ISHS Acta Horticulturae 484: Eucarpia Symposium on Fruit Breeding and Genetics
EVALUATION OF FRUIT TREE GENETIC RESOURCES AS SOURCES OF POLYGENIC SCAB RESISTANCE IN AN APPLE BREEDING PROGRAMME |
| Authors: | M. Lateur, C. Wagemans, C. Populer |
| Abstract:
Data are presented on a new research project aimed at assessing new cultivars with presumed polygenic scab resistance as parent material in breeding work. Old cultivars combining moderate susceptibility to scab (Venturia inaequalis) and, where possible, to powdery mildew (Podosphaera leucotricha) and canker (Nectria galligena), with desirable pomological characters were selected for use as parents and crossed with each other, or with modern commercial cultivars or with cultivars carrying the Vƒ gene. In the latter case, the aim was to improve the durability of the Vƒ scab resistance. In crosses involving only parents with moderate resistance to scab in the field, presumed to be under polygenic control, the percentage of seedlings emerging from the greenhouse scab inoculation tests varied from 10 to 48% according to the parent combinations. The greenhouse scab inoculation test, adapted to the evaluation of seedlings with quantitative resistance, has produced results in accordance with subsequent field behaviour. | |
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