Hybrid Corn CH979072 Cytoplasmic 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 CH979072, which incorporates genetic modifications and cytoplasmic male sterility to prevent self-pollination, along with specific traits like herbicide resistance and disease resistance, achieved through genetic transformation and backcrossing techniques, allowing for controlled cross-pollination and stable hybrid seed production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical emasculation is used to prevent self-pollination, then self-pollination is prevented, but breeding efficiency is reduced due to additional manual labor
Solution Approach 1:
The patent replaces the mechanical/manual emasculation process with a genetic/cytoplasmic solution. By introducing cytoplasmic male sterility (CMS) through genetic transformation, the plant automatically prevents self-pollination without requiring manual removal of male flowers, thus eliminating the labor-intensive mechanical process while maintaining reliable prevention of self-pollination.
Solution Approach 2:
The CMS system enables the plant to prevent self-pollination autonomously through its own genetic machinery. The cytoplasmic sterility factors expressed in the plant's cells automatically inhibit pollen formation and self-fertilization, freeing the breeder from manual emasculation tasks and improving breeding efficiency.
2Adaptability or versatility
If hybrid corn varieties are developed through traditional cross-pollination, then genetic diversity is achieved, but genetic stability and uniformity are difficult to maintain
Solution Approach 1:
The patent employs preliminary action by first developing and stabilizing inbred lines through repeated self-pollination and selection before creating the hybrid. This preliminary process ensures genetic stability and uniformity are established in the parent lines, allowing the subsequent hybrid cross to produce uniform F1 progeny with consistent genetic composition while maintaining the desired genetic diversity.
Solution Approach 2:
The breeding program is segmented into distinct phases: development of inbred parent lines, creation of hybrid crosses, and evaluation of F1 hybrids. This segmentation allows each phase to be optimized independently, ensuring genetic stability is achieved in inbreds before hybridization, thereby maintaining overall genetic stability while achieving diversity through controlled crosses.
3Adaptability or versatility
If multiple desirable traits are combined in a single hybrid variety, then breeding complexity increases, but achieving uniformity and genetic stability becomes more difficult
Solution Approach 1:
The patent merges multiple desirable traits into a single hybrid variety by combining them in the F1 generation through strategic cross-pollination of inbred lines that each carry specific traits. The hybrid F1 progeny exhibit uniformity and genetic stability despite carrying multiple traits, as all traits are present in heterozygous state and expressed uniformly across the population.
Solution Approach 2:
The hybrid variety functions as a composite genetic system integrating multiple traits (disease resistance, yield, uniformity, etc.) into a single stable genotype. The F1 hybrid acts as a composite material combining genetic contributions from both parents, achieving uniform expression of multiple desirable traits while maintaining genetic stability through controlled heterozygosity.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH979072. The invention thus relates to the plants, seeds and tissue cultures of the variety CH979072, and to methods for producing a corn plant produced by crossing a corn plant of variety CH979072 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 CH979072.