Heuchera Blackout Cultivar Dark Foliage Stability
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Solution Overview
Problem
There is a need for a new Heuchera cultivar with darker, glossier foliage and a more vigorous growth habit compared to existing dark-foliaged varieties, while maintaining cold hardiness and stability through asexual reproduction methods.
Innovation Solution
The development of the 'Blackout' Heuchera cultivar, characterized by dark black-brown glossy leaves, compact mounded habit, and cold hardiness in USDA Zones 4 to 9, achieved through in vitro propagation and tissue culture, distinguishing it from its parent 'Prince' and similar cultivars like 'Obsidian' and 'Black Beauty'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If in vitro propagation and tissue culture methods are used, then stable and consistent dark foliage traits are achieved across generations, but the complexity of the propagation process increases
Solution Approach 1:
The patent applies preliminary action by establishing the cultivar through in vitro propagation and tissue culture methods before commercial distribution. This preliminary establishment ensures that the dark foliage traits are stabilized and can be consistently reproduced across all subsequent generations through these controlled propagation methods, rather than relying on traditional seed propagation which would result in genetic variation.
2Stability of the object's composition
If darker foliage is selected for, then visual distinction from other cultivars is improved, but the growth vigor may be reduced
Solution Approach 1:
The patent applies parameter changes by selecting and propagating a mutation that exhibits extreme darkness in foliage color (described as 'dark black-brown' and 'darker than those of any Heuchera cultivar known'). This represents a significant change in the color parameter while the tissue culture propagation maintains the associated growth vigor parameters, breaking the typical trade-off between extreme coloration and growth performance.
Solution Approach 2:
The patent uses tissue culture to create exact copies of the mutant plant that exhibits both the extreme dark foliage color and the vigorous growth habit. By propagating through tissue culture rather than seed, the patent copies the complete phenotype including both the distinctive dark coloration and the superior growth vigor, ensuring these traits are inherited together consistently.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The 'Blackout' cultivar exhibits unique and stable dark foliage, a more vigorous growth habit, and improved cold hardiness, making it distinct from other Heuchera cultivars, with successful asexual reproduction methods ensuring consistent traits across generations.
Implementation Method 1
Asexual reproduction of the new cultivar was first accomplished under direction of the inventor by in vitro propagation in Rijswijk, The Netherlands in March of 2007. Asexual reproduction of the new cultivar by division and tissue culture has shown that the unique features are stable and reproduced true to type in successive generations.
Data Source
AI summary
A new cultivar of hybrid Heuchera named ‘Blackout’, characterized by its glossy, dark black-brown colored foliage held nearly flat on dark purple petioles, its compact and mounded plant habit, its vigor, and its hardiness in at least U.S.D.A Zones 4 to 9.