Genetic predisposition of some apple progenies to burrknot

Burrknots are one of the undesirable characteristics of rootstock and cultivar due to increase disease and insect sensitivities, reduce cold resistance and cause differences in tree development.
Despite the climatic factors that promote burrknot formation, such as temperature and humidity, the genetic susceptibility has a great influence on it.
In this study, the tendency, location, size and density of burrknot in some apple genotypes obtained from controlled crosses have been analyzed.
The assessments were made on a total 1112 genotypes of four cross combinations composed of ‘Golden Delicious’, ‘Braeburn’, ‘Jerseymac’, ‘Priscilla’ and ‘William’s Pride’ cultivars.
Burrknot number, intensity and size varied to the combinations.
Burrknot severity was higher in ‘Golden Delicious’ × ‘Priscilla’ (24.20%) and ‘Braeburn’ × ‘William’s Pride’ (19.20%) hybrids than ‘Golden Delicious’ × ‘William’s Pride’ and ‘Jerseymac’ × ‘William’s Pride’. It was not observed in 84.93% of the ‘Jerseymac’ × ‘William’s Pride’ hybrids.

XXX International Horticultural Congress IHC2018: II International Symposium on Plant Breeding in Horticulture

E. Kaçal, G. Öztürk

hybridization, Malus, burrknot, physiological disorder, rootstock, Synanthedon scitula

https://doi.org/10.17660/ActaHortic.2020.1282.44