Literatura científica selecionada sobre o tema "Fusarium – Lutte biologique contre"
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Artigos de revistas sobre o assunto "Fusarium – Lutte biologique contre"
Frédéric, Kouame Kra, Agre Don Josette, Komoe Koffi, Baka Yapi Richmond e Kouadio Edouard Yves Gilchrist. "Effet in Vitro des Extraits d’Algues [Sargassum natans (Børgesen) Børgesen et Sargassum fluitans (Børgesen) Børgesen, Sargassaceae] sur Fusarium sp., Agent Causal de la Fusariose Vasculaire de la Tomate (Solanum lycopersicum L., Solanaceae)". European Scientific Journal, ESJ 19, n.º 9 (31 de março de 2023): 47. http://dx.doi.org/10.19044/esj.2023.v19n9p47.
Texto completo da fonteNyaka, Aurélie Irène Claire Ngobisa, Sine Nsangou Mfiya Zahrah Fadimatou, Camille Ulrich Dzoyem Dzokouo, Sali Bourou e Aoudou Yaouba. "Effet antifongique de deux extraits de plantes sur les agents pathogènes identifiés sur des fruits de l’anacardier (Anacardium occidentale L.) au Nord Cameroun". International Journal of Biological and Chemical Sciences 15, n.º 3 (9 de setembro de 2021): 1121–39. http://dx.doi.org/10.4314/ijbcs.v15i3.21.
Texto completo da fonteBourée, P. "Lutte biologique contre la leishmaniose cutanée". Médecine et Santé Tropicales 24, n.º 1 (janeiro de 2014): 26. http://dx.doi.org/10.1684/mst.2014.0301.
Texto completo da fonteRoy, M. "État actuel de la lutte biologique contre les acariens phytophages par des acariens prédateurs". Phytoprotection 74, n.º 1 (12 de abril de 2005): 41–49. http://dx.doi.org/10.7202/706035ar.
Texto completo da fonteBoisclair, Josée, e Bernard Estevez. "Lutter contre les insectes nuisibles en agriculture biologique : intervenir en harmonie face à la complexité". Phytoprotection 87, n.º 2 (10 de novembro de 2006): 83–90. http://dx.doi.org/10.7202/013977ar.
Texto completo da fonteBoussim, Joseph I., e Nayéré Médah. "Méthodes de lutte contre les Loranthaceae". Flora et Vegetatio Sudano-Sambesica 12 (1 de janeiro de 2009): 27–35. http://dx.doi.org/10.21248/fvss.12.9.
Texto completo da fonteKenis, Marc, Brett P. Hurley, Ann E. Hajek e Matthew J. W. Cock. "Stratégies de lutte biologique contre les insectes invasifs (Résumé)". Revue Forestière Française, n.º 6 (2018): 605. http://dx.doi.org/10.4267/2042/70309.
Texto completo da fonteUilenberg, Gerrit. "Lutte intégrée contre les parasitoses animales tropicales". Revue d’élevage et de médecine vétérinaire des pays tropicaux 49, n.º 2 (1 de fevereiro de 1996): 124–29. http://dx.doi.org/10.19182/remvt.9529.
Texto completo da fonteBawin, T., F. Seye, S. Boukraa, J. Y. Zimmer, F. Delvigne e F. Francis. "La lutte contre les moustiques (Diptera: Culicidae): diversité des approches et application du contrôle biologique". Canadian Entomologist 147, n.º 4 (29 de outubro de 2014): 476–500. http://dx.doi.org/10.4039/tce.2014.56.
Texto completo da fonteLadoh Yemeda, CF, R. Mony, M. Tchatat e S. Dibong. "Contribution des fourmis à la lutte biologique contre les Loranthaceae". International Journal of Biological and Chemical Sciences 7, n.º 3 (4 de junho de 2014): 924. http://dx.doi.org/10.4314/ijbcs.v7i3.4.
Texto completo da fonteTeses / dissertações sobre o assunto "Fusarium – Lutte biologique contre"
Besset-Manzoni, Yoann. "Améliorer les principes de sélection de nouveaux agents bactériens de biocontrôle contre la fusariose du blé". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1124/document.
Texto completo da fonteTo combat pests of crops (herbivores and pathogens) new pathways have been explored, in particular biological control. Used the nature and its organisms to regulate the populations of pathogens, that is the goal of the biological fight also called biocontrol. Among the organisms commonly found in biocontrol are micro-organisms, be they fungi or bacteria. These microorganisms have very interesting capabilities for farmers and agronomists. Indeed, studies have shown that they are able to interact with plants to allow a better growth and health of it.Then, in this thesis, we were interested in bacteria to find alternative methods of struggle with Fusarium graminearum, a pathogen of cereals responsible for high yield losses, especially thanks to the production of mycotoxins that will make the seeds unfit for human and animal consumption.Through an original approach of keeping noninhibitory strains in vitro for in planta tests, we have been able to show the limitations of in vitro selection. Thanks to the metabolic exploration of a particularly efficient strain, we have also been able to highlight potential new antifungal molecules. Through a model strain, we explored the mechanisms of the establishment of systemic resistance in wheat induced by bacteria. And finally, we have explored the potential of bacterial combinations in wheat protection that seems to represent a real future in the world of biocontrol.The work done is in line with the needs of new resources to limit the use of pesticides, but also in a need to better understand the tripartite interactions between wheat, pathogen and beneficial bacteria
La, Broise Denis de. "Croissance et sporulation de Fusarium oxysporum en milieux liquides et solides : étude des facteurs limitants et application à la production industrielle de spores pour la protection des cultures". Compiègne, 1988. http://www.theses.fr/1988COMPD131.
Texto completo da fonteHabrylo, Olivier. "Une E. S. T. (Expressed Sequence Tag) conduit à la caractérisation, chez le houblon (Humulus lupulus), de trois inhibiteurs de xyloglucanase dont l’expression est influencée par des facteurs biotiques et abiotiques". Strasbourg, 2011. http://www.theses.fr/2011STRA6143.
Texto completo da fontePhytopathogenic fungi secrete a powerful arsenal of enzymes potentially active on each polysaccharide layer of the plant cell. As a first line of defense, plant cell walls contain several inhibitors to specifically inhibit the activity of these microbial enzymes. In the present study we describe the identification and characterization of three xyloglucan-specific endoglucanase inhibitor proteins (XEGIPs) from hop (Humulus lupulus). Some evidences have been accumulated about the role of these XEGIPs in plant defense. Starting from an expressed sequence tag three genes were isolated by the rapid amplification of cDNA ends, cloned and corresponding proteins expressed in insect cells. The functions of the proteins were validated by enzymatic activity measurements were performed with xyloglucan as substrate. Inhibitor n°1 and inhibitor n°2 were shown to inhibit the hydrolytic activity of xyloglucan-specific endoglucanase from the fungi Aspergillus aculeatus and Fusarium graminearum. The investigation on target enzymes lead to production, expression and characterization of four unknown GH12 from F. Graminearum. Real-time PCR have shown variations in the spatial distribution of inhibitors and differential expression between hop cultivars. The main lines are the following : inhibitor n°1 is expressed as a result of wounding and inhibitor n°2 is inducible by F. Graminearum. Inhibitor n°3 could be have a physiological function with a positive regulation during the germination stages and in the female hop cones
Pellan, Lucile. "Décryptage des mécanismes impliqués dans le biocontrôle des champignons mycotoxinogènes des céréales". Thesis, Montpellier, 2020. http://www.theses.fr/2020MONTG036.
Texto completo da fonteDeciphering the mechanisms involved in the biocontrol of mycotoxinogenic fungi of cereals.Cereals are the first factor of consumer exposure to mycotoxins, toxic secondary metabolites synthesized by particular moulds and which present a risk for human and animal health. The species Fusarium graminearum and Fusarium verticillioides are thus responsible for the production of trichothecenes and fumonisin-like mycotoxins, respectively, with a high impact especially in pre-harvest. With the decrease of pesticide use due to their toxicity, an alternative strategy to control these fungal diseases in the field may be the use of antagonistic microorganisms. Non-pathogenic, these biocontrol agents (BCAs) are able to limit the progression of Fusaria and their synthesis of mycotoxins through various biological mechanisms, however still poorly understood. In this context, the objectives of this study are to evaluate by which mechanisms three selected BCAs (Streptomyces griseoviridis, Trichoderma asperellum, Pythium oligandrum) can modulate the growth and mycotoxin production of Fusarium pathogens, in vitro and in situ. Antagonistic activities and varying levels of inhibition of growth (up to 80%) and mycotoxinogenesis (up to 90%) have been observed in vitro depending on BCAs, pathogens or culture conditions. The hypotheses are then verified and completed thanks to the development of a toolbox of tests specific to certain modes of action. Their chronology is evaluated throughout the interaction, from pathogenic spore germination to the formation of perithecia, by testing a wide variety of BCA mechanisms: synthesis of anti-germinative compounds, mycophagy, chitinolytic enzyme synthesis, emission of volatile antifungal compounds, inhibition of mycotoxin biosynthesis pathways, mycotoxin bio-transformation, spatial and nutritional competition or impact on pathogen conservation. S. griseoviridis presents nutritional competition capacities, but its main strategy is based on antibiosis, through the synthesis of numerous antifungal compounds that offsets a significant deficit in spatial colonization capacity. However, it can stimulate the mycotoxin production. T. asperellum is capable of activating a very wide range of defenses and attacks combining the synthesis of various antifungal compounds (metabolite, enzymes, VOCs), with different targets (spores, mycelium, mycotoxins), and a direct action by mycoparasitism. The efficacy of P. oligandrum is mainly due to its strong capacity to colonize the environment, with a direct action via microbial predation and reduction of perithecia formation. These in vitro performances could also be analyzed in F. graminearum in situ throughout its life cycle (from colonization of ears to survival in culture residues), and put into perspective with the different modes of action identified in each of the BCAs. The whole project has led to important advances in deciphering the mechanisms of action of BCAs and proposes ways of improvement to optimize the use and efficacy of these antagonists. Thus limit the use of chemical plant protection products, while maintaining a healthy production with low levels of mycotoxins
Legrand, Fabienne. "Gestion des communautés microbiennes telluriques pour réduire l'incidence des Fusarium toxinogènes sur céréales à pailles et développer une stratégie de lutte biologique". Thesis, Brest, 2017. http://www.theses.fr/2017BRES0080.
Texto completo da fonteFusarium Head Blight (FHB) is a devastating disease for cereals, and for wheat in particular, threatening both crop yields and quality, given the ability of Fusarium spp. to produce mycotoxins. Among the Fusarium species complex, Fusarium graminearum is the most common causal agent of the disease. The incidence of FHB in Brittany (France) can be particularly high. Indeed, the agronomic practices include cereal rotations with frequent wheat and maize crops which increase the risk of FHB. Moreover, the climate favors the pathogen development.Currently, appropriate management of the residues, on which F. graminearum grows saprophytically, and the use of fungicide treatments at flowering constitute the two main ways to manage FHB. However, these strategies do not always guaranty an appropriate crop protection. The low and variable efficacy of these methods, combined to the socio-economic pressures, urge to find effective and sustainable alternatives. In this context, the first objective of this work was to develop, evaluate and optimize a biocontrol strategy aiming to reduce F. graminearum primary inoculum in soils, and thus reduce FHB risk for the crops, using both laboratory and field experiments. Although the biocontrol product was able to limit the pathogen growth in autcolaved soils, its efficacy was reduced when taking the interactions with the soil microbiota into account. The diversity and the structure of soil microbial communities were then studied for 31 agricultural fields using a metabarcoding approach in order to highlight the influence of climatic conditions, agronomic practices and soil physicochemical factors. Metabarcoding analysis revealed the importance of diversity and abundance of the soil microbial communities to reduce F. graminearum primary inoculum. This microbiota was also found to be influenced by agronomic practices and physico-chemical factors. Finally, the abundance of specific bacterial genera was related to the reduction of F. graminearum primary inoculum. Outcomes of this work highlight the importance of the soil biological activity and suggest that a manipulation of the soil microbial communities might lead to a better FHB management
Neched, Hassiba. "Étude comparative des traitements de semences sans fongicide chez les céréales à l'aide de l'ozone et de l'oxygène pur". Master's thesis, Université Laval, 2015. http://hdl.handle.net/20.500.11794/25888.
Texto completo da fonteSeedling blight and root rot are part of cereal diseases of field crops in Quebec. They are caused by two pathogens, Fusarium graminearum and Bipolaris sorokiniana, which contaminate the seed grain, especially wheat and barley, which causes both decreased, lift and lower performance. Organic farmers are trying to find a seed without fungicide treatment to fight against these fungi, which are harmful to cereal farming. Our project has as goal to use the oxidative action of oxygen or ozone moistened to cause oxidative stress in order to reduce the impact of the two pathogens responsible for this disease, F. graminearum and B. sorokiniana, while preserving the germinability of the seeds. The dose in oxidizing agent, the flow of oxidizing gases (ozone and/or oxygen) and the time of exposure are key parameters to optimize for this oxidative treatment and germination kinetics treated cereal seed. Such treatment looked promising for the seed of wheat. It was however a little less for the seed of barley because it’s fairly rigid envelope which made difficult the penetration of ozone and oxygen. To remedy this problem, we have preliminary tests on barley using sonication ultrasonic as pre-treatment of barley oxidative pre-treatment. The results suggest that, such treatment is promising and significant in order to optimize our oxidative treatment and subsequently, reduce the causative agents of disease without harming the quality of cereal seed. This point has been addressed in our work by a preliminary test on barley, and this approach looks very promising for our future research.
Lecomte, Charline. "Fusariose du cyclamen : détection préventive du risque et contrôle biologique". Thesis, Dijon, 2016. http://www.theses.fr/2016DIJOS002/document.
Texto completo da fonteFusarium wilt of cyclamen is one of the most damaging diseases of cyclamen. The causal agent, Fusarium oxysporum f. sp. cyclaminis, is a soil-borne fungus. Losses can reach more than 50 % of the production. Several methods of control are available, but none of them offer an efficient and environmentally friendly solution. In this context, a project was developed in collaboration with the French institute of horticulture, Astredhor, which represents the producers, the INRA of Dijon, for its expertise on F. oxysporum and the company Agrene for its expertise in biological control. The project has two goals: i) design a molecular marker specific of Fusarium oxysporum f. sp. cyclaminis allowing a better management of the disease, ii) identify one or several efficient biological control agents.A collection of strains representative of the diversity of F. oxysporum f. sp. cyclaminis populations was made up with strains from international collections and isolates collected from symptomatic and asymptomatic cyclamens. A molecular study of the collection demonstrated the high genetic diversity of the forma specialis, which makes the identification of a specific molecular marker more complicated. However, a specific DNA fragment was identified by random amplified polymorphic DNA. A primer pairs was designed and a specific tool of detection was developed. Thanks to this tool, it is now possible to detect the fungus in planta by conventional and real-time PCR.Simultaneously, a broad literature analysis on the biocontrol of ornamental plant diseases caused by F. oxysporum was performed. The review emphasized that biocontrol of F. oxysporum encompassed both microbial biocontrol agents and botanicals. To avoid the laborious and time-consuming screening step, we decided to assess the antagonistic activity of seven commercial products containing bacteria, fungi or a combination of both microorganisms. Greenhouse trials were performed under conditions similar to those of the production. First trial led to the exclusion of the less efficient products. Other trials were conducted with the three remaining products. Disease reduction was obtained with one of these products although it must be validated in production.Finally, the molecular tool of detection will allow producers to insure the health status of the culture. In addition, the efficient biocontrol agent identified will prevent the disease progress for a while but more investigations are needed to obtain reliable, efficient and sustainable biocontrol agents. Proposals to improve Fusarium wilt control are discussed
Mephane, Eléonore. "Conception de cocktails issus de co-cultures de bactéries et champignons pour de nouveaux bio-fongicides". Electronic Thesis or Diss., Université de Lille (2022-....), 2022. https://pepite-depot.univ-lille.fr/ToutIDP/EDSMRE/2022/2022ULILR074.pdf.
Texto completo da fonteThe genus Fusarium causes plant pathologies affecting a wide variety of targets with consequences on yields and consumer health. Among them, F. graminearum and F. oxysporum have the most important economic impacts and sustainable control methods against these pathogens are currently limited. Biocontrol is an alternative to synthetic pesticides. However, it is difficult to fully exploit the potential that exists in nature. One way to discover new molecules of interest is co-culture. Involving two or more populations of cells, it recreates interactions that do not exist in monocultures. The aim of this thesis project was to bring together bacteria and fungi with known activities, and thus to discover associations producing cocktails of antifungal molecules to fight against phytopathogens.The project started with the rational selection of microorganisms with antifungal activity reported in the literature: five bacteria (Bacillus subtilis, Pseudomonas syringae, Dietzia sp., Streptomyces coelicolor, Streptomyces sp.) and five fungi (Pseudozyma aphidis, Trichoderma harzianum, Aspergillus oryzae, Cladosporium cladosporioides, and F. oxysporum) were chosen. Subsequently, culture conditions (medium, temperature) adequate to perform co-cultures and allow the growth of both partners involved were defined and three media were chosen: two rich media (LB, NB) and one minimal medium (GMM).After this selection, tests in a microbioreactor (BioLector) were carried out: these involved the ten selected microorganisms in monocultures and twenty-five co-cultures in the three media conditions. A screening of the antifungal activity of the generated culture supernatants was performed against an environmental strain of F. oxysporum and S. cerevisiae. Thirteen out of twenty-five co-cultures showed activity against at least one of the two targets. After these tests, the selection of co-cultures of interest was reduced from twenty-five to ten. These co-cultures were grown in 50 mL volumes in LB and NB media that showed the best activity under the chosen conditions, and their supernatants tested for antifungal activity. These tests allowed to refine the choice and to focus on six couples: P. syringae + A. oryzae, Streptomyces sp. + A. oryzae, P. syringae + F. oxysporum, P. syringae + P. aphidis, Dietzia sp. + T. harzianum, Streptomyces sp. + C. cladosporioides. These six couples were subjected to a series of cultures and their supernatants tested on agar plates and in liquid media (against F. oxysporum). Three co-cultures showed a more pronounced activity, especially against F. oxysporum and stood out from the monocultures: Streptomyces sp. + A. oryzae, Streptomyces sp. + C. cladosporioides and P. syringae + A. oryzae. The Streptomyces sp. + C. cladosporioides co-culture showed synergistic activity in inhibiting or slowing the growth of F. oxysporum compared to monocultures alone, while P. syringae + A. oryzae and Streptomyces sp. + A. oryzae showed additive activity against F. oxysporum.For the three selected couples, the molecules produced and secreted were studied by proteomics and metabolomics. Whatever the co-culture considered, it induces the activation of genes that remained silent in monoculture. Thus, we can observe the expression of a very high proportion of proteins or secondary metabolites (38 to 50%) exclusively present in the supernatants of co-cultures. Moreover, among the molecules secreted de novo in the co-cultures, some known for their antimicrobial or even antifungal activities could be identified for the three couples that were studied
Roy, Geneviève. "Développement d'un agent de lutte biologique contre Heterobasidion annosum". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ43109.pdf.
Texto completo da fonteChen, Xin. "Efficacité de Harmonia axyridis (coleoptera : coccinellidae) comme agent de lutte biologique contre Myzus persicae (homoptera : aphididae)". Avignon, 1997. http://www.theses.fr/1997AVIG0005.
Texto completo da fonteLivros sobre o assunto "Fusarium – Lutte biologique contre"
1953-, Vincent Charles, e Coderre Daniel 1953-, eds. La Lutte biologique. Boucherville, Qué: Morin, 1992.
Encontre o texto completo da fonteLavallée, Robert. Lutte contre le charançon du pin blanc: Intervention et lutte biologique. Sainte-Foy, Qué: Centre de foresterie des Laurentides, 1997.
Encontre o texto completo da fonteYu, D. S. Ennemis naturels des ravageurs des cultures dans les provinces des Prairies. Ottawa, Ont: Ministère de l'agriculture, 1993.
Encontre o texto completo da fonteBeauvais, Michel. Les pires cauchemars du jardinier: [l'invasion a déjà commencé]. Paris: "Rustica" éd., 2013.
Encontre o texto completo da fonteFlint, Mary Louise. Natural enemies handbook: The illustrated guide to biological pest control. Oakland, Calif: UC Division of Agriculture and Natural Sciences, 1998.
Encontre o texto completo da fonteInternational Symposium on Biological Control of Weeds (6th 1984 University of British Columbia). Proceedings of the VI International Symposium on Biological Control of Weeds. [Ottawa]: Agriculture Canada, 1986.
Encontre o texto completo da fonteLévesque, Micheline. Les vers blancs: Toutes les pratiques écologiques pour contrôler ces ravageurs. Boucherville, Québec: Bertrand Dumont, 2010.
Encontre o texto completo da fonteSzwarc, Michael. Ionic polymerization and living polymers. New York: Chapman & Hall, 1993.
Encontre o texto completo da fonteRechcigl, Jack E. Biological and biotechnological control of insect pests. Boca Raton, Fla: Lewis Publishers, 1998.
Encontre o texto completo da fonteRechcigl, Jack E. Biological and biotechnological control of insect pests. Boca Raton, Fla: Lewis Publishers, 1999.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Fusarium – Lutte biologique contre"
Léval, Henri. "Chapitre 2 - La lutte contre l'arme chimique et biologique". In Faire la paix, 51–77. Presses de Sciences Po, 2009. http://dx.doi.org/10.3917/scpo.devin.2009.01.051.
Texto completo da fonteDell’Omodarme Invernizzi, Marco Renzo. "Family Business ou les risques de la communauté dans 24 heures chrono". In 24 heures chrono, naissance du genre sécuritaire ? Librairie Philosophique J. Vrin, 2022. http://dx.doi.org/10.53984/philoseries07206.
Texto completo da fonte