Development of apple powdery mildew on sources of resistance to  Podosphaera leucotricha , exposed to an inoculum virulent against the major resistance gene  Pl‐2 | Zendy

Caffier V. | Zendy; Parisi L. | Zendy

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Development of apple powdery mildew on sources of resistance to Podosphaera leucotricha , exposed to an inoculum virulent against the major resistance gene Pl‐2

Author(s) -

Caffier V.,

Parisi L.

Publication year - 2007

Publication title -

plant breeding

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.583

H-Index - 71

eISSN - 1439-0523

pISSN - 0179-9541

DOI - 10.1111/j.1439-0523.2007.01351.x

Subject(s) - powdery mildew , biology , virulence , population , mildew , orchard , malus , botany , horticulture , gene , genetics , demography , sociology

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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