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Imprint
Development of molecular markers for breeding apple cultivars with durable scab and powdery mildew resistance
Project
Project code: JKI-ZGO-08-4131
Contract period: 01.01.2003
- 31.12.2007
Purpose of research: Applied research
Molecular techniques are used to identify molecular markers for resistance genes in apple. Easy-to-use DNA markers such as SCAR markers are developed for 'strong' scab resistance genes, i.e. Vr from the 'Russian seedling' apple genotype as well as for powdery mildew resistance genes of different Malus species. Polygenic scab and mildew resistances of Malus wild species and old European apple cultivars are characterised predominantly with modern molecular mapping strategies such as QTL- (Quantitative Trait Locus) mapping.
The project aims at the development and practical application of molecular markers allowing a safely molecular characterization of genetic resources with respect to fungal resistances in Malus and an usage in the framework of marker assisted apple breeding.
Durable resistance against scab and powdery mildew, caused by the fungi Venturia inaequalis and Podosphaera leucotricha, is one of the main objectives in apple breeding. In the case of apple scab the occurrence of new virulent races that are able to overcome the most important resistance used so far in breeding has forced the search for new resistance sources as well as the better characterization of already known resistances in cultivars and wild species. Also in powdery mildew the existence of races has already been described. Beside the usage of polygenic resistances in future apple breeding programmes, the pyramiding of different specific monogenic resistances in one single genotype is already in progress. The latter strategy needs the availability of a set of diagnostic DNA markers to detect the desired gene combinations in a resistant plant.
Section overview
Subjects
- Plant Breeding
- Arboriculture
- Climate Change
Framework programme
Funding programme
Excutive institution
Institute for Breeding Research on Horticultural Crops (JKI-ZG)
