Hybrid Corn CH546449 Cytoplasmic Male Sterility Control
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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 introduction of new genetic modifications and traits.
Innovation Solution
The development of the hybrid corn variety CH546449, which incorporates genetic modifications for traits like male sterility, herbicide resistance, and disease resistance, utilizing cytoplasmic and nuclear factors, and genome editing techniques like CRISPR-Cas systems to introduce specific alleles and transgenes, ensuring stable expression of desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional breeding methods are used to develop hybrid corn varieties, then genetic diversity and trait combination are improved, but genetic stability and control over self-pollination are worsened
Solution Approach 1:
The patent uses cytoplasmic male sterility (CMS) as an intermediary mechanism to control pollination. The CMS cytoplasm acts as a mediator that prevents self-pollination by rendering the plant male sterile, while allowing controlled cross-pollination with fertile plants carrying restorer genes. This resolves the contradiction by providing genetic control (stability) while enabling hybrid trait combination (adaptability).
Solution Approach 2:
The patent changes the genetic parameter of male fertility through cytoplasmic manipulation. By introducing CMS cytoplasm with specific nuclear background, the plant transitions from fertile to male sterile state, preventing self-pollination. This parameter change enables controlled cross-pollination while maintaining genetic stability of the hybrid variety.
2Productivity
If cross-pollination is used to develop hybrid varieties, then genetic diversity and yield potential are improved, but control over pollination and uniformity are worsened
Solution Approach 1:
The CMS system acts as an intermediary control mechanism that ensures uniform cross-pollination. All plants with CMS cytoplasm are uniformly male sterile, ensuring they all receive pollen only from designated fertile male parents. This intermediary mechanism guarantees uniformity in the hybrid population while enabling high yield through controlled cross-pollination.
Solution Approach 2:
The CMS plants automatically prevent self-pollination through their cytoplasmic sterility mechanism, eliminating the need for manual emasculation or other intervention-based methods. This self-service mechanism ensures uniform cross-pollination across the entire population, maintaining both yield potential and uniformity.
3Stability of the object's composition
If inbred plants are developed through self-pollination, then genetic uniformity is improved, but genetic diversity and adaptability are worsened
Solution Approach 1:
The patent maintains continuous useful action by using CMS plants as a permanent source of female gametes for hybrid production. The CMS line continuously produces uniform female plants that can be crossed with various male parents, preserving genetic uniformity of the female parent while enabling genetic diversity through multiple male parents. This continuity allows the same uniform genetic background to be combined with diverse traits from different male lines.
Data Source
AI summary
According to the invention, there is provided seed and plants of the hybrid corn variety designated CH546449. The invention thus relates to the plants, seeds and tissue cultures of the variety CH546449, and to methods for producing a corn plant produced by crossing a corn plant of variety CH546449 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 CH546449.