Monitoring of Venturia inaequalis virulences
One of the strategies that can be used to develop
apple cultivars with (more) durable apple scab resistance is the
pyramiding of several major genes (preferably reinforced by QTLs)
in the same background. But which genes are the best suited to
produce apple cultivars with durable resistance? The most interesting
genes are surely those which have not been overcome by the pathogen.
However also genes which have been overcome by the pathogen, but
only in limited areas (limited spread of the virulence), may be
used in breeding.
Unfortunately the search of this information (breakdown of a R-gene
and geographic distribution of the virulent isolates) is difficult
and time consuming. Moreover most of the time the reports found are
not up-dated, the correctness of the data difficult to verify, and
because generally different differential hosts have been used, they
are difficult to compare. To solve all these problems the project “Monitoring
of Venturia inaequalis virulences” has been proposed.
The project is subdivided in three parts:
1) The establishment of a large network of orchards where sets of
differential hosts are planted; CLICK
2) The scoring of the plants using a defined scale and submission
of the data to the curator of the project CLICK
3) The publication of the summary of the collected data through the
homepage of the project CLICK