Pl2 resistance gene differentiates the pathogenicity in four "Plasmopara halstedii" (sunflower downy mildew) races 304, 704, 314 and 714
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29/09/2015
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| Resumo |
In order to clarify the role of Pl2 resistance gene in differentiation the pathogenicity in Plasmopara halstedii (sunflower downy mildew), analyses were carried out in four pathotypes: isolates of races 304 and 314 that do not overcome Pl2 gene, and isolates of races 704 and 714 that can overcome Pl2 gene. Based on the reaction for the P. halstedii isolates to sunflower hybrids varying only in Pl resistance genes, isolates of races 704 and 714 were more virulent than isolates of races 304 and 314. Index of aggressiveness was calculated for pathogen isolates and revealed the presence of significant differences between isolates of races 304 and 314 (more aggressive) and isolates of races 704 and 714 (less aggressive). There were morphological and genetic variations for the four P. halstedii isolates without a correlation with pathogenic diversity. The importance of the Pl2 resistance gene to differentiate the pathogenicity in sunflower downy mildew was discussed. Con objeto de clarificar la acción del gen de la resistencia Pl2 en la diferenciación de la patogenicidad en Plasmopara halstedii (mildiu del girasol) se han realizado análisis en cuatro patotipos: aislados de las razas 304 y 314 que no superan el gen Pl2, y aislados de las razas 704 y 714 que pueden superar al gen Pl2. Basados en la reacción de los aislados de P. halstedii sobre los híbridos de girasol que solo varían en la resistencia a los genes Pl, los aislados de las razas 704 y 714 fueron más virulentos que los aislados de las razas 304 y 314. Se ha calculado un índice de agresividad para los aislados patógenos de las razas 304 y 314 (más agresivos) y los aislados 704 y 714 (menos agresivos). Se han encontrado diferencias morfológicas y variaciones genéticas para los cuatro aislados de P. halstedii pero sin correlación con la diversidad patogénica. Se discute la importancia de la resistencia del gen Pl2 para diferenciar la patogenicidad en el mildiu del girasol. |
| Formato |
application/pdf |
| Identificador |
http://revistas.ucm.es/index.php/BOCM/article/view/49130 10.5209/rev_BOCM.2015.v39.49130 |
| Publicador |
Ediciones Complutense |
| Relação |
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| Fonte |
Botanica Complutensis; Vol 39 (2015); 19-29 |
| Palavras-Chave | #aggressiveness; avirulence Avr gene; Helianthus annuus; virulence. #agresividad; gen de avirulencia Avr; Helianthus annuus; virulencia. |
| Tipo |
info:eu-repo/semantics/article Artículo revisado por pares info:eu-repo/semantics/publishedVersion |
