Actinidia chinensis Y19 Kiwifruit Breeding for Shape and Shrivel Resistance
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Solution Overview
Problem
Current kiwifruit varieties face challenges such as low fruit length-to-width ratio, susceptibility to stylar end shrivel, and varying sweetness levels, which affect their horticultural performance and market appeal.
Innovation Solution
The new Actinidia chinensis variety 'Y19' is developed, characterized by a high fruit length-to-width ratio, exceptionally sweet taste with a tangy finish, and resistance to stylar end shrivel, achieved through selective breeding and grafting onto established rootstocks like 'Bruno' and 'Bounty 71', ensuring consistent propagation and improved horticultural traits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional kiwifruit varieties are grown, then they produce fruit, but the fruit length-to-width ratio is low
Solution Approach 1:
The patent applies parameter changes by selecting and breeding plants with specific genetic traits that naturally produce fruit with higher length-to-width ratios. The 'Y19' variety was selected from a population of seedlings based on its superior fruit shape parameters, and this trait is maintained through asexual propagation to ensure consistent high ratio fruit production while maintaining productivity.
Solution Approach 2:
The patent segments the breeding process into distinct phases: initial seedling population establishment, selection of superior individuals based on fruit shape, and asexual propagation to fix the trait. This segmentation allows for systematic improvement of the length-to-width ratio parameter while monitoring and maintaining overall fruit yield.
2Reliability
If conventional kiwifruit varieties are grown, then they produce fruit, but they are susceptible to stylar end shrivel
Solution Approach 1:
The patent applies preliminary action by selecting and propagating the 'Y19' variety that has pre-established resistance to stylar end shrivel before planting in commercial production. Through asexual propagation via grafting, the resistant trait is fixed and ensured in all subsequent plants, preventing the disease issue before it can affect yield rather than treating it after occurrence.
3Reliability
If conventional kiwifruit varieties are grown, then they produce fruit, but the sweetness level varies and is not exceptionally sweet
Solution Approach 1:
The patent applies parameter changes by selecting the 'Y19' variety based on its superior and consistent sweetness parameters (Brix levels). The variety was chosen from seedlings that demonstrated exceptionally sweet fruit, and asexual propagation ensures this sweetness parameter remains consistent across all plants and fruit production, providing reliable quality without sacrificing yield.
4Stability of the object's composition
If asexual propagation via grafting is used, then true-to-type reproduction is achieved, but the propagation process is time-consuming
Solution Approach 1:
The patent applies preliminary action by performing grafting during the dormant period (December) before the growing season begins. This timing allows the grafts to establish before active growth starts, reducing the overall propagation time while maintaining genetic consistency. The preliminary establishment of scions on rootstocks during dormancy enables earlier harvest readiness compared to other propagation methods.
Data Source
AI summary
The present disclosure relates to a new and distinct Actinidia chinensis plant named ‘Y19’, characterized by a twining habit of medium to strong vigor, exceptional sweet fruit with a slightly tangy finish, and resistance to stylar end shrivel in hot climates.