Hydrangea macrophylla 'H218924' Breeding for Vigor and Longevity
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Solution Overview
Problem
Current Hydrangea cultivars lack strong and freely-branching plants with uniform flowering habits, large inflorescences, and attractive sterile flower colors, as well as good post-production longevity.
Innovation Solution
A new cultivar, Hydrangea macrophylla 'H218924', resulting from a cross-pollination between Hydrangea macrophylla 'H212905' and 'Horklewi', exhibits upright and uniformly mounded growth, vigorous branching, large lacecap-type inflorescences with yellow-green to white sterile flowers, and prolonged flower longevity, achieved through vegetative tip cutting propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional Hydrangea cultivars are used, then they have basic growth and flowering, but they lack strong freely-branching stems, uniform flowering habit, large inflorescences with numerous showy sterile flowers, and good postproduction longevity
Solution Approach 1:
The patent applies parameter changes by selecting and breeding for specific quantitative traits including stem strength, branching frequency, inflorescence size, and flower number. The new cultivar exhibits measurable improvements in these parameters compared to parent cultivars, achieving both high productivity and reliability through optimized biological parameters
2Shape
If Hydrangea macrophylla 'H212905' is used as parent, then it provides a baseline for comparison, but it lacks the freely branching habit and large lacecap inflorescences with numerous sterile flowers
Solution Approach 1:
The patent merges traits from two parent cultivars: Hydrangea macrophylla 'H212905' and Hydrangea macrophylla 'Horklewi'. The hybrid combines the lacecap inflorescence type from one parent with the freely branching habit and high sterile flower production from the other, achieving superior productivity and shape that neither parent possesses alone
3Productivity
If Hydrangea macrophylla 'Horklewi' is used as parent, then it contributes to the hybrid vigor, but it has mophead-type inflorescences instead of lacecap-type
Solution Approach 1:
The patent applies local quality by allowing different parts of the plant to express different parental traits: the vegetative growth and branching habit exhibit vigor and freedom from the Horklewi parent, while the inflorescence structure expresses the lacecap type from the other parent. This spatial separation of traits enables the plant to exhibit both vigor and desired inflorescence morphology
4Quantity of substance
If Hydrangea macrophylla 'H211903' is compared, then it provides a reference cultivar, but it has smaller panicles with fewer flowers and different sterile flower color
Solution Approach 1:
The patent achieves parameter changes by breeding for increased panicle size, higher flower count, and modified sterile flower color. The new cultivar produces significantly larger panicles with more flowers and displays yellow-green to white sterile flowers instead of the bright pink color of the reference cultivar, demonstrating successful parameter optimization
Data Source
AI summary
A new and distinct cultivar of Hydrangea plant named ‘H218924’, characterized by its upright and uniformly mounded plant habit; vigorous growth habit and rapid growth rate; freely branching habit with strong, thick and sturdy stems; freely and uniformly flowering habit; large lacecap-type inflorescences with numerous sterile flowers that are yellow green to white in color; and good postproduction longevity.