Dasiphora Jefmarm Cultivar Double Flower Color Stability
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Solution Overview
Problem
There is a need for a new cultivar of Dasiphora fruticosa subsp. fruiticosa that exhibits unique and stable characteristics, such as double flowers with a distinct coloration and extended blooming period, which are not present in existing cultivars like 'Uman' and 'Marrob', and offers improved hardiness and disease resistance.
Innovation Solution
The development of the 'Jefmarm' cultivar, resulting from a cross between 'Uman' and 'Marrob', which features double yellow flowers with an orange-red tinge that fade to dark yellow in hot weather, an extended blooming period, and demonstrates stability through asexual propagation by softwood cuttings, ensuring consistent traits across generations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cross between 'Uman' and 'Marrob' is made to create new cultivar characteristics, then unique double flowers with distinct coloration and extended blooming period are achieved, but stability of traits across generations must be verified through propagation
Solution Approach 1:
Asexual propagation by softwood cuttings was performed in advance to verify trait stability before the cultivar was considered fully developed. This preliminary propagation action confirmed that the unique double flowers with orange-red tinge and extended blooming period would be reliably reproduced in successive generations.
2Reliability
If 'Jefmarm' is compared to parent cultivars 'Uman' and 'Marrob', then improved flower quality and hardiness are achieved, but the complexity of breeding program increases
Solution Approach 1:
The successful cultivar 'Jefmarm' serves as a template or model for future breeding programs. By documenting its specific characteristics (double flowers, orange-red tinge, hardiness in zones 2-6), it provides a proven blueprint that simplifies subsequent breeding efforts rather than requiring repeated complex experimentation.
3Duration of action of moving object
If 'Jefmarm' is compared to cultivar 'Jefman' for landscape use, then extended blooming period and unique coloration are achieved, but flower structure complexity increases
Solution Approach 1:
The cultivar 'Jefmarm' exhibits parameter changes in flower structure (double flowers with multiple petals) and coloration (orange-red tinge) compared to single-flowered cultivars like 'Jefman'. These parameter changes result in extended blooming period and unique ornamental characteristics suitable for landscape use.
Data Source
AI summary
A new cultivar of Dasiphora, ‘Jefmarm’, that is characterized by its double flowers that are yellow with a distinct orange-red tinge, its flowers that fade in hot weather to a dark yellow color, and its extended blooming period.