Crapemyrtle DJ 05-14 Cultivar Breeding for Disease Resistance
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Solution Overview
Problem
Existing crapemyrtle varieties lack consistent deep purple foliage, adequate powdery mildew and Cercospera resistance, and desirable flower colors, which are essential for ornamental horticulture.
Innovation Solution
The development of the 'DJ 05-14' crapemyrtle cultivar, a Lagerstroemia indica x Lagerstroemia fauriei hybrid, exhibiting deep purple foliage, light lavender and white flowers, intermediate upright growth habit, and enhanced resistance to powdery mildew and Cercospera, achieved through selective breeding and asexual propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing crapemyrtle varieties are used, then they can be grown in ornamental horticulture, but they lack consistent deep purple foliage and adequate disease resistance
Solution Approach 1:
The patent applies parameter changes by selecting and breeding plants with specific genetic parameters that confer deep purple foliage color and resistance to powdery mildew and Cercospora diseases. The breeding process involves selecting parent plants with desirable traits and evaluating offspring for stable expression of these traits across generations, thereby changing the genetic parameters of the crapemyrtle variety to achieve both consistent foliage color and disease resistance.
2Ease of operation
If existing crapemyrtle varieties are used, then they can be cultivated, but they lack desirable flower colors and quality
Solution Approach 1:
The patent applies local quality by focusing on specific local traits of the crapemyrtle plant, particularly the flower color and foliage color. The breeder selected parent plants with specific local characteristics (light lavender flowers, deep purple foliage) and bred to concentrate these desirable local qualities in the offspring. The evaluation process specifically assessed these local traits to ensure they were expressed consistently in the new variety.
3Reliability
If 'Chocolate Mocha' crapemyrtle is used as parent plant, then it provides a base for breeding, but it lacks sufficient powdery mildew and Cercospera resistance
Solution Approach 1:
The patent applies preliminary action by first selecting parent plants with known desirable traits before initiating the breeding program. The 'Chocolate Mocha' crapemyrtle was chosen as a parent because it already possessed certain desirable characteristics. The breeder performed preliminary evaluation of parent plants and their offspring to identify those with the desired combination of traits, thereby streamlining the breeding process and reducing complexity by focusing resources on promising candidates.
Data Source
AI summary
A new crapemyrtle plant has deep, uniform purple foliage and stems; a light lavender to white flower color; an intermediate upright growth habit; and powdery mildew and Cercospera resistance.