Academic literature on the topic 'Reproduction végétale'
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Journal articles on the topic "Reproduction végétale"
Sánchez-Losada, Margarita, Angel Eduardo Reyes Vázquez, Freddy Rodríguez Santana, Nicasio Viña Dávila, and Germán López Iborra. "Biología reproductiva de <em>Polioptila lembeyei</em> (Aves: Polioptilidae) en la Reserva Ecológica Siboney-Juticí, Santiago de Cuba, Cuba." Journal of Caribbean Ornithology 28 (September 24, 2015): 6–10. http://dx.doi.org/10.55431/jco.2015.28.6-10.
Full textMarage, Damien, Jean-Claude Rameau, and Luc Garraud. "Banque de graines du sol et succession végétale dans les Alpes du Sud : effets des facteurs historiques et écologiques." Canadian Journal of Botany 84, no. 1 (January 2006): 99–111. http://dx.doi.org/10.1139/b05-142.
Full textLOTCHIO, Alain, Aliou DICKO, and Armand Kuyéma NATTA. "Impact de la provenance, de la morphologie et du stockage des graines de Lophira lanceolata sur leur germination au Bénin." BOIS & FORETS DES TROPIQUES 353 (October 1, 2022): 3–16. http://dx.doi.org/10.19182/bft2022.353.a36994.
Full textMiller, J. Robert, Jean Miller, and Scott L. Findholt. "Distribution, population status, nesting phenology, and habitat of the West Indian Woodpecker (<em>Melanerpes superciliaris nyeanus</em>) on San Salvador Island, Bahamas." Journal of Caribbean Ornithology 31 (December 24, 2018): 26–33. http://dx.doi.org/10.55431/jco.2018.31.26-33.
Full textCamus, Audrey. "« Prak engendra Flop » : Graal Flibuste ou la répétition subvertie." Études littéraires 38, no. 2-3 (September 5, 2007): 159–71. http://dx.doi.org/10.7202/016351ar.
Full textDemorgon, Jacques. "The Redoubled In-Between between the Cosmos and the Human or the Hidden Interity." L’Entre-deux et l’Imaginaire, no. 37 (June 30, 2016): 83–95. http://dx.doi.org/10.35562/iris.1405.
Full textDemorgon, Jacques. "The Redoubled In-Between between the Cosmos and the Human or the Hidden Interity." L’Entre-deux et l’Imaginaire, no. 37 (June 30, 2016): 83–95. http://dx.doi.org/10.35562/iris.1405.
Full textColignon, Pierre, Éric Haubruge, Charles Gaspar, and Frédéric Francis. "Effets de la réduction de doses de formulations d’insecticides et de fongicides sur l’insecte auxiliaire non ciblé Episyrphus balteatus [Diptera : Syrphidae]." Phytoprotection 84, no. 3 (June 15, 2004): 141–48. http://dx.doi.org/10.7202/008491ar.
Full textDigard, J. P., Etienne Landais, and Philippe Lhoste. "La crise des sociétés pastorales. Un regard pluridisciplinaire." Revue d’élevage et de médecine vétérinaire des pays tropicaux 46, no. 4 (April 1, 1993): 683–92. http://dx.doi.org/10.19182/remvt.9426.
Full textTassin, Jacques, Ronald Bellefontaine, Edmond Roger, and Christian A. Kull. "Evaluation préliminaire des risques d'invasion par les essences forestières introduites à Madagascar." BOIS & FORETS DES TROPIQUES 299, no. 299 (March 1, 2009): 27. http://dx.doi.org/10.19182/bft2009.299.a20420.
Full textDissertations / Theses on the topic "Reproduction végétale"
Boyer, Catherine. "Conceptualisation de la reproduction végétale à l'école primaire." Paris 5, 1998. http://www.theses.fr/1998PA05H001.
Full textThis research studies and inquires into the conditions under which the assimilation and construction of scientific knowledge operate for primary school children. For several classes, from first-years infants to second-year primary this developmental study analyses the gradual shift from the everyday situations. It underlines that the inescapable precursor elements of conceptualization-children's initial representations are found to be very distant from scientific concepts and are fraught with very stubborn obstacles. Believed not to be interrelated, these conceptions are mainly expressed at everyday level. Consequently, a break brought about by specific didactic situations is indispensable if a more scientific conception is to be obtained. Questioning, observation and experimentation thus contribute towards this break. In this process the socio-cognitive conflict proves to be crucial and promotes the predominance of scientific operative invariants. The variety of signifiants also plays an important part. As regards accession to a scientific conception, this will come from a development of relationships between the different concepts. However, although the everyday concept is found to be an obstacle, vocabulary also proves to be a source of problems for the young pupil. For any one child one and the same word will awaken different conceptions over time, just as one and the same formulation level out of context will correspond in children's minds to an everyday or scientific conception. It is in fact only by dealing with individual cases, in conjuction with reciprocal relationship, that children's conceptualization can perhaps be understood. The concepts of seed, flower and fruit thus occur in a partial relative order and, if towards the age of 9 conceptualization of vegetable reproduction becomes scientifc, this does not mean that it is yet finalized or stabilized
Villar, Marc. "Incompatibilité interspécifique chez Populus : approches physiologique et biochimique." Lyon 1, 1987. http://www.theses.fr/1987LYO10008.
Full textGaget, Mireille. "Incompatibilité interspécifique chez Populus : effet Mentor." Lyon 1, 1988. http://www.theses.fr/1988LYO10012.
Full textDehlouz, Kilian. "Quels sont les acteurs moléculaires influençant le devenir et la différenciation du bourgeon axillaire de fraisier en stolon ou en branche pouvant se terminer par une inflorescence ?" Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0310.
Full textStrawberries reproduce both sexually (flowering) and asexually (stolons). These two methods, although antagonistic, are agronomically important: flowering influences fruit yield, while stolons enable the propagation of varieties. This competition takes place in particular at the level of axillary buds (AxB), which develop either into branches that can end in an inflorescence, or into stolons. Understanding the genetic network controlling AxB development is crucial, as it affects both fruit and plant yield in strawberry.The aim of my thesis is to elucidate the molecular mechanisms involved in the balance between sexual and asexual reproduction in diploid strawberry through three main questions:1. What are the molecular actors involved in the development of axillary buds into stolons or branches? A comparative transcriptomics approach on morphologically undifferentiated AxB has enabled us to identify biological processes and a shortlist of genes potentially involved in this balance.2. What are the molecular actors involved in the differentiation of AxB into stolons or branches, and can we associate a molecular signature of AxB according to differentiation stage and fate? Comparative and predictive transcriptomic analyses of AxB taken from different genotypes, at different stages of development and in different positions on the plant, have revealed key players and signature genes for AxB fate and differentiation status.3. Do changes in the expression of candidate genes alter the balance between sexual and asexual reproduction? Genome-editing approaches via CRISPR were used on two genes of interest to assess the impact of loss-of-function of these genes on the balance between sexual and asexual reproduction.This thesis enabled us to complete the regulatory network that controls AxB fate and differentiation, and thus the balance between sexual and asexual reproduction in strawberry, and to highlight potential targets for the improvement of cultivated strawberry
Jnoud, Najat. "Incompatibilité interspécifique chez Populus : approches cytologique et cytochimique." Lyon 1, 1991. http://www.theses.fr/1991LYO10056.
Full textDornier, Antoine. "Dynamique et évolution des métapopulations chez les plantes : l'exemple de Crepis sancta (Asteraceae) en milieu urbain." Montpellier 2, 2008. http://www.theses.fr/2008MON20104.
Full textLandscape heterogeneity induces spatial structure of populations at a given spatiotemporal scale. These populations experiment frequent extinctions that are counterbalanced by colonization events. Metapopulation dynamics determines species viability and population spatial structure. Furthermore, selection pressures in a metapopulation context differ from those in large panmictic populations, in particular due to the transient nature of populations. Small transient populations of Crepis sancta (Asteraceae) around ornamental trees in urban environment have been studied in order to analyze species metapopulation dynamics. From 4 consecutive years occupancy data, a spatially realistic model has been parameterized. Also, genetics markers allowed us to describe dispersal processes (seed and pollen). Factors affecting extinction namely population size, inbreeding and connectivity have been studied. Finally, consequences of heterogeneous densities on mating system have been studied both both theoretically and experimentally. We show that metapopulation framework allows us to describe two general patch dynamic scenarios : a patch dynamic where local dispersal does matter in one site and a second scenario where external colonization account for metapopulation dynamics. Unexpectedly numerous seeds have been found to not come from local reproduction and we hypothesize the existence of a seed bank whose effects remain to be studied. Demographic factors explain extinction and dispersal reduces extinction risk. Finally, we demonstrated the existence of an Allee effect, which underlines the importance of the demographical context on fitness, and we analyzed theoretically its effect on the selection of self-fertilization in a metapopulation
Bittebiere, Anne-Kristel. "La clonalité : un processus majeur de la dynamique spatiale et du fonctionnement des communautés végétales en systèmes prairiaux." Rennes 1, 2012. https://tel.archives-ouvertes.fr/tel-00725017.
Full textDispersion through clonal growth may be a major process of plant community structuring especially in prairial systems where most species are clonal. These species produce genetically identical ramets organized in a network structure, whose aggregation depends on the species clonal growth strategy. The present thesis aims at analyzing and understanding grassland plant community dynamics based on spatial assembly rules of clonal species and determining its consequences on the community functioning. To achieve these goals, we used complementary experimental and modeling approaches. We demonstrated that clonal growth strategies determine community spatial structure at fine scale, generating a wide range of patterns. The species spatial pattern varied depending on the clonal growth strategies occurring in the community. This variability was suggested to result from a modification of clonal traits in response to the biotic environment. Indeed, we highlighted that the clone is able to adjust its horizontal growth according to its competitor's identity thanks to information collected by ramets. The adaptive nature of this plastic response in competition resistance was dependent on plant structural blue-print and to a lower extent on ontogeny. We also demonstrated that clonal traits had a major role in community functioning by influencing productivity, probably through the spatial patterns they drive. These results have been applied to the setting-up of herbaceous buffer strips and helped to define an optimal sowing with regard to their function of water preservation. The present thesis underlines the importance of processes operating at the clone scale for those operating at the community or the ecosystem scale
Leducq, Jean-Baptiste. "Système de reproduction, dispersion et succès reproducteurs chez une espèce végétale menacée : exemple de Biscutella neustriaca (Brassicaceae), une espèce auto-incompatible et micro-endémique." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10015/document.
Full textIn sexual species, reproduction systems and dispersal could involve in viability of small populations by having directly an impact on individuals’ reproductive success. In plants, reproduction and dispersal are mainly passive processes and thus depend of local density in mates, isolation between populations and genetic relationships among individuals. In Biscutella neustriaca, a micro-endemic plant of the Seine river valley, we highlight a strong genetic isolation between populations corroborated by habitat fragmentation and low dispersal abilities of the species. By using phenotypic and molecular approaches, we determine that B. neustriaca is strictly self-incompatible. In this context of isolation and spatially structured genetic diversity, we wonder to what extent dispersal and self-incompatibility impact individuals’ reproductive successes. Through an ex situ experiment, we highlight both effects of pollen limitation and decrease in local density of compatible mates on maternal reproductive success decrease. In four natural populations, we identify individual reproductive potential and local density of available mates as main factors explaining male and female reproductive successes variability. Genetic factors as inbreeding depression and self-incompatibility also seem to evolve in reproductive successes in some populations. We discuss about importance of considering many factors when acting for conservation in a threatened population, the need to know the reproductive system and dispersal abilities of the species, inseparable from a monitoring of targeted populations, where effects of these factors are only detectable at certain temporal and spatial scales. We illustrate our works by a concrete conservation action in one of the studied populations
Lesaffre, Thomas. "Contribution à une théorie physiologique et génétique de l’évolution végétale : fardeau génétique, systèmes de reproduction et évolution du taux de mutation dans les populations structurées en classes." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR014.
Full textIn Angiosperms, there exists a strong association between life-history and mating system. Indeed, most predominantly selfing species are annual while the majority of perennials are outcrossers. This association is the starting point of the work presented in this thesis. In the first chapter, I study the joint evolution of lifespan and selfing assuming that inbreeding depression affects survival between flowering seasons and is fixed by a parameter. Under these assumptions, lifetime inbreeding depression increases as lifespan increases therefore preventing the evolution of self-fertilisation in a wider parameter range. When it occurs, it induces the evolution of shorter lifespans. These results are in agreement with the empirically observed pattern. In chapter two, I relax the assumption that inbreeding depression is fixed by a parameter, by assuming an explicit genetic basis. Far from generating higher inbreeding depression in more long-lived species, deleterious mutations affecting survival result in a decrease of inbreeding depression with longevity at mutation-selection equilibrium. Yet, increased inbreeding depression is empirically observed in long-lived species. In the following chapters, I explore two hypotheses to explain this increase. In chapter two, I study the more general idea that variations in the fitness effects of mutations with longevity, of which mutations affecting survival are a mere special case, may generate increased inbreeding depression in longer-lived species. In chapter three, I model the consequences of inheritable somatic mutations accumulating during growth for the evolution of the mutation rate and the resulting inbreeding depression in plants. As for chapter four, it is devoted to a theoretical evaluation of indirect inbreeding depression estimation methods. I end this manuscrit by proposing leads and ideas for the development of a physiological and genetic theory of plant evolution
Journé, Valentin. "Influence du climat lors de l'investissement des ressources dans la reproduction chez les arbres forestiers : une approche par modélisation mécaniste." Thesis, Aix-Marseille, 2020. http://theses.univ-amu.fr.lama.univ-amu.fr/200217_JOURNE_229kn950dq423kitgvy940umn_TH.pdf.
Full textGlobal changes affect species distribution and ecosystems functioning due to long term climatic trends and extreme climatic events. Forests are notably subject to massive growth decline and even mortality. One of the major processes of forest dynamics is sexual reproduction, but there are still many uncertainties about the effect of climate on trees reproduction, especially on when and how resources are allocated to pollen and seeds. Reproduction also allows species to persist over generations, through adaptation and migration. The main objective of this thesis is to develop an approach based on resource and phenology modelling, in order to understand and predict climate effects on forest trees reproduction. First, I used statistical model to investigate temporal and spatial variation of fruit production. Second, I quantified the allocation of resources between vegetative versus reproductive functions, with a hierarchical Bayesian model and observation of growth, male and female reproduction over several years. Results allowed us to identify trade-off during floral initiation, and highlighted the importance of resources levels to ensure reproduction. Lastly, I developped a process-based model of reproduction and included it in an existing model of forest functioning (CASTANEA). The reproduction model, which runs from flower initiation to seed maturation, simulates spatial and temporal patterns of seed production. The model was calibrated and validated on silver fir on Mont-Ventoux and used to investigate how climate change will impact fruit production
Books on the topic "Reproduction végétale"
Conceptualisation de la reproduction végétale à l'école primaire. Lille: A.N.R.T., Université de Lille III, 2000.
Find full textFaire des sciences à l'école: Cahier n°1. Les végétaux, la reproduction, l'environnement. Canopé - CRDP de Nantes, 2000.
Find full textHincha, Dirk K., and Ellen Zuther. Plant Cold Acclimation: Methods and Protocols. Springer, 2020.
Find full textHincha, Dirk K., and Ellen Zuther. Plant Cold Acclimation: Methods and Protocols. Springer, 2021.
Find full textBook chapters on the topic "Reproduction végétale"
Dheur, Sonia, and Sven J. Saupe. "La place du végétal dans une pensée du vivant." In L’humain et le végétal. Processus et formes de vie partagés, 27–47. Besançon: Presses universitaires de Franche-Comté, 2024. https://doi.org/10.4000/12w2q.
Full textScaramuzzi, Igor. "Chapitre 15. Modes de vie, création et reproduction des forêts de castanheiras (Haut Trombetas)." In Voix végétales, 253–66. IRD Éditions, 2023. http://dx.doi.org/10.4000/books.irdeditions.49698.
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