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Detection of an unstable minor QTL linked to fire blight resistance on linkage group 16 of Malus fusca

GND
1211645738
Affiliation
Julius Kühn-Institute (JKI), Institute for Breeding Research on Fruit Crops, Germany
Emeriewen, Ofere F.;
GND
1059141744
Affiliation
Julius Kühn-Institute (JKI), Institute for Resistance Research and Stress Tolerance, Germany
Richter, Klaus;
GND
1059102854
Affiliation
Julius Kühn-Institute (JKI), Institute for Plant Protection in Fruit Crops and Viticulture, Germany
Wensing, Annette;
Affiliation
Research and Innovation Centre, Fondazione Edmund Mach (FEM), Italy
Mickael Malnoy,;
GND
172861896
Affiliation
Julius Kühn-Institute (JKI), Institute for Breeding Research on Fruit Crops, Germany
Peil, Andreas

Objective Erwinia amylovora causes fire blight disease in Malus. A strong resistance QTL (Mfu10) was previously detected on linkage group 10 of Malus fusca accession MAL0045, using several strains of the bacterium. As no strain capable of breaking the resistance of MAL0045 has been found, it was hypothesized that a second resistance factor contributes to the fire blight resistance of MAL0045. However, to date, no minor locus has been detected with previously published strains of the bacterium. We detected a minor QTL only on a subset of a population following inoculation with strain Ea1038, which heterologously expresses an effector in a derivative of isolate Ea3049. Two genetic maps of MAL0045, one scarce, the other dense with markers, were used for QTL analyses.

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