Hybrid Corn Variety Breeding with CMS and Restorer Lines
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Solution Overview
Problem
Existing corn breeding techniques struggle to develop hybrids with uniformity and stability, incorporating desirable traits such as yield, disease resistance, and drought tolerance, while maintaining genetic diversity and avoiding self-pollination.
Innovation Solution
Development of the hybrid corn variety CH010377, which includes genetic modifications for traits like male sterility, herbicide resistance, and disease resistance, achieved through cytoplasmic inheritance and genetic transformation, along with a method for controlled cross-pollination to ensure hybrid purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-pollination is prevented through male sterility mechanisms, then hybrid purity is improved, but breeding complexity increases
Solution Approach 1:
The patent extracts and utilizes cytoplasmic male sterility (CMS) to remove the need for manual emasculation in hybrid seed production. The CMS trait is introduced into the female parent line, which naturally prevents pollen production without requiring physical intervention to remove stamens, thereby maintaining hybrid purity while simplifying the breeding process.
Solution Approach 2:
The patent employs a restorer line as an intermediary that carries nuclear genes capable of restoring male fertility. When the CMS female parent is crossed with the restorer line, the resulting F1 hybrid exhibits restored male fertility, allowing controlled pollination while maintaining the benefits of CMS during the critical seed production stage.
2Productivity
If multiple desirable traits are incorporated into a single hybrid variety, then agricultural productivity is improved, but genetic stability becomes more difficult to maintain
Solution Approach 1:
The patent segments complex traits into distinct genetic components that can be independently managed. For example, disease resistance, herbicide tolerance, and yield-related traits are introduced as separate transgenic events or through separate backcrossing programs, allowing each trait to be validated and stabilized independently before combination in the final hybrid variety.
Solution Approach 2:
The patent utilizes molecular markers and genomic selection to monitor and maintain genetic stability across multiple trait introductions. By changing the parameters of selection from phenotypic to genotypic markers, the breeding program can track the inheritance of multiple traits simultaneously and ensure genetic stability is maintained throughout the breeding process.
3Adaptability or versatility
If conventional breeding methods are used to develop hybrid corn, then genetic diversity is maintained, but uniformity in hybrid performance deteriorates
Solution Approach 1:
The patent replaces conventional mechanical breeding methods (manual cross-pollination, field selection) with molecular biology techniques including DNA marker-assisted selection and genomic prediction. These molecular tools enable precise tracking of parental genome contribution and early-generation selection, maintaining genetic diversity from diverse parental lines while ensuring uniform hybrid performance through molecular verification of parental purity and expected genotype composition.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH010377. The invention thus relates to the plants, seeds and tissue cultures of the variety CH010377, and to methods for producing a corn plant produced by crossing a corn plant of variety CH010377 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 CH010377.