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Descripción
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| More than 30% of all known plant viruses are seed transmitted. As 90% of crops are propagated by seeds, seed-transmitted viruses are a major agricultural concern. However, the genetic determinants of seed transmission are poorly understood. Viruses reach the seed by: (i) direct invasion of the embryonic tissue after fertilization and before the programmed cell death of the embryonic suspensor; and (ii) infection of ovules or pollen prior to fertilization. Hence, for seed transmission to occur it is crucial that the virus reaches plant reproductive organs before gametogenesis and/or while embryonic suspensor is still functional. Thus, virus genes involved in seed transmission would encode proteins controlling virus multiplication and movement. We have analyzed whether the level of virus multiplication and the speed of within-host invasion plays a role in the efficiency of seed transmission. To do so, we used Cucumber mosaic virus (CMV) and its natural host Arabidopsis thaliana. We conducted a time course infection experiment, in which six A. thaliana accessions were challenged against CMV genotypes with high and low seed transmission rates. The level of virus multiplication in plant growth and reproductive structures was monitored every two days, from inoculation at 6-leaves rosette stage to silique ripening, and seed transmission rate was estimated in the six accessions. In parallel, we compared the genomic sequences of the utilized CMV genotypes. Results indicated that faster virus movement leads to higher seed transmission, and that adaptation to this mode of transmission is linked to mutations in the CMV genome. Thus, our study provides novel information on the determinants of virus seed transmission. | |
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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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330 |
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Hasta la página
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330 |
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Título de las actas
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Libro de resúmenes |