| Autor: |
Kellerhals, Markus, Furrer, Beat |
| Zdroj: |
Euphytica; February 1994, Vol. 77 Issue: 1-2 p31-35, 5p |
| Abstrakt: |
Summary: In most apple breeding programmes resistance to diseases has a high priority. The main emphasis is put on scab and mildew resistance. Recent evidence about the risk of breakdown of the Vf scab resistance demonstrates the need to search for new approaches in disease resistance breeding. The following options might be considered: discover and exploit new sources of resistance to enlarge the genetic basis of resistance; accumulate different functional resistances in one genotype; develop orchard designs in order to increase diversity in the host-pathogen interactions and establish a resistance management system. To implement these strategies the genetic structure of the resistance must be examined by using modern methods of molecular biology. Resistance donors and advanced selections should be examined under high natural inoculum pressure at several locations around the world. We examined the possibility of identifying polygenic or partial scab resistance in apple. Nineteen apple varieties and selections, among them the differential hosts for scab races 1 to 5, were artificially inoculated in the glasshouse with scab conidia. The leaf symptoms were analysed macroscopically and microscopically There were significant differences which are actually exploited in our breeding programme. Conclusions are drawn towards new approaches for breeding and growing apples with durable disease resistance. |
| Databáze: |
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