Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Arabidopsis thaliana AND ITS NATURAL ENDOPHYTES: A MODEL SYSTEM FOR THE STUDY OF THE ECOLOGICAL AND MOLECULAR FACTORS INVOLVED IN THE EVOLUTION OF VIRULENCE
Year:2011
Research Areas
  • Plants and animal biology and ecology,
  • Crop production
Information
Abstract
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.
International
Si
Congress
Conference Jacques Monod ?New and Emerging Fungal Diseases of Animals and Plants: evolutionary aspects in the context of global changes?
960
Place
Roscoff, Francia
Reviewers
Si
ISBN/ISSN
000-00-000
Start Date
25/06/2011
End Date
29/06/2011
From page
107
To page
107
Abstracts
Participants
  • Autor: Elena García (UPM)
  • Autor: Angela Alonso Gonzalez (UPM)
  • Autor: M. Brisa Ramos Martinez (UPM)
  • Autor: Gonzalo Platas (Centro de Excelencia en Investigación MEDINA, Granada)
  • Autor: Soledad Sacristan Benayas (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Interacciones Moleculares Planta-Patógeno
  • Grupo de Investigación: Patología Vegetal
  • Centro o Instituto I+D+i: Centro de Biotecnología y Genómica de Plantas, CBGP
  • Departamento: Biotecnología
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