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Descripción
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| Plants have developed a variety of mechanisms to compensate for the cost of biotic and/or abiotic stresses. In one of the tactics, host can go through life-history modifications that compensate for the negative effects of parasitism, which is considered part of tolerance mechanisms. Life-history theory makes predictions for the adjustment of resource investment by organisms, based on the notion that trade-offs exist between resources allocated to different fitness components: growth, reproduction and survival. Thus, parasite infection may modify optimal resource distribution and consequently induce plastic modifications to the host. Models for evolution of resource allocation predict that parasitized organisms will allocate more resources to reproduction, subtracting them from those dedicated to growth and survival. Our group tested predictions of life-history evolution theory in the plant-parasite system Arabidopsis thaliana and the generalist virus Cucumber mosaic virus (CMV). It was shown that plastic modifications upon CMV infection were substantial compared to mock inoculated plants, with a general reduction of growth and reproductive effort detected following infection as well as a tendency to increase the age at maturity. More specifically, such modification in allocation of resources due to infection and life-history responses was different depending on the allometric features of Arabidopsis genotypes and two groups were distinctively significant, with group1 genotypes being on average more tolerant than those of group2. Since tolerance is a quantitative trait based on phenotypic plasticity upon infection, the optimal amount of resources allocated to each of these components may be corrected according to environmental conditions in order to maximize the organism?s fitness. Hence, tolerance might be environment-dependent. To test this hypothesis, four Arabidopsis ecotypes (2 from each allometric groups) were inoculated with CMV and grown in similar conditions [16h light (150 ?mol.S-1.m-2)/8h dark] with the exception of the temperature [17°C, 22°C and 27°C]. Mock-inoculated plants were compared with those infected with LS-CMV, and the following results are the most representative of many changes observed in the phenologic and phenotypic traits tested. | |
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Internacional
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Si |
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Nombre congreso
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14e Rencontres de Virologie Végétale |
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Tipo de participación
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960 |
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Lugar del congreso
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Aussois (Francia) |
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Revisores
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Si |
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ISBN o ISSN
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00-0000-00 |
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DOI
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Fecha inicio congreso
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13/01/2013 |
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Fecha fin congreso
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17/01/2013 |
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Desde la página
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74 |
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Hasta la página
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74 |
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Título de las actas
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Résumés |