Hybrid Corn CH302224 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 CH302224, which incorporates cytoplasmic or nuclear factors for male sterility and includes genetic loci conferring traits like herbicide resistance, disease resistance, and altered metabolism, along with a method for controlled cross-pollination using emasculation and self-incompatibility systems to prevent self-pollination and ensure genetic diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If self-pollination is allowed in corn breeding, then genetic uniformity is maintained, but hybrid seed production efficiency decreases due to inability to prevent self-pollination
Solution Approach 1:
The patent extracts and removes the male reproductive capability from the plant by introducing cytoplasmic male sterility factors, thereby eliminating self-pollination ability while maintaining genetic uniformity. This allows hybrid seed production without the risk of self-pollination compromising genetic stability.
Solution Approach 2:
The patent introduces nuclear restorer genes as intermediaries that can restore male fertility when needed for specific breeding purposes, while the cytoplasmic male sterility factor continues to prevent self-pollination in the hybrid population, thus mediating between the need for genetic stability and hybrid production efficiency.
2Adaptability or versatility
If multiple desirable traits are combined in hybrid corn, then agronomic quality improves, but breeding complexity increases
Solution Approach 1:
The patent uses cytoplasmic male sterility as a universal mechanism that works across different corn varieties and breeding programs, providing a single solution that simultaneously prevents self-pollination, ensures hybrid vigor, and facilitates the combination of multiple desirable traits without requiring variety-specific approaches.
Solution Approach 2:
The patent performs preliminary action by developing and maintaining cytoplasmic male sterile inbred lines before hybrid production, and by pre-introducing restorer genes into the breeding program framework, thereby simplifying subsequent hybrid development and trait combination processes.
3Productivity
If cytoplasmic male sterility is used to prevent self-pollination, then hybrid seed production efficiency increases, but genetic uniformity may be compromised
Solution Approach 1:
The patent maintains homogeneity by ensuring that all hybrid plants receive the same cytoplasmic male sterility factor from the female parent and the same nuclear restorer genes from the male parent, resulting in a genetically uniform hybrid population with consistent male fertility restoration and uniform expression of all traits.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH302224. The invention thus relates to the plants, seeds and tissue cultures of the variety CH302224, and to methods for producing a corn plant produced by crossing a corn plant of variety CH302224 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 CH302224.