Hemerocallis R10 Daylily Rust Resistance Breeding
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Solution Overview
Problem
The development of daylily cultivars resistant to daylily rust, while maintaining desirable landscape performance characteristics such as clear color, repeat blooming, strong flower scapes, and foliage appeal, has been hindered by the lack of effective resistance in existing varieties, particularly in environments with suboptimal care.
Innovation Solution
The cultivar 'R10' is bred to exhibit high resistance to daylily rust, characterized by bright red flowers, evergreen foliage, strong upright scapes, and prolonged blooming, achieved through a breeding program focusing on rust resistance without fungicide application, and propagated via root divisions to ensure stability across generations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional daylily cultivars are grown without fungicide application to test natural resistance, then rust resistance can be identified, but many cultivars are lost due to rust infection
Solution Approach 1:
The patent converts the harmful effect of rust disease into a beneficial selection mechanism. By intentionally growing cultivars without fungicides, the rust disease serves as a natural selection tool that eliminates susceptible cultivars and identifies resistant ones, thereby converting a harmful pathogen into a useful screening method for breeding rust-resistant daylilies
2Reliability
If daylily cultivars are bred for rust resistance, then disease resistance improves, but maintaining multiple desirable landscape characteristics becomes more difficult
Solution Approach 1:
The patent applies multi-functionality by developing a single cultivar 'R10' that simultaneously achieves multiple objectives: rust resistance, evergreen foliage, strong upright scapes, repeat blooming, and clear color. This universal approach consolidates multiple breeding goals into one cultivar that serves all landscape performance requirements without requiring separate specialized cultivars for each trait
3Productivity
If daylily cultivars are selected for strong landscape performance, then aesthetic qualities improve, but resistance to rust disease deteriorates
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the genetic parameters of daylily cultivars through selective breeding. Cultivar 'R10' exhibits changed parameters including rust resistance (from susceptible to resistant), foliage persistence (from deciduous to evergreen), and enhanced structural strength (from weak to strong upright scapes), thereby transforming the cultivar's inherent characteristics to simultaneously achieve both aesthetic quality and disease resistance
Data Source
AI summary
A new and distinct Hemerocallis cultivar named ‘R10’ is disclosed, characterized by its excellent landscape performance, resistance to daylily rust, bright red flower color, with a slightly darker eye and yellow-green throat. Plants have strong scapes and evergreen foliage. The new variety is a Hemerocallis, normally produced as an outdoor garden plant.