Hybrid Corn CH011102 Breeding via Cytoplasmic Male Sterility
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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 trait introduction and hybrid seed production.
Innovation Solution
The development of the hybrid corn variety CH011102, 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 methods for regenerating plants with specific physiological and morphological characteristics, and a process for crossing parent plants to prevent self-pollination and enhance cross-pollination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional self-pollination breeding methods are used, then genetic stability is maintained, but hybrid variety development and trait introduction efficiency are limited
Solution Approach 1:
The patent segments the breeding process by separating male and female reproductive functions through cytoplasmic male sterility (CMS). The female parent is rendered sterile via CMS cytoplasm, while the male parent retains fertility. This segmentation enables controlled cross-pollination without self-pollination contamination, improving hybrid seed production efficiency while maintaining genetic stability through precise parental control.
Solution Approach 2:
The patent introduces cytoplasmic male sterility as an intermediary mechanism to prevent self-pollination. The CMS cytoplasm acts as a biological mediator that blocks the female parent's ability to self-pollinate, forcing cross-pollination with the male parent. This intermediary solution resolves the contradiction by enabling efficient hybrid development while maintaining genetic purity through controlled mating.
2Adaptability or versatility
If cross-pollination is enforced to develop hybrids, then hybrid vigor and trait diversity are improved, but self-pollination control and genetic purity become challenging
Solution Approach 1:
The patent employs self-service mechanisms where the cytoplasmic male sterility system automatically prevents self-pollination in the female parent without requiring external intervention. The CMS cytoplasm inherently blocks self-fertilization, and the restorer gene in the male parent automatically restores fertility for cross-pollination. This self-regulating system ensures genetic purity and trait diversity simultaneously, as the biological mechanism itself enforces cross-pollination while preventing contamination.
3Productivity
If male sterility factors are introduced to prevent self-pollination, then hybrid seed production is enhanced, but plant fertility and seed set may be affected
Solution Approach 1:
The patent applies local quality by introducing male sterility specifically in the female parent's cytoplasm while maintaining nuclear fertility genes. The CMS cytoplasm creates local sterility in the female line, preventing self-pollination, while the male parent retains full fertility through restorer genes. This localized application of sterility ensures high hybrid seed production from cross-pollination while maintaining plant fertility where needed, resolving the contradiction between hybrid production efficiency and plant fertility.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH011102. The invention thus relates to the plants, seeds and tissue cultures of the variety CH011102, and to methods for producing a corn plant produced by crossing a corn plant of variety CH011102 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 CH011102.