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Descripción
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| Sterilizing plant pathogens, i.e., those that drain the reproductive resources of infected hosts eventually leading to castration, may have devastating effects on host populations as they prevent host reproduction. The two main mechanisms of plant defense against such pathogens are resistance, i.e., the host?s ability to limit pathogen multiplication, and tolerance, i.e., the host?s ability to reduce the effect of infection on its fitness regardless of the level of pathogen multiplication. Theory predicts that selection for tolerance rather than resistance would be stronger against sterilizing pathogens because the cost of limiting pathogen multiplication would be much larger than the cost of limiting fitness effects. However, this prediction has been seldom experimentally tested. We have analyzed the level of resistance and tolerance of 18 Arabidopsis thaliana accessions against its natural sterilizing virus Turnip mosaic virus (TuMV). For both defense strategies, we have quantified the benefits in terms of increased plant fitness upon TuMV infection, and the costs as the fitness effects in uninfected individuals and the trade-offs with resistance/tolerance to other viruses. Results indicate that increased plant fitness upon TuMV infection is associated with tolerance rather than resistance, and that tolerance comes at the cost of increased susceptibility to other pathogens, but not of reduced fitness in uninfected plants. Tolerance also benefits TuMV, as it increases the virus infectious period and transmission efficiency. Thus, our results support theoretical predictions on the evolution of host defenses against sterilizing pathogens and contribute to better the costs of plant defenses against pathogens. | |
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Internacional
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No |
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Nombre congreso
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XIX Congreso de la Sociedad Española de Fitopatología |
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Tipo de participación
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960 |
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Lugar del congreso
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Toledo |
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Revisores
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Si |
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ISBN o ISSN
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000-00-0000-000-0 |
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DOI
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Fecha inicio congreso
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08/10/2018 |
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Fecha fin congreso
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10/10/2018 |
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Desde la página
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83 |
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Hasta la página
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83 |
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Título de las actas
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Libro de resúmenes |