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Descripción
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| In nature, the plant-microbe interactions vary along a continuum from mutualism (positive interactions, beneficial for both organisms) in one extreme, to antagonism (negative interactions, where the parasite takes profit and harms the host) in the other, passing through different degrees of neutral interactions (commensalism) in the middle. It is known that, in certain circumstances, mutualistic microorganisms can become parasites and vice versa. In fact, commensalism and mutualism require a complex balance between the nutritional demands of the symbiont and the benefits obtained by the host. The symbiotic continuum in the interactions between plants and fungi is very well exemplified by endophytes. The term ?fungal endophyte? refers to fungi that inhabit plants without causing visible disease symptoms. Endophytes are ubiquitous through the plant kingdom and have been found in all type of habitats. The endophytic lifestyle shoud strictly be considered as commensalism, but many endophytes display a considerable phenotypic plasticity in the interactions that they establish with the host, ranging from mutualism to antagonism. It has been proposed that host-endophyte asymptomatic interactions involve a balance of antagonisms where there is a certain degree of virulence on the part of the fungus enabling infection, whereas defence of the plant host limits developmental of fungal invaders and disease. Ecological, physiological and genetic factors from both host and endophyte would maintain or break this balance, determining the outcome of the interaction. However, despite the ubiquity of fungal endophytes, functional studies that could prove this hypothesis are scarce. Using an experimental system that includes the host A. thaliana has great advantages. A. thaliana is the best studied model plant, its genome has been sequenced and there is a great amount of available information about its genetics and functional genomics. Most of the available knowledge about plant-pathogen interactions comes from systems that have A. thaliana as host. More recently, the evolutive aspects of this interaction are also being studied in natural and experimental pathogen and host populations. The availability of endophytic isolates naturally infecting A. thaliana offers a great opportunity to study the factors affecting the outcome of the interactions between fungi and plants and, hence, to better understand the origin of disease. We have surveyed different populations of A. thaliana from Central Spain, with the isolation of a high diverse number of fungal species from surface-desinfected samples from aerial organs of asymptomatic plants. Species of the most abundant genera were chosen in order to set into a point their inoculation to A. thaliana under controlled conditions and investigate the outcome of the interactions. | |
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Internacional
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Si |
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Nombre congreso
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Conference Jacques Monod ?New and Emerging Fungal Diseases of Animals and Plants: evolutionary aspects in the context of global changes? |
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Tipo de participación
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960 |
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Lugar del congreso
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Roscoff, Francia |
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Revisores
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Si |
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ISBN o ISSN
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000-00-000 |
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DOI
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Fecha inicio congreso
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25/06/2011 |
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Fecha fin congreso
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29/06/2011 |
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Desde la página
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107 |
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Hasta la página
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107 |
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Título de las actas
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Abstracts |