Hydrangea Perfection Double Sterile Pink Flower Breeding
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Solution Overview
Problem
There is a need for new cultivars of Hydrangea macrophylla with unique flower colors and double flowers that can consistently reproduce true to type, as existing cultivars lack distinctiveness in flower color and form.
Innovation Solution
The development of the 'PERFECTION' cultivar, a bigleaf hydrangea with double sterile pink flowers, free flowering and repeating blooming habit, and mop-head type inflorescences, achieved through controlled breeding between Hydrangea macrophylla 'Yamaajisai' as the male parent and an unnamed Hydrangea macrophylla as the female parent, using asexual reproduction by softwood stem cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If controlled breeding is used to develop new Hydrangea cultivars with unique flower colors and double flowers, then flower color distinctiveness and flower form are improved, but breeding time and complexity increase
Solution Approach 1:
The inventor performed preliminary breeding actions by crossing Hydrangea macrophylla 'Yamaajisai' with an unnamed Hydrangea macrophylla plant in June 1996, and selected the unique single plant in 2000, establishing the foundation for the 'PERFECTION' cultivar with double sterile pink flowers before formal patent application
Solution Approach 2:
The cultivar characteristics were copied and reproduced through asexual reproduction by softwood stem cuttings, allowing the unique double flower form and pink coloration to be consistently replicated true to type in successive generations without additional breeding time
2Stability of the object's composition
If asexual reproduction by softwood stem cuttings is used, then true-to-type reproduction is improved, but propagation time and root development period increase
Solution Approach 1:
The patent employs softwood stem cuttings to create genetic copies of the parent plant, ensuring that the unique double sterile pink flower characteristics are reproduced true to type in all propagated plants, maintaining compositional stability across generations
Solution Approach 2:
The patent specifies optimal propagation parameters including taking cuttings during specific seasons and maintaining root development at an average temperature of 18°C (night)/20°C (day), which optimizes the propagation time while ensuring true-to-type reproduction
3Stability of the object's composition
If double sterile flowers are developed, then flower color uniformity and flower form consistency are improved, but reproductive capability is lost
Solution Approach 1:
The patent extracts the reproductive function from the flower by developing double sterile flowers that cannot open or fertilize, while retaining and enhancing the ornamental characteristics of pink coloration and double flower form for landscape use
Solution Approach 2:
Since the flowers are sterile and cannot reproduce sexually, the patent uses asexual reproduction through softwood stem cuttings to copy and propagate the unique double sterile pink flower characteristics, ensuring consistency without relying on seed production
4Duration of action of moving object
If free flowering and repeating blooming habit are achieved, then ornamental value and blooming duration are improved, but energy consumption and plant stress increase
Solution Approach 1:
The 'PERFECTION' cultivar exhibits free flowering and repeating blooming habit from early May through early October, maintaining continuous ornamental value throughout the growing season without interruption, maximizing the duration of useful action
Data Source
AI summary
A new cultivar of Hydrangea macrophylla named ‘PERFECTION’ that is characterized by its free-flowering and reblooming habit, and its well-developed mop-head type inflorescences comprised of double sterile flowers that are dark pink in color.