Polyploid Maize Breeding With Clonal Gametes for Uniform Seeds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current breeding methods struggle to produce uniform populations of polyploid maize seeds that leverage progressive heterosis, as traditional techniques fail to generate viable gametes and maintain genetic uniformity, and existing applications of MiMe technology are limited to diploid plants.
Innovation Solution
A novel breeding method using clonal gametes produced through MiMe technology to cross diverse maize lines, forming multiallelic polyploid seeds with three or more haplotypes, ensuring genetic uniformity and leveraging progressive heterosis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional breeding methods are used to produce polyploid maize seeds, then the process is simple and well-established, but the seeds lack genetic uniformity and cannot leverage progressive heterosis
Solution Approach 1:
The breeding process is divided into distinct phases: creating diverse diploid parents with specific haplotypes, inducing clonal gamete formation through MiMe technology, and crossing these gametes to produce uniform polyploid offspring. This segmentation allows precise control over genetic composition at each stage.
Solution Approach 2:
MiMe technology serves as an intermediary mechanism that bridges the gap between traditional breeding and the desired uniform polyploid population. It enables the conversion of diploid parents into clonal gametes, which then fuse to create genetically uniform tetraploid offspring with progressive heterosis.
2Adaptability or versatility
If MiMe technology is applied to diploid plants only, then the technology is currently feasible and validated, but it cannot produce polyploid seeds with multiple haplotypes
Solution Approach 1:
The MiMe technology platform is extended from its original diploid application to function universally across different ploidy levels. By designing the approach to work with diploid parents that can produce clonal gametes, the system achieves multi-functionality in generating uniform polyploid offspring with complex haplotype combinations.
Solution Approach 2:
The approach moves from a single-dimension (diploid) application to a multi-dimensional solution by incorporating polyploid outcomes. The clonal gametes produced from diploid parents are combined in ways that create tetraploid offspring with multiple haplotypes, adding a new dimension of genetic complexity while maintaining uniformity.
3Reliability
If diverse maize lines are crossed to leverage progressive heterosis, then agronomic traits improve, but the resulting population lacks genetic uniformity
Solution Approach 1:
Different regions of the genome are treated with different qualities: specific haplotypes are selected and maintained with high precision in the germplasm, while the overall population benefits from the diversity introduced by progressive heterosis. This allows uniformity in key agricultural traits while maintaining genetic diversity for continued improvement.
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.