Hosta Royal Crest Tetraploid Mutation for Fragrant White Flowers
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Solution Overview
Problem
The existing hosta cultivars lack a combination of distinct traits such as medium rounded-mound plant habit, dense foliage, heavy-substance, stiff leaves, and strongly fragrant white flowers, which are not found in other cultivars like 'Braveheart', 'Old Faithful', 'Fried Green Tomatoes', and 'Royal Standard'.
Innovation Solution
Hosta 'Royal Crest' is a hybrid cultivar resulting from a cross between a proprietary tetraploid mutation of 'Royal Standard' and 'Braveheart', characterized by medium rounded-mound plant habit, dense foliage with deep green, shiny leaves, and large, strongly fragrant white flowers on stiff upwardly projecting scapes, propagated through division and tissue culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hosta cultivar has variegated foliage, then visual appeal is improved, but leaf substance thickness and stiffness deteriorate
Solution Approach 1:
The patent applies parameter changes by creating a tetraploid mutation of 'Royal Standard' to achieve variegated foliage while maintaining thick, stiff leaves. The tetraploidization process altered the genetic parameters of the plant, allowing expression of variegation without the typical compromise in leaf substance quality that occurs in conventional variegated cultivars.
2Stability of the object's composition
If a hosta cultivar has arching leaves, then plant flexibility is improved, but leaf stiffness and substance deteriorate
Solution Approach 1:
The patent applies asymmetry by creating leaves with upright, rigid posture rather than arching forms. The 'Royal Crest' cultivar exhibits asymmetric growth patterns where leaves maintain a stiff, erect orientation, contrasting with the symmetric arching habit of other cultivars. This asymmetric leaf posture preserves leaf stiffness while creating a distinct structural character.
3Quantity of substance
If a hosta cultivar produces pale lavender flowers, then flower quantity is improved, but fragrance intensity and flower color distinctiveness deteriorate
Solution Approach 1:
The patent applies parameter changes by producing pure white flowers through the tetraploid mutation, representing a significant deviation from the typical lavender coloring in hostas. This color parameter change is accompanied by enhanced fragrance intensity, demonstrating that the genetic modification simultaneously altered both visual and olfactory characteristics in favorable directions.
4Volume of stationary object
If a hosta cultivar has a large clump size, then plant vigor is improved, but foliage density and mound compactness deteriorate
Solution Approach 1:
The patent applies spheroidality by developing a compact, rounded mound habit with tight foliage arrangement. The 'Royal Crest' cultivar forms a dense, spherical clump structure where leaves are tightly packed and oriented to create a compact dome shape, rather than spreading out in a loose, open configuration. This spherical habit maintains both vigor and density.
Data Source
AI summary
A new and distinct Hosta plant named ‘Royal Crest’ with medium rounded-mound habit of heavy-substance, cordate foliage having slightly wavy margins, acute apex and cordate base with deep green color. The plant has large, white, strongly-fragrant, broadly-faced flowers densely arranged on stiff upright scapes above the foliage beginning in early August.