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Descripción
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| Despite that plant viruses are virulent crop parasites, and that resistance in crops selects for increased pathogenicity in viruses, virus evolution in crops is poorly understood, and there is no clear demonstration of plant-virus co-evolution. We have analysed the reciprocal effects of virulence and defence of viruses and plants on plant and virus fitness, and on whether they lead to co-evolution. Results derive from analyses of tobamovirus that are controlled, or overcome, different resistance alleles at the L locus bred into cultivars of pepper (Capsicum annuum) crops according to a gene-for-gene (GFG) interaction. As predicted by models of the evolution of GFG systems, data on the long-term evolution of field tobamovirus populations suggested that evolution to increased pathogenicity in response to the selection exerted by resistance would have fitness penalties. These penalties were experimentally demonstrated in experiments in which virus multiplication of isolates belonging to different pathotypes were assayed in different host genotypes either in single infection or in competition in mixed infection. Overcoming of L-gene resistance depends on amino acid substitution in the virus coat protein, and we also show that these changes affect the stability of the virions and, hence, their survival out of the host cells. Thus, resistance in the plant selects for traits in the virus population related to the plant-virus interaction, as is increased pathogenicity, and for trait unrelated to the plant-virus interaction, such as altered survival, both traits affecting virus fitness. | |
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Internacional
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No |
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Nombre congreso
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XII Congreso Nacional de Virología |
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Tipo de participación
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960 |
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Lugar del congreso
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Burgos |
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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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09/06/2013 |
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Fecha fin congreso
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12/06/2013 |
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Desde la página
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59 |
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Hasta la página
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60 |
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Título de las actas
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Virología. Publicación oficial de la Sociedad Española de Virología |