Related Experiment Videos
[Breeding for digenic apple resistance to scab].
1All-Russian Research Institute of Horticultural Breeding, Orel, 302530 Russia. vniispk@valley.ru
Genetika
|February 11, 2003
Summary
Apple breeding achieved digenic scab resistance using Vf and Vm genes. This long-term strategy identified specific resistant and susceptible seedlings for future cultivar development.
Area of Science:
- Plant genetics
- Horticultural science
- Disease resistance breeding
Context:
- Reviewed long-term apple breeding for digenic resistance to scab (1979-2000).
- Utilized hybrid seeds from reciprocal crosses between Vf and Vm resistance gene donors.
- Examined backcrossed progeny with susceptible cultivars via greenhouse inoculation.
Purpose:
- To review results of digenic resistance breeding in apples.
- To propose criteria for identifying parental forms and cultivars with VfvfVmvm genotype.
Summary:
- Hybrid seeds from Vf and Vm gene donors were crossed and backcrossed with susceptible cultivars.
- Seedlings were inoculated at the true leaf stage to assess resistance.
- Criteria for VfvfVmvm genotype included a 3:1 resistant to susceptible seedling ratio and distinct resistance phenotypes.
Impact:
- Established criteria for selecting superior apple genotypes for scab resistance.
- Provided a foundation for developing durable scab-resistant apple cultivars.
- Demonstrated the effectiveness of digenic resistance breeding over monogenic approaches.