Hydrangea Cultivar YHLAX15 pH-Dependent Inflorescence Color
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Solution Overview
Problem
Current Hydrangea cultivars lack varieties with violet-blue colored inflorescences under acidic growing conditions and wavy sepal margins, which are desirable traits for horticultural interest.
Innovation Solution
The development of a new Hydrangea macrophylla cultivar 'YHLAX15' through controlled breeding, combining the traits of light violet-blue colored inflorescences, wavy sepal margins, medium green foliage, and a moderately vigorous upright growth habit, achieved by cross-pollination between proprietary selection TKH2000 and 'Kiyosumi sawa', and stabilized through asexual reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional Hydrangea cultivars are used, then they have established growth habits and foliage characteristics, but they lack the combination of violet-blue colored inflorescences under acidic growing conditions and wavy sepal margins
Solution Approach 1:
The patent applies parameter changes by selecting and breeding for specific phenotypic traits including wavy sepal margins and pH-dependent inflorescence coloration. The cultivar 'YHLAX15' exhibits variable inflorescence color (violet-blue under acidic conditions, pink under alkaline conditions) which represents a change in chemical parameters of the plant in response to environmental pH conditions, while simultaneously maintaining the morphological parameter of wavy sepal margins.
2Manufacturing precision
If new breeding combinations are created to achieve desired traits, then novel characteristics like wavy sepal margins and violet-blue coloration are achieved, but the breeding process becomes more complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by performing controlled cross-pollination between specifically selected parent plants (TKH2000 and 'Kiyosumi sawa') to pre-establish the desired genetic combination for wavy sepal margins and violet-blue coloration before mass propagation. This preliminary breeding phase creates a stabilized genotype that can then be replicated through asexual propagation, avoiding the need for repeated breeding cycles.
Solution Approach 2:
The patent applies copying by using asexual propagation methods to replicate the novel cultivar 'YHLAX15' exactly as it was bred. Once the desired combination of wavy sepal margins and violet-blue coloration was achieved through breeding, the cultivar is copied through vegetative propagation to maintain trait fidelity across multiple plants without requiring further breeding iterations.
3Reliability
If asexual propagation is used to stabilize the cultivar, then true-to-type reproduction is achieved, but the initial breeding and selection process requires significant time and controlled conditions
Solution Approach 1:
The patent applies self-service by allowing the selected parent plants to naturally produce progeny through controlled cross-pollination, with the novel traits emerging spontaneously in the offspring. The plant system itself performs the breeding function rather than requiring external intervention for each generation, once the initial cross is established. This natural reproductive process, combined with visual selection of desired traits, reduces the need for complex external control mechanisms.
Data Source
AI summary
A new and distinct cultivar of Hydrangea plant named ‘YHLAX15’, characterized by its light pink-colored inflorescences under alkaline growing condition, light violet-blue colored inflorescences under acidic growing conditions, medium green-colored foliage, and moderately vigorous, upright growth habit, is disclosed.