Astelia Silver Shadow Hybrid Cultivar Breeding
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Solution Overview
Problem
There is a need for a new and distinct cultivar of Astelia that combines desirable traits such as small, silver-leafed foliage and a compact growth habit, which are not adequately met by existing cultivars like Astelia chathamica and Astelia nervosa, particularly in terms of leaf color distribution and plant size.
Innovation Solution
The development of an interspecific hybrid cultivar 'Silver Shadow' (Astelia chathamica × Astelia nervosa) with small, silver-leafed foliage and a dwarf, broad-mounded habit, characterized by a silver overlay on both upper and lower leaf surfaces, and moderate growth rate, achieved through asexual reproduction by division and tissue culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If Astelia chathamica is used as parent plant, then silver overlay on lower surface is achieved, but leaf size becomes large and plant size becomes large
Solution Approach 1:
The hybrid cultivar 'Silver Shadow' exhibits local quality by displaying silver overlay on both upper and lower leaf surfaces, whereas the parent Astelia chathamica only shows silver overlay on the lower surface. This enhanced local distribution of silver coloring is achieved through hybridization, creating a new quality pattern that combines traits from both parents while exceeding the parent's characteristics.
2Length of stationary object
If Astelia nervosa is used as parent plant, then small leaf size is achieved, but silver overlay is only on upper surface
Solution Approach 1:
The hybrid cultivar 'Silver Shadow' merges the desirable traits of both parent plants: it combines the small leaf size characteristic of Astelia nervosa with the silver overlay trait, but enhances it by displaying silver coloring on both upper and lower surfaces, thus merging and improving upon the parental characteristics.
3Ease of manufacture
If hybridization between Astelia chathamica and Astelia nervosa is performed, then silver overlay on both surfaces and small leaf size are achieved, but plant size becomes dwarf
Solution Approach 1:
The hybridization process induces parameter changes in plant size, resulting in a dwarf habit that is smaller than both parent plants. This parameter change is an unintended consequence of the hybridization that achieves the desired silver overlay on both surfaces and small leaf size, representing a trade-off in the breeding process.
4Reliability
If upright plant habit is desired, then frost resistance is improved, but silver overlay distribution becomes less optimal
Solution Approach 1:
Instead of adopting the upright habit of frost-resistant cultivars like 'Silver Spear', the invention inverts the approach by selecting for a dwarf, spreading habit with silver overlay on both surfaces. This inverted selection priority achieves superior aesthetic qualities with adequate hardiness, reversing the traditional priority of frost resistance over foliage quality.
Data Source
AI summary
A new cultivar of Astelia named ‘Silver Shadow’ that is characterized by its foliage that is green in color with a silver overlay on the upper and lower leaf surface, its small leaves, and its dwarf, broad, and mounded plant habit.