Physocarpus N5 Cultivar Compact Habit and Mildew Resistance
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Solution Overview
Problem
Current Physocarpus opulifolius cultivars lack a compact plant habit with dark purple-black foliage and sufficient resistance to powdery mildew, making them less desirable for landscape use.
Innovation Solution
The development of the 'N5' cultivar, which exhibits a compact plant habit, very dark purple-black foliage, and high resistance to powdery mildew, achieved through asexual propagation by softwood stem cuttings, distinguishing it from other cultivars like 'Monlo', 'SMPOTW', and 'Minall2'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing Physocarpus opulifolius cultivars are used, then they have established foliage color characteristics, but they lack compact plant habit and sufficient powdery mildew resistance
Solution Approach 1:
The patent applies parameter changes by selecting and propagating a plant variant with specific genetic parameters that differ from the parent cultivar. The softwood stem cutting propagation method preserves and replicates the unique combination of compact growth habit and disease resistance parameters, creating a stable cultivar with improved reliability against powdery mildew while maintaining the desired compact shape.
2Reliability
If existing Physocarpus opulifolius cultivars are used, then they have established foliage color characteristics, but they lack sufficient compactness and disease resistance
Solution Approach 1:
The invention changes the genetic parameters of the plant through selective propagation. By using softwood stem cuttings from a selected seedling, the patent creates a cultivar with modified parameters including enhanced disease resistance and altered growth architecture, achieving simpler effective structure through compact habit while improving reliability.
3Shape
If the parent cultivar 'Monlo' is used, then it has purple foliage, but the foliage color is lighter and plant habit is less compact
Solution Approach 1:
The patent applies parameter changes by selecting a seedling with superior genetic parameters for compactness and foliage color intensity. The softwood stem cutting propagation method ensures these parameter changes are stably inherited, producing a cultivar with darker purple-black foliage and more compact habit compared to the parent 'Monlo' cultivar.
4Reliability
If existing cultivars like 'SMPOTW' or 'Minall2' are used, then they have dark foliage color, but they lack the combination of compact habit and high powdery mildew resistance
Solution Approach 1:
The invention achieves parameter changes by propagating a selected seedling that combines multiple desirable traits. The softwood stem cutting method preserves the unique genetic combination of compact growth habit and high disease resistance, creating a cultivar that surpasses existing dark-foliaged cultivars in terms of powdery mildew resistance while maintaining compact form.
Data Source
AI summary
A new cultivar of Physocarpus opulifolius plant named, ‘N5’, that is characterized by its compact plant habit, its foliage that is very dark purple-black in color, and its high resistance to powdery mildew.