Erwin Dreyer

French National Institute for Agriculture, Food, and Environment (INRAE) | INRAE · Centre de Recherche de Nancy

Key Message Leaves of seedlings from five oak species ( Quercus robur L.; Q. pubescens L.; Q. suber L.; Q. afares Pomel; Q. ilex L.) displayed large, mainly inter-specific, differences in leaf mass-to-area ratio ( LMA ) and lignin content, as well as in the ¹³ C composition of bulk leaf biomass. The variation in leaf lignin content and LMA did not...

The genus Quercus L. has a problematic taxonomy because of widespread hybridization among them. Its shows highest morphological variations among species and populations (Kremer and Petit, 1993). This study is part of a general research work on the characterizations and variabilities of two co-occurring Quercus species-one deciduous (Quercus canarie...

The year 2022 was a time of great changes in Annals of Forest Science. We moved from a hybrid to a full Open Access publication model with BMC-Springer. This means that our authors are full owners of the articles , at the price of a quite moderate article processing charges (APC) which is sometimes covered by general agreements between institutions...

Quercus suber) ‫العمر‬ ‫من‬ ‫تبلغ‬ 6 ‫وتنتم‬ ‫أصص‬ ‫في‬ ‫مزروعة‬ ‫أشهر‬ ‫إلى‬ ‫ي‬ ‫التونسية‬ ‫البالد‬ ‫من‬ ‫موقعين‬ ‫من‬ ‫مأخوذة‬ ‫طبيعيتين‬ ‫مجموعتين‬ : " ‫الجوزا‬ " ‫و‬ ‫عال)‬ ‫(ارتفاع‬ " ‫يف‬ ّ ‫بل‬ " ‫منخفض).‬ ‫(ارتفاع‬ ‫لمدة‬ ‫الكامل‬ ‫الشمس‬ ‫ضوء‬ ‫في‬ ‫الشتالت‬ ‫نمت‬ ‫وقد‬ 4 ‫ثالثة‬ ‫عليها‬ ‫تسلط‬ ‫أن‬ ‫قبل‬ ‫أشهر‬ ‫مظ‬ ‫تحت‬ ‫ونظامين‬ ‫الكا...

We have the pleasure to announce here a new step in the already long history of Annals of Forest Science (formerly Annales des Sciences Forestières, founded 1964). Since January 1, 2022, Annals of Forest Science is published under a full open access model. It joins two other INRAE journals within the BMC-Springer Open Access publishing scheme: Vete...

Eight years of studying coffee ecophysiology and monitoring ecosystem services (ES) in a large coffee farm in Costa Rica revealed several practical recommendations for farmers and policy makers. The cropping system studied within our collaborative observatory (Coffee-Flux) corresponds to a coffee-based agroforestry system (AFS) under the shade of l...

• Key message A recent paper by Ceccherini et al.( 2020a ) reported an abrupt increase of 30% in the French harvested forest area in 2016–2018 compared to 2004–2015. A re-analysis of their data rather led us to conclude that, when accounting for the singular effect of storm Klaus, the rate of change in harvested area depended on the change year use...

Bud-burst and leaf-senescence determine the length of the growing season for deciduous trees and therefore the duration of potential carbon assimilation with consequences on biomass production. In Fagus sylvatica L., leaf phenology depends on both photoperiod and temperature. The future climate is expected to induce more frequent soil water deficit...

Plant populations can undergo very localized adaptation, allowing widely distributed populations to adapt to divergent habitats in spite of recurrent gene flow. Neotropical trees –whose large and undisturbed populations often span a variety of environmental conditions and local habitats – are particularly good models to study this process. Here, we...

A large variability of water use efficiency (assessed from the carbon isotopic discrimination in leaves and leaf soluble sugars) has been detected among poplar genotypes. Checking whether such differences detected in young trees (1-2 years old) remain stable with tree age is a prerequisite to use this trait with confidence for breeding purposes. In...

The temperature response of photosynthesis is one of the key factors determining predicted responses to warming in global vegetation models (GVMs). The response may vary geographically, owing to genetic adaptation to climate, and temporally, as a result of acclimation to changes in ambient temperature. Our goal was to develop a robust quantitative...

Plant populations can undergo very localized adaptation, allowing widely distributed populations to adapt to divergent habitats in spite of recurrent gene flow. Neotropical trees whose large and undisturbed populations often span a variety of environmental conditions and local habitats are particularly good models to study this process. Here, we ca...

Plant populations are able to undergo very localized adaptive processes, that allow continuous populations to adapt to divergent habitats in spite of recurrent gene flow. Here, we carried out a genome scan for selection through whole-genome sequencing of pools of populations, sampled according to a nested sampling design, to evaluate microgeographi...

Eight years of monitoring ecophysiology and ecosystem services (ES) in a large coffee farm of Costa Rica yields a range of practical applications for the farmer and stakeholders, thanks to numerous scientific actors and disciplines contributing to our collaborative observatory (Coffee-Flux). • A lot of ecosystem services depend on the soil properti...

In agroforestry systems, shade trees strongly affect the physiology of the undergrown crop. However, a major paradigm is that the reduction in absorbed photosynthetically active radiation is, to a certain extent, compensated by an increase in light‐use efficiency, thereby reducing the difference in net primary productivity between shaded and non‐sh...

variability in leaf morphology between adult trees and seedlings of two species of oak (Quercus canariensis Willd.) and (Quercus suber L.) and their hybrid (Quercus afares Pomel) in NorthWestern Tunisia Variabilité interspécifique de la morphologie des feuilles entre les arbres adultes et les semis de deux espèces de chêne, (Quercus canariensis Wil...

· Key messageWe observed coordinated differences in water-use efficiency,13C isotope composition, and whole-plant transpiration efficiency among nine Acacia species, although the up scaling from leaf to whole-plant level resulted in different relationships in Sahelian and Australian species. · ContextThe genus Acacia sensu lato contains a large var...

We are a multidisciplinary group of scientists who devoted their research efforts to the forest for many years. We are very concerned by the international debate on the contribution of sustainable forest management to climate change mitigation. Here we wish to inform the larger research community about our deep and converging criticism of the messa...

Annals of Forest Science is publishing a series of review papers to celebrate 50 years of activities as a journal in forest and wood science. The reviews emphasize the extent to which forest and wood sciences changed and developed as a large array of disciplines devoted to complex objects with sometimes many conflicting issues.

La gestion de la fertilité des sols forestiers est-elle à un tournant ? Une conclusion transitoire

Is the management of forest soil fertility at a turning point? A brief conclusion

Poplar genotypes differ in transpiration efficiency (TE) at leaf and whole-plant level under similar conditions. We tested whether atmospheric vapour pressure deficit (VPD) affected TE to the same extent across genotypes. Six Populus nigra genotypes were grown under two VPD. We recorded: (i) (13) C content in soluble sugars; (ii) (18) O enrichment...

Annals of Forest Science changes its scope and complies with green open access rules

Annals of Forest Science is an international journal that publishes papers describing basic and applied research about forest science in the context of global change. The scope covers following aspects: (i) biology of trees and associated organisms (symbionts, pathogens, pests); (ii) forest dynamics and ecosystem processes under environmental or m...

•Context Oak species display a large within-species diversity combined with significant gene flow between species. Quercus afares Pomel is an endemic species that grows as a small relict population in Northern Tunisia, together with Quercus suber L. and Quercus canariensis Willd. It is considered to be a fixed hybrid between the two latter. •Aims W...

Excel file containing the data that were used for this analysis

DOC 4930 kb

• Irradiance elicits a large plasticity in leaf traits, but little is known about the modulation of this plasticity by ontogeny. Interactive effects of relative irradiance and ontogeny were assessed on leaf traits for two tropical rainforest tree species: Dicorynia guianensis Amshoff and Tachigali melinonii (Harms) Barneby (Fabaceae, Caesalpinioide...

Under natural conditions, plants are subjected to continuous changes of irradiance that drive variations of stomatal conductance to water vapour (gs ). We propose a dynamic model to predict the temporal response of gs at the leaf level using an asymmetric sigmoid function with a unique parameter describing time constants for increasing and decreasi...

In agroforestry systems (AFS), quantifying the competition for light is a prerequisite toward understanding the impact of shade trees on the productivity of the under-crop. Models for homogeneous canopies and shade/full-sun approaches do not address the intra-plot heterogeneity, typical of AFS. For the first time, MAESTRA, a 3D light absorption mod...

The geography of coffee production will likely be affected in Central America due to climate changes. Coffee is known to be sensitive to high temperatures, affecting negatively flowering and fruit quality (DaMatta et al., 2008). Moreover, coffee is mainly cultivated by smallholders who are usually economically vulnerable and who have limited capaci...

Mesophyll diffusion conductance to CO(2) is a key photosynthetic trait that has been studied intensively in the past years. The intention of the present review is to update knowledge of g(m), and highlight the important unknown and controversial aspects that require future work. The photosynthetic limitation imposed by mesophyll conductance is larg...

(13) C discrimination between atmosphere and bulk leaf matter (Δ(13) C(lb) ) is frequently used as a proxy for transpiration efficiency (TE). Nevertheless, its relevance is challenged due to: (1) potential deviations from the theoretical discrimination model, and (2) complex time integration and upscaling from leaf to whole plant. Six hybrid genoty...

Mesophyll conductance to CO2 (g m) limits the diffusion of CO2 to the sites of carboxylation, and may respond rapidly (within minutes) to abiotic factors. Using three Eucalyptus species, we tested the rapid response of g m to irradiance under 21% and 1% O2. We used simultaneous measurements of leaf gas exchange and discrimination against 13CO2 with...

Coffee-based agroforestry systems display two heterogeneous plant layers (shade tree and coffee) both discontinuous, uneven-aged and subjected to sequential pruning. Many field experiments in coffee agroforestry research have been implemented to evaluate the impact of agricultural practices on coffee production, such as shade level, pruning managem...

The assessment of the effect of tree age on leaves is usually limited by the difficulty of sampling sun leaves from tall ageing trees. In this study, we investigated tree age-related effects on sun leaves in a chronosequence of beech (Fagus sylvatica L.) stands. The effects of stand age on leaf mass to area ratio (LMA), chlorophyll (Chl), epidermal...

Genetic differences in δ¹³C (isotopic composition of dry matter carbon) have been evidenced among poplar genotypes at juvenile stages. To check whether such differences were maintained with age in trees growing in plantations, we investigated the time course of δ¹³C as recorded in annual tree rings from different genotypes growing at three sites in...

Introduction Because of its vigorous growth, poplar can play an important role for sustainable production of woody biomass to cover renewable energy needs. Hence, the selection of suitable genotypes has to be based on relevant traits, among which intrinsic water use efficiency (W i, estimated through leaf carbon isotope discrimination, Δ) may be a...

The ongoing global change could be an additional threat to the establishment and the long-term survival of Populus nigra L., an emblematic European riparian species. With the general aim of gaining insights into the adaptive potential of this species, we (i) quantified variations within and among three French P. nigra populations for key physiologi...

Mesophyll conductance (gm) is now recognized as an important limiting process for photosynthesis, as it results in a significant decrease of CO2 diffusion from substomatal cavities where water evaporation occurs, to chloroplast stroma. Over the past decade, an increasing number of studies proposed that gm can vary in the short term (e.g. minutes),...

Movement of photoassimilates from leaves to phloem is an important step for the flux of carbon through plants. Fractionation of carbon isotopes during this process may influence their abundance in heterotrophic tissues. We subjected Eucalyptus globulus to 20, 25 and 28 °C ambient growth temperatures and measured compound-specific δ(13)C of carbohyd...

The maintenance in the long run of a positive carbon balance under very low irradiance is a prerequisite for survival of tree seedlings below the canopy or in small gaps in a tropical rainforest. To provide a quantitative basis for this assumption, experiments were carried out to determine whether construction cost (CC) and payback time for leaves...

The objective of this study was to test the effect of water stress and pruning on the resistance of young Scots pines (Pinus sylvestris L.) to a bark beetle associated fungus. Six-year-old potted trees were either pruned (70% of needles removed) or subjected to several successive episodes of severe water stress, prior to inoculation of inner bark w...

The shade impact by Ingo densiflora on water use and drainage in a coffee agroforestry system (AFS) was compared to coffee monoculture (MC) in Costa Rica. Rainfall interception, transpiration, runoff and soil water content were monitored during 3 years. Runoff was lower in AFS than MC (5.4 and 8.4% of total rainfall, respectively) and a higher wate...

Partitioning of gross rainfall into throughfall, stemflow and rainfall interception was assessed in Costa Rica during two rainy seasons (mean annual rainfall of 2900 mm) in two coffee systems: (1) a monoculture (MC) and (2) an agroforestry system (AFS) including Inga densiflora as the associated shade tree species. Coffee architecture, not LAI, app...

“Coffee-Flux” is a sub-project of CAFNET (EuropAid/121998/C/G). It was launched in December 2008 in Costa Rica by Cirad, CATIE, PCP and the Aquiares farm. The aim of Coffee-Flux is to scientifically evaluate environmental services (ES) such as the water balance partitioning (infiltration, aquifer recharge), erosion control and carbon sequestration...

Plasticity of structural and physiological leaf traits elicited by irradiance and soil nutrients was investigated in two sympatric mediterranean oaks: a sclerophyllous (Quercus suber L.) and a non-sclerophyllous species (Q. canariensis Willd.). Seedlings were grown for 2 years in pots in a 2-way crossed factors design. Leaf mass-to-area ratio (LMA)...

Differences in water use efficiency (WUE) have been extensively investigated in trees using carbon-13 in leaf biomass as a surrogate. We now have evidence of considerable diversity for this trait in several tree species, and valuable insight into the genetic control of this diversity is available. Nevertheless, two main questions remain open: 1) Is...

Genetic diversity in intrinsic water use efficiency (Wi) has been studied within a pedunculate oak (Quercus robur L.) family. Wi is defined at the leaf level as the ratio between net CO2 assimilation rate and stomatal conductance to water vapour. For large scale phenotyping, this trait can be estimated by measuring carbon isotope composition (δ13C)...

Figure S1. Data supporting the time stability of growth. (A) Velocity profiles determined by time lapse photography and Kineroot [49]. Time corresponds to the time between beginning of the dark and the sampling time. The mean velocity shown in Figure 1A is the mean ± standard error of mean of these six profiles. (B) Biplot between velocity measured...

Figure S2. Data supporting the time stability of RNA profiles. (A) Profiles of Actin11 transcript density. Blue and red symbols correspond to the data shown in Figure 2A. Data were split into two groups according to their sampling time. The black lines correspond to complementary data - three independent roots collected after more than 72 hours of...

Movie1. Rotating spatio-temporal mapping - Actin11. Visualization of the three dimensional Figure 5A rotating from the temporal axis to the spatial axis.

Movie2. rotating spatio-temporal mapping - EF1β. Visualization of the three dimensional Figure 5B rotating from the temporal axis to the spatial axis.

Movie3. Rotating spatio-temporal mapping - total RNA. Visualization of the three dimensional Figure 5C rotating from the temporal axis to the spatial axis.

Technological advances have enabled the accurate quantification of gene expression, even within single cell types. While transcriptome analyses are routinely performed, most experimental designs only provide snapshots of gene expression. Molecular mechanisms underlying cell fate or positional signalling have been revealed through these discontinuou...

Flooding or waterlogging, and associated soil hypoxia, affect severely the growth and fitness of plant species, from crops to forest ecosystems. An improved understanding of the intra-species genetic diversity of traits involved in hypoxia tolerance is a prerequisite for crop breeding programmes aimed at increasing the tolerance to waterlogging, as...

• In mixed-species forest stands, large losses in tree species diversity often occur during the regeneration phase. In a former coppice-with-standards, we investigated whether the limiting stage in the recruitment process of advance regeneration is the immediate seedling response to canopy release. Experimental canopy gaps were opened and the survi...

Bien représentés en France, les peuplements mélangés sont susceptibles de constituer dans de nombreuses situations un atout intéressant pour la gestion durable des forêts. Cet article « chapeau » rappelle brièvement le contexte particulier des forêts mélangées et présente la philosophie générale d’un projet de recherche mené pendant quatre ans sur...