Spiraea Minspil04 Compact Habit and Seasonal Foliage Color
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Solution Overview
Problem
Current Spiraea japonica cultivars lack a compact plant habit and unique foliage color changes throughout the seasons, with many exhibiting green leaf reversion and less vigorous growth habits.
Innovation Solution
The development of the 'Minspil04' cultivar, which features a compact plant habit and unique foliage color changes from yellow-orange in spring to pink-red in fall without green reversion, achieved through asexual propagation by softwood stem cuttings, distinguishing it from other Spiraea cultivars like 'Goldflame' and 'Walbuma'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional Spiraea japonica cultivars are used, then they have vigorous growth habits, but they lack compact plant habit and exhibit green leaf reversion
Solution Approach 1:
The patent applies parameter changes by selecting and propagating a mutant plant with altered genetic parameters that prevent green reversion. The cultivar 'Minspil04' was derived from open pollination and selected for its stable yellow-orange foliage color without green reversion, representing a change in the genetic parameters controlling foliage color stability. Asexual propagation by softwood stem cuttings maintains these altered parameters true to type in successive generations.
2Ease of manufacture
If Spiraea cultivars with unique foliage color changes are developed, then seasonal color variation is improved, but plant habit becomes less vigorous
Solution Approach 1:
The patent applies local quality by focusing on specific foliar characteristics (yellow-orange spring foliage with orange flush, pink-red fall color) while maintaining overall plant vigor. The cultivar 'Minspil04' exhibits unique seasonal color changes in its foliage while preserving a moderately vigorous growth habit, demonstrating that localized improvement of foliage color properties does not necessarily compromise overall plant productivity.
3Stability of the object's composition
If asexual propagation is used to stabilize cultivar characteristics, then true-to-type reproduction is achieved, but the breeding process time is extended
Solution Approach 1:
The patent applies preliminary action by performing selection and characterization of the desired cultivar characteristics before large-scale propagation. The inventor selected a single unique plant amongst seedlings in July 2012, characterized its distinctive foliage color changes and compact habit, and then proceeded with asexual propagation. This preliminary selection and characterization phase ensures that subsequent propagation efforts focus on a pre-validated genotype, reducing overall breeding time despite the extended propagation process.
Data Source
AI summary
A new cultivar of Spiraea named ‘Minspil04’ that is characterized by compact plant habit, its unique foliage color changes throughout the seasons with leaves that are yellow with new growth flushed with orange in spring and changes to pink-red in fall, and its foliage that has no green reversion.