Spiraea Yan Cultivar Compact Growth and Mildew Resistance
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Solution Overview
Problem
Existing Spiraea japonica cultivars lack compact growth, large flowers, and effective resistance to Powdery Mildew, which limits their garden performance and adaptability.
Innovation Solution
A new Spiraea cultivar 'Yan' is developed through planned breeding, exhibiting a compact, upright growth habit, vigorous branching, yellow-green leaves, numerous pink flowers, and enhanced resistance to Powdery Mildew, achieved through asexual reproduction by softwood cuttings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing Spiraea japonica cultivars are used, then they provide basic ornamental value, but they lack compact growth and effective resistance to Powdery Mildew
Solution Approach 1:
The patent applies parameter changes by selecting and breeding for specific phenotypic parameters including compact plant height (4-6 inches), specific leaf color characteristics (yellow-green to golden), flower color (pink to rose), and resistance to Powdery Mildew. These parameter changes result in a cultivar that simultaneously achieves compact growth and disease resistance, resolving the contradiction between reliability and adaptability.
2Length of stationary object
If Spiraea cultivars are bred for compactness, then plant size is reduced, but flower size and branching may be compromised
Solution Approach 1:
The patent applies local quality by developing a cultivar with differentiated growth characteristics: the overall plant structure is compact (4-6 inches height), while specific local areas exhibit vigorous branching and large flower production. The branching habit is concentrated in the upper portions of the plant, allowing compact overall size while maintaining local vibrancy and flowering capacity.
3Stability of the object's composition
If asexual reproduction by softwood cuttings is used, then genetic stability is maintained, but propagation time is extended
Solution Approach 1:
The patent applies copying by using softwood cuttings to produce genetically identical copies of the selected parent plant. This asexual reproduction method preserves the stable genotype and true-to-type phenotypic characteristics of the cultivar, ensuring that propagated plants are genetically stable copies that faithfully reproduce the desired traits.
4Reliability
If leaf color is made yellow-green instead of golden, then disease resistance is improved, but aesthetic appeal may be reduced
Solution Approach 1:
The patent applies parameter changes by selecting for a specific leaf color parameter that balances disease resistance and aesthetic quality. The yellow-green to golden leaf coloration provides the necessary resistance to Powdery Mildew while maintaining sufficient visual appeal for ornamental use, achieving an optimal balance between functional reliability and aesthetic ease of manufacture.
Data Source
AI summary
A new and distinct cultivar of Spiraea plant named ‘Yan’, characterized by its compact, upright, outwardly spreading and mounding plant habit; vigorous growth habit; freely branching habit; leaves that are yellow green in color; numerous pink-colored flowers; good garden performance; and resistance to Powdery Mildew.