPhen) contents were estimated in vivo using two optical leaf‐clips, SPAD‐502 Dualex, respectively. The area‐based measurements transformed into mass‐based data by taking account the leaf dry mass per area (LMA). Measurements performed on forest trees saplings grown under controlled conditions. While LMA increased with irradiance along a vertical transect beech canopy or different increasing levels, EPhen (EPhen m ) increased, whereas Chl...
A field platform dedicated to fluorescence measurements (INRA, Avignon, France) was used monitor the emission of a sorghum during its growing period. The were performed continuously at canopy level, from seeding maturity. passive instrument based on three spectrometers evolution fluxes and vegetation indexes such as Photochemical Reflectance Index (PRI) Normalized Difference Vegetation (NDVI). Fluorescence retrieved radiances, using filling-in atmospheric oxygen absorption bands, 687 760 nm....
The effect of leaf temperature (T), between 23 and 4°C, on the chlorophyll (Chl) fluorescence spectral shape was investigated under moderate (200 μE m−2 s−1) low (30–35 light intensities in Phaseolus vulgaris Pisum sativum. With decreasing temperature, an increase yield at both 685 735 nm observed. A marked change occurred longer emission band resulting a decrease Chl ratio, F685/F735, with reducing T. Our analysis suggests that this is due to temperature-induced state 1–state 2 transition...