Résumé
This work presents the new taxon Ficus series Dugandii characterized by the syconium ostiolar margin with wall curved to the outer side of the syconium, forming a short apical tube, irregularly rounded to triangular. For this study, field trips were carried out and collections of herbarium specimens, types, and protologues were analyzed. The series has 15 species with 50 synonyms proposed here, distributed from Mexico and the Antilles to southeastern Brazil. Names like F. llanensis, F. llewelynii, and F. mitrophora, previously synonymous, are considered correct species names. Lectotypes have been designated for F. acarouaniensis, F. clethrifolia, F. glycicarpa, F. holosericea, F. velutina, Urostigma euomphalum, and U. maximilianum; a neotype for F. frigida; and epitypes for F. holosericea and F. trigonata.
Auteurs, date et publication :
Auteurs Leandro C. Pederneiras , Henrique B. Zamengo , Diego Alejandro Zapata-C , Nicole Mitidieri-Rivera , Sergio Romaniuc-Neto , Vidal De F. Mansano
Publication : Systematic Botany
Date : 2023
Volume : 48
Issue : 2
Pages : 263-282
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Abstract
Ganoderma is a genus of wood-decaying polypores fungi with several species, in which morphological delimitation has been challenging due to its large plasticity. Knowledge of the taxonomic diversity of Ganoderma in Cuba remains incomplete. Here, we identified some species, mainly laccate, of Ganoderma present in Cuba based on morphological and phylogenetic data and investigated their relationships with other species. Type specimens, recently collected materials, herbarium specimens and in vitro cultures were studied to delimit morphological species. The phylogenetic affinities of ten species were inferred based on multilocus (ITS rDNA, rpb2, tef1-α) DNA sequences to delimit phylogenetic species. In this work, 14 species of Ganoderma were recognized in Cuba, of which G. amazonense, G. curtisii, G. dussii and G. multiplicatum are reported for the first time. Ganoderma rodriguezii sp. nov. is described as a novel species. We confirmed G. amazonense is a non-laccate species although it is phylogenetically affine to laccate species. An identification key for studied species, nomenclatural information, updated descriptions and geographical distributions are presented. The lectotypification in second step of G. perzonatum, G. pulverulentum and G. zonatum was made here. To correctly interpret G. perzonatum, recent collections, including live strains from the type locality, are described. We confirm G. lucidum is not present in Cuba, despite previous records from the country.
Auteurs, date et publication :
Auteurs Milay Cabarroi-Hernández , Cony Decock , Stéphane Welti , Mario Amalfi , Alma Rosa Villalobos-Arámbula , Daniela Aliaga-Ramos , Guillermo Morera , Emilia Macedo-Pérez Sandi , Abel Almarales Castro , Laura Guzmán-Dávalos
Publication : Biological Journal of the Linnean Society
Date : 2023
Volume : 140
Issue : 3
Pages : 323-357
Catégorie(s)
#CNRS #FORET NouraguesRésumé
Wolbachia
are endosymbiotic alpha-proteobacteria infecting a wide range of arthropods and nematode hosts with diverse interactions, from reproductive parasites to obligate mutualists. Their taxonomy is defined by lineages called supergroups (labelled by letters of the alphabet), while their evolutionary history is complex, with multiple horizontal transfers and secondary losses. One of the least recently derived, supergroup E, infects springtails (Collembola), widely distributed hexapods, with sexual and/or parthenogenetic populations depending on species. To better characterize the diversity of
Wolbachia
infecting springtails, the presence of
Wolbachia
was screened in 58 species. Eleven (20%) species were found to be positive, with three
Wolbachia
genotypes identified for the first time in supergroup A. The novel genotypes infect springtails ecologically and biologically different from those infected by supergroup E. To root the
Wolbachia
phylogeny, rather than distant other Rickettsiales, supergroup L infecting plant-parasitic nematodes was used here. We hypothesize that the ancestor of
Wolbachia
was consumed by soil-dwelling nematodes, and was transferred horizontally via plants into aphids, which then infected edaphic arthropods (e.g. springtails and oribatid mites) before expanding into most clades of terrestrial arthropods and filarial nematodes.
Auteurs, date et publication :
Auteurs Jules Rodrigues , Emilie Lefoulon , Laurent Gavotte , Marco Perillat-Sanguinet , Benjamin Makepeace , Coralie Martin , Cyrille A. D'Haese
Publication : Royal Society Open Science
Date : 2025
Volume : 10
Issue : 5
Pages : 230288
Catégorie(s)
#CNRS #FORET NouraguesRésumé
The triple oxygen isotope composition of phytoliths (17O-excessphyto) can provide key information on past atmospheric relative 15 humidity (RH) over land. Here, we examined how leaf-to-air temperature gradients and changes in the silica polymerization rate in response to stomatal conductance influence the interpretation of 17O-excessphyto in terms of RH. Further, we assessed the reliability of a theoretical isotope model of leaf water evaporation to predict the triple oxygen isotope composition of leaf water on diurnal and seasonal scale. For this purpose, we monitored a grass plot within a natural Mediterranean woodland for one year. We measured in particular the isotope composition of atmospheric water vapor and plot-scale grass leaf temperatures 20 – two variables that are often only estimated. Grass leaf blades were collected in different seasons and over a 24-hour period for leaf water and phytolith isotope analysis. We found that the steady state model reliably predicts the triple oxygen isotope composition of leaf water during daytime but remains sensitive to uncertainties on the leaf-to-air temperature difference. Deviations from isotope steady state at night are well represented by the non-steady state model. In our study, the 17O-excessphyto best reflects average daytime RH over the growth period, rather than daily RH. Average daytime leaf-to-air 25 temperature gradients of less than 2 °C introduce an insignificant bias to the RH estimate. The results also confirm the established triple oxygen isotope fractionation factors between phytoliths and leaf water. The findings of this study help to better understand how to interpret 17O-excessphyto of fossil phytolith assemblages in terms of past RH.
Auteurs, date et publication :
Auteurs Claudia Voigt , Anne Alexandre , Ilja M. Reiter , Jean-Philippe Orts , Christine Vallet-Coulomb , Clément Piel , Jean-Charles Mazur , Julie C. Aleman , Corinne Sonzogni , Helene Miche , Jérôme Ogée
Date : 2022
Catégorie(s)
#CNRS #FORET O3HPRésumé
Descriptive studies of natural history have always been a source of knowledge on which experimental work and scientific progress rely. Poison frogs are a well-studied group of small Neotropical frogs with diverse parental behaviors, distinct calls, and bright colors that warn predators about their toxicity; and a showcase of advances in fundamental biology through natural history observations. The dyeing poison frog, Dendrobates tinctorius, is emblematic of the Guianas region, widespread in the pet trade, and increasingly popular in research. This species shows several unusual behaviors, such as the lack of advertisement calls and the aggregation around tree-fall gaps, which remain poorly described and understood. Here, we summarize our observations from a natural population of D. tinctorius in French Guiana collected over various field trips between 2009 and 2017; our aim is to provide groundwork for future fundamental and applied research spanning parental care, animal dispersal, disease spread, habitat use in relation to color patterns, and intra-specific communication, to name a few. We report sex differences in habitat use and the striking invasion of tree-fall gaps; describe their courtship and aggressive behaviors; document egg development and tadpole transport; and discuss how the knowledge generated by this study could set the grounds for further research on the behavior, ecology, and conservation of this species.
Auteurs, date et publication :
Auteurs Bibiana Rojas , Andrius Pasukonis
Publication : PEERJ
Date : 2019
Volume : 7
Catégorie(s)
#ANR-Citation #CNRS #FORET NouraguesRésumé
Background Rice is the second most produced crop worldwide, but it is highly susceptible to drought-induced yield loss. Micro-organisms can potentially alleviate the negative effects of drought but how they are associated with their host is unclear. The aim of the present study was to unravel the genetic factors involved in this process, and whether it plays a role in rice drought tolerance.
Results To achieve this, we characterized the composition of the root-mycobiota in 296 rice accessions (Oryza sativaL. subsp. indica), grown in the field under control and drought conditions. A Genome Wide Association Study (GWAS) was used to identify marker-trait associations between rice Single Nucleotide Polymorphism (SNP) markers and root mycobiota. This resulted in the identification of ten significant (LOD > 4) SNPs associated with six root associated fungi and four significant SNPs associated with fungi-mediated drought tolerance. The analysis of the genes underlying the loci of the significant markertrait associations identified a priori candidates including genes known to be involved in pathogen defense, abiotic stress responses and cell-wall remodeling processes.
Conclusion Our study shows that the rice genetics affects the recruitment of fungi, some of which affect yield under drought, and provides candidate gene targets for breeding to improve rice-fungal interactions and drought tolerance.
Auteurs, date et publication :
Auteurs Beatriz Andreo-Jimenez , Dennis E. te Beest , Willem Kruijer , Nathan Vannier , Niteen N. Kadam , Giovanni Melandri , S. V. Krishna Jagadish , Gerard Linden , Carolien Ruyter-Spira , Philippe Vandenkoornhuyse , Harro J. Bouwmeester
Date : 2023
Catégorie(s)
#CNRS #EcoGenO #Université de RennesRésumé
Climate change can profoundly alter volatile organic compound (VOC) emissions from vegetation and thus influence climate evolution. Yet, the short- and long-term effects of elevated CO2 concentrations on emissions in interaction with temperature are not well enough understood, especially for VOCs other than isoprene. To gain additional insight, we conducted a study on holm oak, which is known for its strong foliar monoterpene emissions that are directly linked to their synthesis. We measured CO2-response curves of emissions, CO2–H2O gas exchanges and chlorophyll fluorescence at two assay temperatures (30 and 35 ∘C) on saplings of four populations grown under normal and double CO2 concentrations combined with two temperature growth regimes differing by 5 ∘C (day/night: 25/15 and 30/20 ∘C). A stepwise reduction in CO2 resulted in a decrease in emissions, occasionally preceded by an increase, with the overall decrease in emissions being greater at 35 ∘C than at 30 ∘C assay temperature. During ramping to high CO2, emissions remained mostly unchanged at 35 ∘C, whereas at 30 ∘C they often dropped, especially at the highest CO2 levels (≥ 1200 ppm). In addition to the actual leaf temperature, the high CO2 responsiveness of emissions was modulated by the plant's growth temperature with warm-grown plants being more sensitive than cool-grown plants. In contrast, growth CO2 had no significant effect on the CO2 sensitivity of emissions, although it promoted plant growth and the leaf emission factor. Correlation analyses suggest that the emission response to CO2 depended primarily on the availability of energetic cofactors produced by photosynthetic electron transport. This availability was likely limited by different processes that occurred during CO2 ramping including photooxidative stress and induction of protective and repair mechanisms as well as competition with CO2 fixation and photorespiration. In addition, feedback inhibition of photosynthesis may have played a role, especially in leaves whose emissions were inhibited only at very high CO2 levels. Overall, our results confirm an isoprene-analogous behavior of monoterpene emissions from holm oak. Emissions exhibit a non-linear response curve to CO2 similar to that currently used for isoprene emission in the MEGAN model, with no difference between major individual monoterpene species and plant chemotype. Simulations estimating the annual VOC releases from holm oak leaves at double atmospheric CO2 indicate that the observed high-CO2 inhibition is unlikely to offset the increase in emissions due to the predicted warming.
Auteurs, date et publication :
Auteurs Michael Staudt , Juliane Daussy , Joseph Ingabire , Nafissa Dehimeche
Publication : Biogeosciences
Date : 2022
Volume : 19
Issue : 20
Pages : 4945-4963
Catégorie(s)
#CNRS #FORET PuechabonRésumé
Lack of tree fecundity data across climatic gradients precludes the analysis of how seed supply contributes to global variation in forest regeneration and biotic interactions responsible for biodiversity. A global synthesis of raw seedproduction data shows a 250-fold increase in seed abundance from cold-dry to warm-wet climates, driven primarily by a 100-fold increase in seed production for a given tree size. The modest (threefold) increase in forest productivity across the same climate gradient cannot explain the magnitudes of these trends. The increase in seeds per tree can arise from adaptive evolution driven by intense species interactions or from the direct effects of a warm, moist climate on tree fecundity. Either way, the massive differences in seed supply ramify through food webs potentially explaining a disproportionate role for species interactions in the wet tropics.
Auteurs, date et publication :
Auteurs Valentin Journé , Robert Andrus , Marie-Claire Aravena , Davide Ascoli , Roberta Berretti , Daniel Berveiller , Michal Bogdziewicz , Thomas Boivin , Raul Bonal , Thomas Caignard , Rafael Calama , Jesús Julio Camarero , Chia-Hao Chang-Yang , Benoit Courbaud , Francois Courbet , Thomas Curt , Adrian J. Das , Evangelia Daskalakou , Hendrik Davi , Nicolas Delpierre
Publication : Ecology Letters
Date : 2025
Volume : 25
Issue : 6
Pages : 1471-1482
Catégorie(s)
#CNRS #FORET PuechabonRésumé
An accurate assessment of terrestrial ecosystem transpiration (T) is important to understand the vegetation-atmosphere feedbacks under climate change. Solar-induced chlorophyll fluorescence (SIF) shows great potential to estimate T because of its mechanical linkage with photosynthesis and stomatal conductance. However, a global and spatially estimation of terrestrial T based on remotely sensed SIF remains unresolved and novel strategies are challenged to entail a precise partition of T from evapotranspiration (ET) across various biomes. Here, with far-red SIF from Sentinel-5 Precursor satellite and ground observations for a total of 30 sites encompassing ten primary plant functional types (PFTs), we extend a SIF-driven semi-mechanism canopy conductance (gc) model for different plant functional types (PFTs), and use the optimized Penman-Monteith model (PMopt) to calculate T and T/ET. We reveal that the relationship between SIF and the product of gc and 0.5 power of vapor pressure deficit (gc × VPD0.5) is tighter than the relationship between SIF and ecosystem productivity. The SIF-gc × VPD0.5 linear regressions show improved R2 and increased magnitude in slopes across PFTs when aggregating daily to 16-day. Our T/ET results show high correlations with the results of the Ball-Berry-Leuning model combined with PMopt at the site scale (R2 = 0.69), and with the results calculated by leaf area index in a previous study at the PFT scale (0.70). We further determine the global mean T/ET (0.57 ± 0.14), close to the ensemble mean of global averaged T/ET (0.55), using 36 different methods. The global T estimated using the SIF-based approach is compared with two other remote sensing products. Our method provides a valuable tool for T and ET estimation using remote sensing data and is critical to understanding ecohydrological processes under climate change.
Auteurs, date et publication :
Auteurs Yaojie Liu , Yongguang Zhang , Nan Shan , Zhaoying Zhang , Zhongwang Wei
Publication : Journal of Hydrology
Date : 2022
Volume : 612
Pages : 128044
Catégorie(s)
#CNRS #FORET PuechabonAuteurs, date et publication :
Auteurs Mailyn Adriana Gonzalez , Christopher Baraloto , Julien Engel , Scott A Mori , Pascal Pétronelli , Bernard Riéra , Aurélien Roger , Christophe Thébaud , Jérôme Chave
Publication : Plos One
Date : 2025
Volume : 4
Issue : 10
Pages : e7483