Hydrangea H2002 Cultivar Breeding for Double Sterile Flowers
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Solution Overview
Problem
There is a need for new cultivars of Hydrangea macrophylla with unique flower colors and double flowers, as existing cultivars lack the desired traits such as double sterile flowers, free flowering, and repeating blooming habits.
Innovation Solution
The development of a new cultivar 'H2002' with double sterile flowers, light yellow-green to white sepals with red margins, free flowering and repeating blooming habit, rounded mop-head inflorescences, and greyed-red young foliage, achieved through controlled breeding between Hydrangea macrophylla and Hydrangea macrophylla 'Yamaajisai', with stable characteristics reproduced via asexual propagation by softwood stem cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If controlled breeding is conducted to develop new Hydrangea cultivars with unique flower colors and double flowers, then the flower color uniqueness and double flower traits are improved, but the breeding time and complexity increase
Solution Approach 1:
The patent applies preliminary action by conducting controlled breeding between selected parent plants (Hydrangea macrophylla 'Yamaajisai' and another Hydrangea macrophylla) before the actual cultivar development. The parent plants were pre-selected for specific traits including flower color and double flower characteristics, allowing the breeding process to efficiently produce offspring with desired unique flower colors and double flower traits while reducing overall breeding time
2Stability of the object's composition
If asexual propagation by softwood stem cuttings is used to reproduce the new cultivar, then the stability and true-to-type reproduction of characteristics are improved, but the propagation complexity increases
Solution Approach 1:
The patent applies copying by using asexual propagation through softwood stem cuttings to create exact genetic copies of the new Hydrangea cultivar. This method produces multiple identical plants with stable, true-to-type reproduction of all characteristics including double sterile flowers, sepal coloration, and plant habit, ensuring consistency without requiring complex genetic manipulation techniques
3Adaptability or versatility
If double sterile flowers are developed in the Hydrangea cultivar, then the aesthetic uniqueness is improved, but the reproductive capability is lost
Solution Approach 1:
The patent applies taking out by removing the reproductive function from the flowers while preserving and enhancing the aesthetic characteristics. The new Hydrangea cultivar produces double sterile flowers that lack functional reproductive organs, allowing the plant to allocate resources toward developing larger, more visually striking double flowers with unique color patterns, thereby improving aesthetic uniqueness while accepting the trade-off of lost seed production
Data Source
AI summary
A new cultivar of Hydrangea macrophylla named ‘H2002’ that is characterized by its double sterile flowers with sepals that are light yellow-green to white with red margins, its free flowering and repeating blooming habit, its rounded mop-head type inflorescences, its young foliage that is tinged with greyed-red, and its lack of fertile flowers.