Coreopsis URIGS01 Gamma Irradiation Mutation Breeding
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Solution Overview
Problem
There is a need for a new cultivar of Coreopsis with orange-colored inflorescences that combines unique characteristics such as compact growth, dark orange-yellow ray florets with yellow margins, and resistance to diseases like powdery mildew and leaf spot, which are not adequately met by existing Coreopsis cultivars.
Innovation Solution
The development of an interspecific hybrid cultivar 'URIGS01' between Coreopsis grandiflora and Coreopsis verticillata, achieved through gamma irradiation of un-rooted cuttings of 'Crème Brulee', resulting in a compact, densely branched plant with dark orange-yellow inflorescences and enhanced disease resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing Coreopsis cultivars are used, then they provide basic ornamental value, but they lack the specific combination of compact growth habit, dark orange-yellow inflorescences with yellow margins, and enhanced disease resistance
Solution Approach 1:
The invention applies gamma irradiation to induce genetic mutations in Coreopsis 'Crème Brulee' cuttings, thereby changing the genetic parameters to produce novel traits including compact growth habit, dark orange-yellow inflorescences with yellow margins, and enhanced disease resistance. This parameter change through mutation breeding resolves the contradiction by creating a new cultivar with the desired combination of traits without requiring complex multi-parental breeding programs.
Solution Approach 2:
The invention uses an interspecific hybridization approach between Coreopsis grandiflora and Coreopsis verticillata as an intermediary strategy to combine desirable traits from both parent species. This intermediary breeding approach allows the transfer of specific genes controlling compact growth, inflorescence coloration, and disease resistance, thereby achieving the desired trait combination while managing breeding complexity through controlled hybridization.
2Reliability
If gamma irradiation is applied to induce mutations, then new traits such as compact growth and disease resistance are achieved, but the breeding process becomes more complex and time-consuming
Solution Approach 1:
Gamma irradiation is applied to induce controlled genetic mutations in the Coreopsis cuttings, changing the genetic parameters to enhance disease resistance and produce compact growth habit. This physical mutation method provides a direct approach to improving reliability against diseases and pests without requiring complex multi-generational selective breeding programs, thereby resolving the contradiction between achieving reliable disease resistance and maintaining breeding process simplicity.
3Shape
If the parent plant 'Crème Brulee' is used, then it provides yellow inflorescences, but the inflorescences are larger and lighter in color without yellow margins
Solution Approach 1:
Gamma irradiation induces mutations that change the coloration parameters of the inflorescences, transforming the parent plant's light yellow color to dark orange-yellow with distinct yellow margins. The mutation also reduces inflorescence size while maintaining compact plant architecture. These parameter changes are stabilized through asexual propagation, resolving the contradiction between achieving novel coloration and maintaining trait consistency across generations.
Solution Approach 2:
The invention uses asexual propagation by stem cuttings to create exact genetic copies of the mutated plant, ensuring that the novel inflorescence coloration traits (dark orange-yellow with yellow margins) and compact growth habit are reproduced true to type in successive generations. This copying approach maintains trait consistency while preserving the novel coloration characteristics that differ from the parent plant.
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 cultivar 'URIGS01' exhibits stable and true-to-type characteristics, including compact growth, dark orange-yellow inflorescences, and high resistance to powdery mildew and leaf spot, making it a distinct and desirable option for landscape and container use.
Implementation Method 1
The new cultivar arose from gamma irradiation of un-rooted cuttings of Coreopsis 'Crème Brulee' (U.S. Plant Pat. No. 16,096) in 2011.
Data Source
AI summary
A new cultivar of hybrid Coreopsis plant named, ‘URIGS01’, that is characterized by its inflorescences with ray florets that are dark orange-yellow in color with yellow margins, its relatively small leaves, its relatively small inflorescences, and its compact, densely branched plant habit.