Corn Variety CV198691 Breeding for Genetic Stability
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Solution Overview
Problem
Corn breeding aims to combine desirable traits like yield, disease resistance, and uniformity, but existing methods struggle to develop stable inbred plants with predictable performance due to genetic non-uniformity from cross-pollination, leading to unpredictable hybrid traits.
Innovation Solution
The development of the corn variety CV198691, which includes a cytoplasmic or nuclear factor for male sterility to prevent self-pollination, along with specific genetic loci for traits like herbicide tolerance and disease resistance, and the use of tissue culture for regenerating plants with consistent physiological and morphological characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-pollination is used to combine desirable traits from different plants, then genetic diversity and trait combination are improved, but genetic non-uniformity and unpredictable performance occur
Solution Approach 1:
The breeding process is divided into distinct phases: creating diverse F1 hybrids through cross-pollination, then separating and selecting uniform F2 progeny through self-pollination. This segmentation allows the system to first benefit from genetic diversity in F1, then achieve uniformity and predictability in F2, resolving the contradiction between trait combination and performance reliability.
Solution Approach 2:
The patent performs preliminary cross-pollination to create F1 hybrids with desirable traits before conducting self-pollination to generate uniform F2 progeny. This preliminary action of cross-pollination establishes the genetic basis for trait combination, followed by self-pollination that stabilizes these traits and ensures uniformity, thereby resolving the contradiction.
2Stability of the object's composition
If self-pollination is used to create uniform inbred plants, then genetic uniformity and stability are improved, but loss of genetic diversity and limited trait combination occur
Solution Approach 1:
The breeding program segments the process into F1 cross-pollination (diverse) and F2 self-pollination (uniform) phases. The F1 generation maintains genetic diversity and trait combination, while the F2 generation achieves uniformity through self-pollination. This segmentation allows both diversity and uniformity to be achieved at different stages, resolving the contradiction.
Solution Approach 2:
Cross-pollination is performed as a preliminary action to create F1 hybrids with diverse traits before self-pollination is used to generate uniform F2 progeny. This preliminary diversity-building step ensures that when self-pollination occurs, the resulting uniform plants already possess the desired trait combinations, resolving the contradiction between uniformity and trait diversity.
3Stability of the object's composition
If multiple breeding generations are used to develop inbred plants, then genetic stability and uniformity are improved, but breeding time and development complexity increase
Solution Approach 1:
The patent uses preliminary cross-pollination to create F1 hybrids that already exhibit many desirable traits and genetic stability. This preliminary action reduces the number of subsequent self-pollination generations needed to achieve uniformity, thereby shortening the overall breeding cycle while maintaining genetic stability and uniformity.
Data Source
AI summary
According to the invention, there is provided seed and plants of the corn variety designated CV198691. The invention thus relates to the plants, seeds and tissue cultures of the variety CV198691, and to methods for producing a corn plant produced by crossing a corn plant of variety CV198691 with itself or with another corn plant, such as a plant of another variety. The invention further relates to corn seeds and plants produced by crossing plants of variety CV198691 with plants of another variety, such as another inbred line. The invention further relates to the inbred and hybrid genetic complements of plants of variety CV198691.