Hemerocallis WF7-155 Rust Resistance Breeding via Harm Conversion
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Solution Overview
Problem
The development of daylily cultivars resistant to daylily rust, while maintaining desirable landscape performance characteristics such as repeat blooming, rust resistance, and vigor, has been hindered by the need to eliminate susceptible cultivars through fungicide-free selection processes, resulting in losses and limited environmental testing.
Innovation Solution
The cultivar 'WF7-155' is developed through a breeding program focusing on rust resistance and other desirable traits, characterized by yellow flowers, early to mid-season blooming, repeat blooming, and high resistance to daylily rust, achieved without fungicide application, and propagated via root divisions, demonstrating stability across generations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fungicide-free selection process is used to determine rust resistance, then rust resistance is improved, but loss of cultivars increases
Solution Approach 1:
The patent converts the harmful effect of rust disease into a beneficial selection mechanism. By intentionally exposing seedlings to rust conditions without fungicide application, the breeding program identifies and preserves rust-resistant cultivars while eliminating susceptible ones, turning a destructive pathogen into a tool for improving overall program resistance
2Adaptability or versatility
If multiple environmental conditions are tested, then adaptability is improved, but testing time and complexity increase
Solution Approach 1:
The patent implements preliminary environmental testing during the confidential evaluation phase (5-10 years) before commercial release. Cultivars are evaluated in controlled nursery conditions with overhead sprinklers and full sun exposure, establishing baseline performance data that predicts field adaptability and reduces the need for extensive post-release environmental testing
Solution Approach 2:
The breeding program uses its own nursery infrastructure (plastic containers, pinebark medium, overhead sprinklers, full sun exposure) to conduct self-contained environmental evaluations. This self-service testing system allows the program to assess cultivar performance across multiple generations without relying on external testing facilities, reducing time and resource requirements
Data Source
AI summary
A new and distinct Hemerocallis cultivar named ‘WF7-155’ is disclosed, characterized by its excellent landscape performance, resistance to daylily rust, yellow flower color, with a small green throat. Plants have dark green Winter dormant foliage. The new variety is a Hemerocallis, normally produced as an outdoor garden plant.