Hybrid Corn CH011104 Breeding Using CMS and Tissue Culture
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Solution Overview
Problem
Current corn breeding techniques face challenges in developing hybrid varieties that combine desirable traits such as high yield, disease resistance, and uniformity, while maintaining genetic stability and avoiding self-pollination, which limits the introduction of new genetic modifications and traits.
Innovation Solution
The development of the hybrid corn variety CH011104, which incorporates genetic modifications for traits like male sterility, herbicide resistance, and disease resistance, using cytoplasmic or nuclear factors and genetic loci, along with tissue culture techniques to regenerate plants with specific physiological and morphological characteristics, and a method for crossing parent plants to produce hybrid seeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional self-pollination breeding methods are used, then genetic stability is maintained, but the ability to introduce new genetic modifications and traits is limited
Solution Approach 1:
The patent segments the breeding process into distinct phases: using self-pollination for maintaining genetic stability in established lines, and introducing controlled cross-pollination with genetically modified parent plants for incorporating new traits. This segmentation allows both genetic stability and adaptability to coexist in different stages of the breeding program.
Solution Approach 2:
The patent changes the genetic composition parameter by introducing parent plants with specific genetic modifications (such as male sterility genes, herbicide resistance genes) into the breeding program. This parameter change enables the introduction of new traits while maintaining overall genetic stability through controlled crossing and selection processes.
2Adaptability or versatility
If cross-pollination is used to combine desirable traits, then genetic diversity and new traits are introduced, but self-pollination control becomes difficult
Solution Approach 1:
The patent extracts the self-pollination control problem by introducing parent plants with cytoplasmic male sterility (CMS) genes. These CMS parent plants naturally prevent self-pollination through genetic mechanisms, eliminating the need for manual emasculation or other complex control measures. The fertility restoration gene in the other parent then ensures proper seed set.
Solution Approach 2:
The patent uses the CMS gene system as an intermediary mechanism to control pollination. The CMS parent acts as a mediator that passively prevents self-pollination through genetic incompatibility, while the restorer parent mediates fertility recovery. This intermediary genetic system simplifies the overall pollination control process.
3Ease of operation
If manual emasculation is performed to prevent self-pollination, then cross-pollination control is achieved, but labor intensity and time consumption increase
Solution Approach 1:
The patent implements self-service pollination control through genetic mechanisms. The CMS parent plants automatically prevent self-pollination through cytoplasmic-nuclear incompatibility, and the fertility restoration gene in the other parent automatically restores fertility for cross-pollination. This self-regulating genetic system eliminates the need for manual emasculation operations.
Solution Approach 2:
The patent replaces the mechanical system of manual emasculation with a genetic system based on CMS and fertility restoration. Instead of physically removing anthers or controlling pollination mechanically, the system uses genetic incompatibility and restoration mechanisms to achieve the same pollination control objectives, significantly reducing labor and time requirements.
4Productivity
If hybrid varieties are developed to improve yield and traits, then agronomic quality is enhanced, but maintaining genetic uniformity becomes challenging
Solution Approach 1:
The patent performs preliminary development of highly homozygous inbred parent lines through multiple generations of self-pollination and selection before creating the hybrid. This preliminary action ensures that the parental genomes are highly uniform and stable, which translates to uniform F1 hybrid progeny with consistent expression of desirable traits and high yield potential.
Solution Approach 2:
The patent uses homogeneous inbred parent lines with fixed genetic compositions to create the hybrid. The high degree of homozygosity in the parents ensures that all F1 hybrid plants receive identical genetic combinations, resulting in uniform phenotypic expression of yield, disease resistance, and other desirable traits across the entire hybrid population.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH011104. The invention thus relates to the plants, seeds and tissue cultures of the variety CH011104, and to methods for producing a corn plant produced by crossing a corn plant of variety CH011104 with itself or with another corn plant, such as a plant of another variety. The invention further relates to genetic complements of plants of variety CH011104.