Hybrid Corn CH867206 Male Sterility Breeding
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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 efficiency of hybrid seed production.
Innovation Solution
The development of the hybrid corn variety CH867206, which incorporates cytoplasmic or nuclear factors for male sterility and specific genetic loci conferring traits like herbicide resistance and disease resistance, along with tissue culture methods for regenerating plants with consistent physiological and morphological characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional self-pollination breeding methods are used, then genetic stability is maintained, but hybrid seed production efficiency is limited due to self-pollination
Solution Approach 1:
The patent extracts and removes the self-pollination capability from the corn plant by introducing male sterility genes (cms1, cms3, or gm21) that prevent pollen production or fertilization. This extraction of the self-pollination function allows for efficient hybrid seed production while maintaining genetic stability through controlled cross-pollination between sterile and fertile lines
Solution Approach 2:
The patent introduces intermediary elements including male sterility genes and their corresponding restorer genes as mediators. The sterile line acts as an intermediary that cannot self-pollinate, while the restorer gene serves as a mediator to restore fertility in the hybrid generation, enabling controlled hybridization while maintaining genetic stability across generations
2Productivity
If multiple desirable traits are combined in hybrid varieties, then yield and resistance are improved, but maintaining uniformity and genetic stability becomes more difficult
Solution Approach 1:
The patent segments the genetic material into distinct components: a sterile line containing specific male sterility genes (cms1, cms3, or gm21) and corresponding restorer genes, and a fertile line containing desired agronomic traits. This segmentation allows for controlled combination of multiple traits while maintaining uniformity through precise genetic control in the hybrid generation
Solution Approach 2:
The patent changes the genetic parameter of fertility control by introducing specific male sterility genes and their restorers. This parameter change enables uniform hybrid production with consistent expression of multiple desirable traits (yield, disease resistance, herbicide tolerance) while maintaining genetic stability through the restorer gene mechanism
3Productivity
If male sterility factors are introduced to prevent self-pollination, then hybrid seed production is facilitated, but device complexity increases
Solution Approach 1:
The patent implements a self-service genetic system where the male sterility genes (cms1, cms3, or gm21) automatically prevent self-pollination without requiring external intervention. The restorer gene in the fertile line automatically restores fertility in the hybrid, eliminating the need for manual emasculation or complex mechanical interventions, thereby simplifying the overall breeding process despite the genetic complexity
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH867206. The invention thus relates to the plants, seeds and tissue cultures of the variety CH867206, and to methods for producing a corn plant produced by crossing a corn plant of variety CH867206 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 CH867206.