Tetraploid Hemerocallis Cultivar SPd 06-12 Breeding
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Solution Overview
Problem
Current Hemerocallis cultivars lack early and continuous flowering on recurrent, branched scapes with high bud counts, and are not sufficiently cold and heat hardy, nor resistant to daylily rust, while also having issues with flower opening in cool conditions and shedding of spent flowers.
Innovation Solution
Development of a new tetraploid Hemerocallis cultivar 'SPd 06-12' with burgundy rose flowers, heavy petal substance, and grass-like foliage, exhibiting early and continuous reblooming, high bud counts, cold and heat hardiness, and resistance to daylily rust, achieved through selective breeding and stable propagation by division and tissue culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional Hemerocallis cultivars are used, then they can be grown in various climates, but they fail to exhibit early and continuous flowering on recurrent, branched scapes with high bud counts
Solution Approach 1:
The patent applies parameter changes by developing a tetraploid cultivar with altered ploidy level (4x) compared to conventional diploid cultivars. This genetic parameter change results in enhanced flowering performance including early season blooming, continuous reblooming on recurrent branched scapes, and high bud counts, while maintaining reliability across various growing climates.
Solution Approach 2:
The cultivar represents a composite genetic material resulting from controlled cross-breeding between selected parent plants. The composite genome combines desirable traits from multiple parents including early flowering, continuous reblooming capability, cold and heat hardiness, and rust resistance, achieving a synergistic effect that exceeds individual parent performance.
2Adaptability or versatility
If conventional Hemerocallis cultivars are used, then they can adapt to different climates, but they lack sufficient cold and heat hardiness
Solution Approach 1:
The tetraploid genetic composition (4x) represents a fundamental parameter change that enhances the plant's physiological tolerance to extreme temperatures. The cultivar demonstrates reliable performance in both cold and heat conditions across USDA zones 4-11, with the genetic parameter change providing increased hardiness while maintaining climate adaptability.
Solution Approach 2:
The breeding program performed preliminary selection and crossing of parent plants with desirable hardiness traits before developing the final cultivar. This preliminary action ensured that the resulting tetraploid cultivar inherited superior cold and heat hardiness characteristics, allowing it to reliably adapt to various climates from the outset.
3Ease of manufacture
If conventional Hemerocallis cultivars are used, then they can be propagated, but they exhibit slow multiplication rate
Solution Approach 1:
The tetraploid genetic parameter (4x) fundamentally changes the propagation characteristics of the cultivar. This parameter change enables both ease of propagation by division and high multiplication rate through tissue culture, allowing rapid production of true-to-type plants while maintaining genetic stability across generations.
Solution Approach 2:
The cultivar exhibits excellent copying fidelity through both division and tissue culture propagation methods. The tetraploid genetic composition ensures that all propagated plants are true to type, accurately copying the parent plant's characteristics including flowering performance, hardiness, and foliage traits, thereby enabling rapid multiplication while maintaining consistency.
4Quantity of substance
If conventional Hemerocallis cultivars are used, then they can produce flowers, but the flowers do not fully open during cool conditions
Solution Approach 1:
The tetraploid genetic parameter change (4x) fundamentally alters flower development and opening characteristics. The cultivar produces abundant flowers that consistently open fully even during cool growing conditions, demonstrating improved manufacturing precision in flower development while maintaining high flower production quantity throughout the blooming season.
5Productivity
If conventional Hemerocallis cultivars are used, then they can complete their life cycle, but they lack resistance to daylily rust
Solution Approach 1:
The tetraploid genetic composition represents a parameter change that confers resistance to daylily rust (Puccinia hemerocallidis). The cultivar maintains high productivity and flowering performance while exhibiting resistance to rust infection, eliminating the harmful effect of rust susceptibility present in conventional cultivars.
Solution Approach 2:
The breeding program converted the potential harm of rust susceptibility into a benefit by selecting parent plants with rust resistance traits and combining them in the tetraploid cultivar. The resulting plant exhibits resistance to daylily rust, transforming what was previously a harmful vulnerability into a protective characteristic that enhances overall plant health and productivity.
6Duration of action of moving object
If conventional Hemerocallis cultivars are used, then they can bloom, but they commence blooming later in the season with less recurrent blooming
Solution Approach 1:
The tetraploid genetic parameter change fundamentally alters the blooming phenology of the cultivar. It commences blooming very early in the season and continues with recurrent blooming on branched scapes until frost, achieving both early onset (high speed) and extended duration, unlike conventional cultivars that bloom later with less recurrence.
Solution Approach 2:
The cultivar exhibits continuous useful action through recurrent blooming on branched scapes. After the initial early season bloom, the plant continues to produce flowers repeatedly throughout the growing season, maintaining continuous flowering activity until frost, thereby extending the effective blooming period while starting early in the season.
Data Source
AI summary
A new cultivar of Hemerocallis named ‘SPd 06-12’, characterized by its flowers that are burgundy rose in color with darker burgundy eyezones with yellow-green throats, its flowers that fully open under cool growing conditions and are self cleaning, its flower petals that are broadly elliptic in shape and heavy in substance with lightly ruffled edges, its blooming habit that commences very early in the season with continuous rebloom until frost on recurrent, branched scapes with high bud counts, its foliage that is evergreen, semi-evergreen or dormant depending on the growing climate with suitability in a variety of growing climates, its compact plant habit with grass-like foliage, its fast multiplication rate, and its hardiness at least in U.S.D.A. Zones 4 to 11, and its high tolerance to daylily rust.