Forward Breeding Method for Hybrid Backcrossing
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Solution Overview
Problem
Current crop breeding methods, such as advanced cycle breeding, face limitations in generating genetically diverse selection populations with high mean performance and genetic variability, particularly when using inbred parents, which can lead to reduced genetic diversity and limited recombination.
Innovation Solution
The method involves selecting a donor parent with a trait of interest and crossing it with hybrid parents, followed by recurrent backcrossing to introduce desired genes and alleles into genetically diverse selection populations, allowing for ongoing recombination and maintaining trait phenotypic values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inbred parents are used in advanced cycle breeding, then breeding efficiency is improved, but genetic diversity is reduced
Solution Approach 1:
The patent combines the advantages of both inbred and hybrid parents by using inbred parents for controlled crosses while incorporating hybrid parents in subsequent backcrossing operations. This merging approach maintains breeding efficiency through controlled inbred crosses while restoring genetic diversity through hybrid backcrossing, thereby resolving the contradiction between breeding efficiency and genetic diversity.
Solution Approach 2:
The patent implements a dynamic breeding scheme that transitions from static inbred parent usage to a more flexible approach incorporating multiple generations of backcrossing with hybrid parents. This dynamic adjustment allows the breeding program to adapt genetic diversity levels according to specific breeding goals, resolving the contradiction by making the system flexible rather than fixed.
2Speed
If self-fertilization is used at each generation, then inbred line development is accelerated, but recombination is limited
Solution Approach 1:
The patent implements periodic alternation between self-fertilization generations (for rapid inbreeding) and cross-fertilization generations (for recombination). This periodic switching allows the breeding program to achieve rapid inbreeding when needed while periodically introducing recombination through hybrid backcrossing, thereby resolving the contradiction between inbreeding speed and recombination capability.
3Adaptability or versatility
If recurrent crossing to hybrid parents is performed, then genetic diversity is maintained, but breeding complexity increases
Solution Approach 1:
The patent segments the breeding program into distinct phases: initial inbred parent crosses, followed by structured backcrossing generations, and final selection phases. This segmentation of the complex recurrent crossing process into manageable stages reduces overall program complexity while maintaining genetic diversity benefits, as each segment can be independently managed and optimized.
Data Source
AI summary
A method for plant breeding comprising the steps of: selecting a donor parent possessing a trait of interest; crossing the donor parent to a first hybrid parent; selecting a first generation progeny of the cross; and crossing the first generation progeny with a second hybrid parent to produce a hybrid back cross.