Corn Variety CV996840 Breeding for Genetic Uniformity
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Solution Overview
Problem
Current corn breeding techniques face challenges in developing uniform corn hybrids with desirable traits such as high yield, disease resistance, and uniformity, as they often result in unpredictable performance due to genetic non-uniformity among hybrid plants.
Innovation Solution
The development of the corn variety CV996840, which is a stable inbred line with specific traits like male sterility, herbicide tolerance, and disease resistance, achieved through backcrossing and genetic transformation techniques, ensuring uniformity and desirable characteristics in progeny plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional corn breeding techniques are used to develop hybrids, then various desirable traits can be combined in a single variety, but the resulting hybrid plants exhibit genetic non-uniformity leading to unpredictable performance
Solution Approach 1:
The breeding process is segmented into distinct phases: developing homozygous inbred lines through self-pollination, then crossing these standardized lines to produce uniform F1 hybrids. This segmentation ensures genetic uniformity within each phase while allowing trait combination across phases.
Solution Approach 2:
The patent changes the genetic uniformity parameter by enforcing homozygosity in parental inbred lines through multiple generations of self-pollination and selection. This parameter change ensures that all plants in the F1 hybrid generation are genetically uniform, making performance predictable.
2Stability of the object's composition
If self-pollination is used to develop homozygous inbred plants, then uniform true-breeding progeny are produced, but the breeding process requires multiple generations and extensive selection time
Solution Approach 1:
Homozygous inbred lines are developed beforehand and maintained as stable parental stocks. Once these preliminary inbred lines are established, they can be repeatedly crossed without requiring further generation development, significantly reducing the time for subsequent hybrid production.
Solution Approach 2:
The genetic composition of successful inbred lines is copied and propagated through seed production. Once a homozygous inbred line with desired traits is developed, its genetic makeup is replicated in subsequent generations, eliminating the need to restart the lengthy self-pollination process.
3Adaptability or versatility
If cross-pollination is used to produce hybrid plants, then genetic diversity is introduced, but the resulting population is non-uniform and performance becomes unpredictable
Solution Approach 1:
Different parental inbred lines are assigned specific roles (male or female parent) with complementary traits. Each parent contributes specific genetic qualities locally, and their controlled cross produces uniform F1 hybrids that combine these localized traits in a predictable manner.
Solution Approach 2:
The F1 hybrid generation acts as an intermediary between the homozygous parental lines. This intermediate generation uniformizes the genetic expression by being heterozygous at all loci where parents differ, creating a uniform population with predictable performance while maintaining genetic diversity from the parental contributions.
Data Source
AI summary
According to the invention, there is provided seed and plants of the corn variety designated CV996840. The invention thus relates to the plants, seeds and tissue cultures of the variety CV996840, and to methods for producing a corn plant produced by crossing a corn plant of variety CV996840 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 CV996840 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 CV996840.