Polyploid Maize Breeding Using MiMe Clonal Gametes
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Solution Overview
Problem
Current breeding methods for polyploid maize are inefficient and unable to produce uniform populations of polyploid maize seeds that harness progressive heterosis, due to challenges in generating viable gametes and maintaining genetic uniformity.
Innovation Solution
A breeding method utilizing clonal gametes produced through MiMe technology, where diverse maize lines are selected and crossed to create genetically uniform polyploid maize seeds with multiple haplotypes, leveraging MiMe gene modifications to control meiotic processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional breeding methods are used for polyploid maize, then breeding complexity is reduced, but breeding efficiency and ability to produce uniform polyploid seeds is poor
Solution Approach 1:
The patent replaces traditional mechanical/meiotic breeding processes with a chemical/genetic approach using MiMe technology. By introducing specific gene modifications (MiMe genes) that alter meiotic behavior, the invention enables controlled production of clonal gametes, substituting the natural mechanical process of meiosis with a genetically controlled process that produces uniform polyploid seeds efficiently.
Solution Approach 2:
The patent changes the genetic parameters of the maize plants by introducing MiMe gene modifications. These parameter changes in the genome allow the plants to produce clonal gametes instead of conventional meiotic gametes, thereby enabling efficient production of uniform polyploid seeds while maintaining breeding complexity at manageable levels through controlled genetic modification.
2Manufacturing precision
If clonal gametes are produced through MiMe technology, then genetic uniformity of polyploid seeds is improved, but control over meiotic processes becomes more complex
Solution Approach 1:
The patent extracts and isolates the critical control function from the complex meiotic process by introducing specific MiMe genes that independently regulate gamete formation. This extraction allows precise control over genetic uniformity through targeted gene action, separating the control mechanism from the complex natural meiotic process and simplifying the overall control system.
Solution Approach 2:
The MiMe genes act as intermediary elements between the genome and the gamete formation process. These intermediary genetic modifiers mediate the interaction between parental genomes and the resulting polyploid seeds, enabling precise control over genetic uniformity while managing the complexity of meiotic process control through a defined genetic interface.
3Adaptability or versatility
If diverse maize lines are crossed to create multiple haplotypes, then progressive heterosis is enhanced, but difficulty in generating viable gametes increases
Solution Approach 1:
The patent applies preliminary action by pre-modifying the genomes of diverse maize lines with MiMe genes before crossing. This preliminary genetic preparation ensures that all parent lines are equipped with the necessary genetic tools to produce viable clonal gametes, thereby maintaining high gamete viability while enabling the crossing of diverse lines to harness progressive heterosis through multiple haplotypes.
Solution Approach 2:
The MiMe gene modification provides a universal solution that works across diverse maize lines. By introducing this universal genetic modifier, the patent enables all parent lines regardless of their specific genetics to produce viable clonal gametes, thereby maintaining high reliability in gamete formation while allowing the exploitation of progressive heterosis through the combination of multiple haplotypes from diverse lines.
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
This method enables the production of genetically uniform polyploid maize seeds with multiple haplotypes, allowing for the practical application of progressive heterosis and overcoming inefficiencies in traditional breeding techniques.
Implementation Method 1
Prior research has established methods that allow plant geneticists to arrest meiosis in plants and replace it with a mitosis-like division in germline cells, resulting in formation of clonal gametes that contain the complete nonrecombinant genome of the parent.
Data Source
AI summary
The present inventions relate to a breeding system for the production of polyploid maize seeds, maize plants, or maize plant parts where cycles of meiosis, syngamy, and selection are used for interpopulation improvement of progenitor lines, and sexual polyploidization occurs during hybrid production by inducing clonal gamete formation in the parents that are to be crossed. Reciprocal recurrent selection can be used to inform selection of candidate maize lines that are either advanced to a gene editing or genetic modification system or crossed and selected to induce clonal gamete formation by arresting meiotic recombination and chromosome reduction. Crosses of parent maize plants bearing clonal gametes are planned and executed based upon predicted heterotic performance at the polyploid level. The final product is a homogeneous population of hybrid polyploid maize seed, or derivative thereof, bearing both parents' complete nuclear genomes.