KN144-2 Interspecific Dogwood Hybrid Pigmentation Durability
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Solution Overview
Problem
Current dogwood tree cultivars, such as 'Rosea', 'Radiant Rose', and 'Heart Throb', exhibit less intense and shorter-lasting pink-red floral bract pigmentation, especially during extended hot weather, which limits their ornamental value and durability.
Innovation Solution
The development of the 'KN144-2' cultivar, a vigorous interspecific hybrid of Cornus kousa × C. nuttallii, which maintains intense pink-red bract pigmentation for an extended period through a series of backcrosses, resulting in improved growth habit, drought tolerance, winter hardiness, and resistance to pests and diseases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If current dogwood tree cultivars such as 'Rosea', 'Radiant Rose', and 'Heart Throb' are used, then they provide pink-red floral bracts, but the pigmentation intensity fades quickly and duration is short during extended hot weather
Solution Approach 1:
The patent applies parameter changes by developing a new cultivar 'KN144-2' through interspecific hybridization that fundamentally alters the pigmentation parameters. The new cultivar maintains intense pink-red coloration for significantly longer periods during hot weather compared to existing cultivars, changing the duration and intensity parameters of bract pigmentation through genetic modification rather than environmental control
Solution Approach 2:
The patent employs composite materials by creating an interspecific hybrid combining Cornus kousa and C. nuttallii 'Goldspot'. This hybridization produces a composite genetic structure that integrates desirable traits from both parent species, resulting in enhanced pigmentation durability and intensity that neither parent species possesses alone
2Reliability
If a series of backcrosses are performed to develop 'KN144-2', then intense and prolonged bract pigmentation is achieved, but the breeding program complexity and time required increase
Solution Approach 1:
The patent applies segmentation by breaking down the breeding program into distinct generational stages (F1 hybrid, Backcross 1, Backcross 2, Backcross 3). Each generation is evaluated and selected for specific traits, allowing systematic progression toward the desired pigmentation characteristics while managing complexity through structured segmentation of the breeding process
Solution Approach 2:
The patent employs preliminary action by conducting multiple backcrosses with selective breeding before final cultivar establishment. The F1 hybrid KN3-3 undergoes preliminary backcrossing with C. kousa 'Rosea' and subsequent generations are selectively bred, preparing the genetic material in advance to ensure the final cultivar 'KN144-2' possesses the desired intense and prolonged pigmentation traits
Data Source
AI summary
The physical manner in which the inflorescences on our new cultivar are displayed is unique as the flower heads are held erect on the rapidly elongating peduncles in the spring at nearly 90 degrees. When the telescoped vegetative bracts that protected the over-wintering flower buds have fallen, the rapidly growing peduncles elongate upward and the rapidly growing narrow pink-red floral bracts which are lightly attached at their apex enlarge upward until, with further growth, the floral bracts expand at an increased angle and look like butterflies perched on the vertical peduncles. The deep-cup shape of the floral bracts is unique among the comparative pink/red bracted clones of C. kousa ‘Rosea’, ‘Radiant Rose’, and ‘Heart Throb’ in the trade It's floral bracts are larger and darker than the C. kousa in the trade and holds its color longer than those of C. kousa which usually turn white. This hybrid ‘KN144-2’ is a winter hardy, attractive dark/pink red floral bracted tree with a beautiful round densely-branched growth habit than other C. kousa cultivars. It is more vigorous, dense, more rounded and fully branched, and is slightly taller than wide as compared to those presently in the trade. The bracts of this new cultivar are believed by the inventor to be larger and darker pink/red than those of any of the other pink/red cutivars of C. kousa.