Development of apple powdery mildew on sources of resistance to Podosphaera leucotricha, exposed to an inoculum virulent against the major resistance gene Pl-2
2007
Caffier, Valérie | Parisi, Luciana, L. | Unité de recherche Pathologie végétale et phytobactériologie ; Institut National de la Recherche Agronomique (INRA) | Unité Expérimentale Recherches Intégrées - Gotheron (UERI) ; Institut National de la Recherche Agronomique (INRA)
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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Show more [+] Less [-]English. The major resistance gene Pl-2 in apple has recently been shown to be overcome by a virulent population of powdery mildew, Podosphaera leucotricha, in genotypes of the fourth generation after introgression of Pl-2 from crab apple, Malus zumi. Tests of pathogenicity in controlled conditions and observations in an orchard showed that the initial progenitor of Pl-2, MAL 68/1, was overcome by a virulent inoculum. As a consequence, all selections derived from MAL 68/1 may lose their resistance to powdery mildew, if Pl-2 is used alone. Sources of resistance other than Pl-2 remained efficient to the virulent population: M. hupehensis, M. mandshurica, M. robusta, M. sargentii, M. sieboldii, D12, Mildew Immune Selection and 'White Angel'. The combination of Pl-2 with quantitative resistance genes resulted in a high level of resistance
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