Maize Haploid Induction Gene and Marker-Assisted Breeding
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Solution Overview
Problem
Current methods for establishing homozygous lines in maize breeding are time-consuming, and existing inducer lines for haploid induction in maize have limitations such as poor pollen efficiency, requiring lengthy and costly processes for breeding and seed multiplication, with a need for improved molecular markers for haploid induction.
Innovation Solution
Identification of a gene homologous to the acyl transferase/acyl hydrolase/lysophospholipase family responsible for haploid induction in maize, along with associated molecular markers, which enables the development of polynucleotides and recombinant DNA constructs to enhance haploid induction efficiency and streamline breeding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional methods are used to establish homozygous lines, then genetic stability is achieved, but the time required is excessively long (8-10 generations)
Solution Approach 1:
The patent applies preliminary action by inducing haploids at an early stage (F1 generation) through crossing with inducer lines, rather than waiting for traditional multi-generation selfing. This allows homozygous lines to be obtained in just 2-3 generations by doubling chromosomes in the haploid stage, dramatically reducing the time from 8-10 generations to 2-3 generations while maintaining genetic stability
2Productivity
If existing inducer lines are used for haploid induction, then haploid production is achieved, but pollen efficiency is poor and processes are lengthy and costly
Solution Approach 1:
The patent applies parameter changes by modifying the inducer line genetics through marker-assisted selection. Specific molecular markers (umc1917, bnlg1811, and others) are used to identify and select lines with enhanced haploid induction ability, changing the genetic parameters of the inducer lines to improve pollen efficiency and reduce the complexity of breeding processes
Solution Approach 2:
The patent replaces mechanical/phenotypic selection methods with molecular marker-based selection. Instead of relying on time-consuming phenotypic evaluation of haploid induction ability, the invention uses DNA markers to directly identify lines with the desired trait, substituting a faster, more precise molecular detection system for traditional mechanical selection processes
3Measurement precision
If molecular markers are used for allele identification, then selection precision is improved, but the complexity of the process increases
Solution Approach 1:
The patent applies universality by developing a standardized molecular marker system that can be applied across multiple inducer line development projects. The markers (umc1917, bnlg1811, and others) serve multiple functions: identifying haploid induction ability, tracking allele inheritance, and selecting superior lines, thereby reducing overall process complexity despite the added precision
Data Source
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AI summary
The present invention concerns an isolated polynucleotide responsible of haploid induction in maize plants and related processes. Additionally, the invention relates to plants that have been genetically transformed with the polynucleotide of the invention. The invention also relates to a process for screening a mutant plant population for enhanced haploid induction by using said isolated polynucleotide. The invention further relates to molecular markers associated with haploid induction in maize plants and their use in quality control for inducer lines.