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Pathogenicity and molecular characterization of an international collection of Verticillium dahliae, pathogen of sunflower

AuthorsGonzález-Fernández, Sara; Martín-Sanz, Alberto; Egea, Leticia A.; Hernández Molina, Pilar ; Molinero-Ruiz, Leire
Issue DateSep-2016
CitationXVIII Congreso de la Sociedad Española de Fitopatología (2016)
AbstractVerticillium wilt, caused by the soilborne fungus Verticillium dahliae, is one of the most important diseases in the world, causing high economic losses in crops such as artichoke, olive tree, cotton, sunflower, potato, tomato, etc. Since the disease is genetically controlled, knowing the virulence and genetic diversity of the pathogen are key factors to increase the effectiveness of control measures. Both have been the objectives of this study. An international collection of seven V. dahliae isolates from sunflower was pathogenically characterized in an experiment under greenhouse conditions. Eight sunflower genotypes were inoculated with the fungal isolates and their virulence was determined for eight weeks. The molecular characterization of 13 isolates of V. dahliae from sunflower and from olive tree was carried out using molecular markers generated by five microsatellite primers. Concerning the study of virulence, significant differences of disease were found for isolates, genotypes, and most interestingly, for their interaction. Our results show that, although all the isolates caused different symptoms severity in the plants, certain genotypes of sunflower were less susceptible to the disease than others. In addition, the new race of V. dahliae recently reported in Spain was also identified in France and in Rumania. On the other hand, molecular differences between isolates of V. dahliae were related to the host (sunflower or olive tree) and, within those from sunflower, to geographical origin, as reported for other pathogens of this crop.
DescriptionPóster presentado en el XVIII Congreso de la Sociedad Española de Fitopatología (SEF), celebrado en Palencia del 20 al 23 de septiembre de 2016.
Appears in Collections:(IAS) Comunicaciones congresos
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