Impact of tobacco recessive resistance gene va on biological properties of Brazilian potato virus Y (PVY) isolates
2011
Lacroix, Christelle | Glais, L. | Verrier, J-L. | Charlier, C. | Lorencetti, C. | Jacquot, Emmanuel | Biologie des organismes et des populations appliquées à la protection des plantes (BIO3P) ; Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST | SEITA | Fédération Nationale des Producteurs de Plants de Pomme de Terre (FN3PT) | Universidade de Santa Cruz do Sul (UNISC) | Alliance One Brazil Exportadora de Tabacos Ltda ; Partenaires INRAE | We are grateful to Dr Yannick Outreman and Dr Luc Madec for statistical analyses, to Dr Thomas Baldwin for critical reading of the manuscript, and to Agnes Delaunay and Laize Espindula for technical support. The work presented was supported by the Institut National de la Recherche Agronomique (France), Imperial Tobacco Group, Alliance One and the Association for Research for Nicotianae.
Publication Inra prise en compte dans l'analyse bibliométrique des publications scientifiques mondiales sur les Fruits, les Légumes et la Pomme de terre. Période 2000-2012. http://prodinra.inra.fr/record/256699
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Mostrar más [+] Menos [-]Inglés. To investigate the role of environmental conditions on the selection of virulent Potato virus Y (PVY) isolates subject to pressure from the recessive resistance gene va in tobacco, a field survey was performed in Brazil where va-derived genotypes have been recently introduced and now represent less than one-third of cultivated tobacco genotypes. A serological analysis of 397 leaves collected from different Brazilian tobacco-growing areas and mainly from plants with symptoms indicated that 52-4% of samples were infected by at least one of the viral species tested. PVY was present in 72.1% of infected samples. The probability of a plant being infected with PVY was reduced in va hosts. However, the biological characterization of PVY isolates on indicator hosts showed that 20 of the 29 tested isolates were able to overcome the alleles of the va gene. Moreover, the observed biological diversity of isolates was higher in susceptible tobacco genotypes than in va-resistant ones. Comparison of these data with the PVY diversity in French tobacco fields shows that the use of va-derived genotypes in two environments with contrasting climatic conditions, local hosts and cultural contexts, leads to a similar outcome: the prevalence of virulent isolates. These results strongly suggest an important role of the va gene in the modification of PVY populations.
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