Hybrid Corn CH845645 CMS Pollination Control
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Solution Overview
Problem
Corn breeding techniques face challenges in developing uniform hybrid varieties with desirable traits such as high yield, disease resistance, and uniform germination due to genetic non-uniformity and unpredictability in cross-pollination, which requires the development of stable inbred plants and controlled pollination methods.
Innovation Solution
The development of the hybrid corn variety CH845645, which includes genetic loci for traits like male sterility, herbicide resistance, and disease resistance, and uses cytoplasmic-male sterility (CMS) to control pollination, ensuring uniformity and desirable characteristics through controlled crossing and tissue culture regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If natural cross-pollination is used in corn breeding, then genetic diversity is increased, but uniformity and predictability of hybrid performance deteriorate
Solution Approach 1:
The breeding population is segmented into distinct inbred lines through repeated self-pollination, creating genetically uniform parental groups. This segmentation allows controlled crossing between specific lines while maintaining overall genetic diversity across the breeding program.
Solution Approach 2:
Inbred parental lines are developed and stabilized through multiple generations of self-pollination before hybridization. This preliminary action ensures genetic uniformity in the parents, which then produces uniform hybrid offspring with predictable performance.
2Stability of the object's composition
If repeated self-pollination is used to develop inbred lines, then genetic uniformity and stability are improved, but breeding time and complexity increase
Solution Approach 1:
Self-pollination is performed continuously over multiple generations without interruption to achieve complete homozygosity. This continuous application of the same operation efficiently develops stable inbred lines.
Solution Approach 2:
The corn plants self-pollinate automatically without requiring manual intervention for each pollination event. This self-service mechanism accelerates the inbreeding process compared to manual cross-pollination methods.
3Manufacturing precision
If manual cross-pollination control is implemented, then hybrid uniformity is improved, but labor requirements and operational complexity increase
Solution Approach 1:
Male sterile inbred lines serve as intermediaries in the cross-pollination process. The female parent's male sterility automatically prevents self-pollination, eliminating the need for manual emasculation while ensuring controlled hybridization with the male parent.
Solution Approach 2:
The mechanical process of manual emasculation and pollination control is replaced by a biological mechanism (cytoplasmic male sterility). This substitution automates the pollination control process, reducing labor while maintaining hybrid uniformity.
4Ease of operation
If cytoplasmic male sterility is used to control pollination, then ease of hybrid seed production is improved, but genetic uniformity of the sterile trait must be maintained
Solution Approach 1:
The female parent line is maintained as a homogeneous population with uniform cytoplasmic male sterility through continuous backcrossing to the same male sterile inbred. This homogeneity ensures all plants exhibit the sterile trait uniformly, facilitating reliable hybrid seed production.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH845645. The invention thus relates to the plants, seeds and tissue cultures of the variety CH845645, and to methods for producing a corn plant produced by crossing a corn plant of variety CH845645 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 CH845645.