Hydrangea NCHA4 Cultivar Breeding for Compact Two-Toned Sepals
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Solution Overview
Problem
Current hydrangea cultivars lack a unique combination of large mop-head inflorescences with sterile flowers, two-toned sepals, and a compact form, along with distinct genome size and sepal color, which are not adequately represented in existing commercial varieties.
Innovation Solution
Development of the new hydrangea cultivar 'NCHA4' through a breeding program at North Carolina State University, resulting from a cross between Hydrangea arborescens H2008-143-001 and H2009-068-007, characterized by large mop-head inflorescences, two-toned sepals, a triploid cytotype, and compact form, with successful asexual propagation using indole butyric acid-treated stem cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing commercial hydrangea cultivars are used, then they have established horticultural characteristics, but they lack the unique combination of large mop-head inflorescences with sterile flowers, two-toned sepals, and compact form
Solution Approach 1:
The patent combines multiple desirable traits (large mop-head inflorescences with sterile flowers, two-toned sepals, and compact form) into a single new cultivar 'NCHA4' through controlled breeding, creating a unified plant that exhibits all these characteristics simultaneously rather than requiring separate cultivars for each trait
Solution Approach 2:
The patent achieves two-toned sepals with distinct coloration in different regions of the same structure (pink upper surfaces and deep pink lower surfaces), applying the local quality principle to create visual diversity within a single organ of the plant
2Reliability
If new hydrangea cultivar NCHA4 is developed through breeding program, then it exhibits unique combination of traits including large mop-head inflorescences, two-toned pink sepals, and compact form, but it requires successful asexual propagation to maintain characteristics
Solution Approach 1:
The patent applies indole butyric acid treatment to stem cuttings before planting to pre-condition the propag material for successful rooting, ensuring reliable establishment and maintenance of the new cultivar's characteristics through asexual propagation
Solution Approach 2:
The patent uses indole butyric acid as a chemical intermediary to facilitate the propagation process, enhancing root development in stem cuttings and ensuring reliable transmission of the cultivar's unique traits to subsequent generations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
NCHA4 exhibits a unique combination of traits including large mop-head inflorescences, two-toned pink sepals, and a compact form, distinguishing it from parent and commercial cultivars, while maintaining characteristics through successive asexual propagations, offering a distinct horticultural offering.
Implementation Method 1
rooting stem cuttings treated with a basal dip of 2,500-5,000 ppm indole butyric acid (potassium salt) in water
Data Source
AI summary
A new and distinct Hydrangea cultivar named ‘NCHA4’ is disclosed, characterized by large, mop-head inflorescences with prevalent sterile flowers. Plants produce distinctive two-toned sepals with pink upper surfaces and deep pink lower surfaces. Plant habit is compact, and plants are triploid. The new variety is a Hydrangea normally produced as an outdoor garden or container plant.