This work package is aimed at the establishment of pre-breeding material in apple and peach in a more efficient way and the improvement and application of a fast-breeding system in apple. Pre-breeding material can be defined as material carrying new traits or trait combinations which can be used as donors to improve cultivar breeding by the introduction of the traits. The development of pre-breeding material is necessary if desired traits or combinations are not present in existing advanced breeding material and if the donors are far from advanced breeding material and/or the introduction process is too time consuming or expensive. Prebreeding material with new resistance genes, new combinations of resistance and/or quality traits and material homozygous for important traits necessary and useful for breeders to improve breeding of apple and peach cultivars more suited for sustainable production and the increasing demands of the markets will be developed. The efficiency of pre-breeding will be increased by the choice of donors and the selection of progeny with less genetic drag (apple and peach) and the development of strategies to shorten the generation cycle in apple.
The targeted traits are:
For apple: resistance to scab (Rvi11/Vbj, Rvi12/Vb), resistance to fire blight (Fb-ELG10, Fb-R5-LG3), pyramiding resistance to powdery mildew (Pl1, Pl2, Pld), homozygosity of scab resistance genes. The traits chosen are either still not introduced in domesticated apple or not present in more advanced breeding material which could be used for cultivar development. Until now no material is available with three pyramided powdery mildew resistance genes or clones homozygous for pyramided scab resistance genes.
For peach: resistance to powdery mildew (Vr1, Vr2), Monilinia, green peach aphid (Rm1, Rm2); combination of resistance genes.
New traits can be added depending on the results of WP5.