Intersectional Peony Cultivar With Strong Stems and Stable Sterility
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Solution Overview
Problem
Existing peony cultivars lack strong stems, large panicles, compact habits, and attractive flowers with unique foliage characteristics, and there is a need for sterile, triploid intersectional hybrids with improved disease resistance and adaptability.
Innovation Solution
Development of the Paeonia hybrid cultivar 'Smithopus4', which is a sterile, triploid intersectional hybrid with large lemon-yellow flowers, strong stems, and attractive dissected foliage, combining traits from herbaceous and tree peonies, offering compact growth and disease resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cross between herbaceous peony and tree peony is performed to create intersectional hybrid, then the plant gains strong stems and large flowers, but the plant becomes sterile with triploid ploidy level
Solution Approach 1:
The invention changes the ploidy level parameter by creating a triploid hybrid (3n) through crossing herbaceous peony (lactiflora) with tree peony, which results in sterile plants that cannot produce seeds. This parameter change resolves the contradiction by accepting sterility as a trade-off for achieving the desired strong stems and large flower characteristics.
2Stability of the object's composition
If the plant is made sterile through triploid hybridization, then the plant maintains stable and true-to-type characteristics, but the plant cannot reproduce sexually
Solution Approach 1:
By changing the ploidy parameter to triploid (3n), the invention achieves stable and true-to-type phenotypic characteristics across generations. The sterility resulting from this parameter change prevents genetic variation through sexual reproduction, thereby ensuring phenotype stability while eliminating reproductive capability.
3Productivity
If the plant produces large panicles with many flowers, then the plant becomes more floriferous and attractive, but the plant requires more energy and resources
Solution Approach 1:
The invention applies partial action by producing 1-2 lateral flowers per stem rather than many small flowers. This approach achieves adequate floriferousness and visual appeal while consuming fewer energy resources compared to producing large panicles with numerous flowers, thus resolving the contradiction between productivity and energy consumption.
4Strength
If the plant has semi-woody to woody stems like tree peony, then the plant gains strength and winter hardiness, but the plant loses compact habit and becomes less suitable for landscape use
Solution Approach 1:
The invention applies local quality by having stems that are semi-woody to woody in texture and strength (inheriting from tree peony parent) while maintaining an overall herbaceous growth habit and compact form. This localized application of woody characteristics provides the necessary stem strength without compromising the compact habit required for landscape suitability, thus resolving the contradiction between strength and adaptability.
Data Source
AI summary
A new and distinct cultivar of intersectional hybrid (Itoh) Paeonia plant named ‘Smithopus4’ is disclosed, characterized by large lemon-yellow flowers with slight red streaks which are semi-double to fully double form and carried on strong stems, which present the flowers above and beyond the foliage. Plants have dissected foliage, which lasts through the fall and is disease resistant. Plants have a symmetrical, compact plant habit/shape which is excellent in the landscape. The new variety is an intersectional hybrid (Itoh) Paeonia normally produced as an outdoor ornamental garden plant.