Pink Chief Apple Tree Columnar Bearing and Weak Vigor Mutation
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Solution Overview
Problem
There is a need for a distinct cultivar of apple tree that exhibits unique characteristics such as intense fruit color and columnar bearing, which are not adequately addressed by existing varieties like 'Cripps Pink' and 'PLFOG99', particularly in terms of vigor and fruit morphology.
Innovation Solution
The 'Pink Chief' cultivar, a spontaneous limb mutation of 'Cripps Pink', is distinguished by its intense pink-red fruit color and columnar bearing, with characteristics such as very weak to weak vigor, large fruit area, and thick fruit stalks, which are maintained through asexual reproduction and propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a spontaneous limb mutation of 'Cripps Pink' is selected for intense fruit color and columnar bearing, then fruit color intensity and tree shape are improved, but tree vigor becomes very weak to weak
Solution Approach 1:
The patent selects and propagates a spontaneous limb mutation that exhibits altered parameters compared to the parent 'Cripps Pink' variety. The mutation displays very weak to weak vigor, columnar bearing habit, and intense pink-red fruit color. These parameter changes are maintained through asexual reproduction by bud grafting, creating a stable cultivar with the desired columnar shape but reduced vigor.
2Shape
If a spontaneous limb mutation with intense fruit color is propagated, then fruit color intensity is improved, but fruit stalk thickness becomes thick which may affect handling
Solution Approach 1:
The spontaneous mutation exhibits altered fruit parameters including intense pink-red color and thick fruit stalks. The patent accepts these parameter changes as part of the unique cultivar characteristics, propagating the mutation through bud grafting to maintain consistency. The thick stalks and intense color are both results of the same genetic mutation that also produces columnar bearing and weak vigor.
3Adaptability or versatility
If a new cultivar with distinct characteristics is created through spontaneous mutation, then uniqueness and market differentiation are improved, but reliability of true-to-type reproduction must be maintained through careful propagation
Solution Approach 1:
The patent employs asexual reproduction through bud grafting to create exact copies of the spontaneous mutation. This copying method ensures that the unique characteristics (weak vigor, columnar bearing, intense pink-red color, thick stalks) are faithfully reproduced in subsequent generations. The grafting process maintains genetic fidelity, allowing the distinct cultivar characteristics to be reliably propagated while maintaining true-to-type reproduction.
Data Source
AI summary
A new and distinct apple tree (Malus domestica Borkh) named ‘Pink Chief’. The new variety is a spontaneous limb mutation of ‘Cripps Pink’ and is distinguished by its highly colored pink-red fruit, weaker vigor and columnar bearing.