Hybrid Corn CH720554 Uniformity via Segmentation

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Solution Overview

Problem

Corn breeding techniques face challenges in developing uniform hybrid plants with desirable traits such as high yield, disease resistance, and uniformity, as existing methods often result in unpredictable performance due to genetic non-uniformity among hybrid plants.

Innovation Solution

The development of the hybrid corn variety CH720554, which incorporates a cytoplasmic or nuclear factor for male sterility and introduces desired traits like herbicide resistance, insect resistance, and disease resistance through genetic loci, ensuring uniformity and stability by using backcrossing and genetic transformation techniques.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional breeding methods are used to develop hybrid corn, then various desirable traits can be combined in a single variety, but the hybrid plants show genetic non-uniformity leading to unpredictable performance

Engineering Contradiction:
Improvecombination of desirable traitsVSAvoidperformance uniformity
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The breeding process is segmented into distinct phases: developing homozygous inbred lines through repeated 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.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent changes the genetic parameter from heterogeneous breeding populations to homozygous inbred lines with fixed gene loci. By standardizing the genetic composition through inbreeding and then crossing standardized lines, the F1 hybrids achieve uniform performance while combining multiple desirable traits.

Inventive Principle:
Principle #35Parameter changes

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 development process requires many generations and extensive time

Engineering Contradiction:
Improvegenetic uniformityVSAvoidbreeding development time
Core Design Contradiction:
Stability of the object's compositionVSLoss of time

Solution Approach 1:

Homozygous inbred lines are developed beforehand through repeated self-pollination and selection over multiple generations. These standardized parental lines are then crossed to produce the commercial F1 hybrid seed, allowing the time-consuming homozygization process to be completed in advance during breeding program development.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

Once homozygous inbred lines are developed, they serve as standardized copies that can be repeatedly crossed to produce uniform F1 hybrids. The genetic composition of the parental lines is fixed and replicated across multiple production cycles, eliminating the need to re-develop the lines each time commercial seed is produced.

Inventive Principle:
Principle #26Copying

3Productivity

If cross-pollination is used to produce hybrid plants, then genetic diversity and vigor are achieved, but the resulting population is non-uniform and performance is unpredictable

Engineering Contradiction:
Improvehybrid vigorVSAvoidperformance consistency
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent changes the genetic parameter from heterogeneous breeding populations to homozygous inbred lines with fixed gene loci. By standardizing the genetic composition through inbreeding and then crossing standardized lines, the F1 hybrids achieve uniform performance while combining multiple desirable traits.

Inventive Principle:
Principle #35Parameter changes

4Adaptability or versatility

If breeding populations are used to develop new inbred plants, then various traits can be combined from broad-based sources, but the process requires extensive selection and evaluation of crosses

Engineering Contradiction:
Improvetrait combination from diverse sourcesVSAvoidbreeding program complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The breeding program is segmented into independent modules: developing individual inbred lines from diverse germplasm sources through self-pollination and selection, then systematically crossing these standardized lines. This modular approach allows trait combination from diverse sources while managing complexity through standardized procedures.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS7807899B2Plants and seeds of hybrid corn variety CH720554
Publication Date: 2010.10.05 MONSANTO TECHNOLOGY LLC

AI summary

According to the invention, there is provided seed and plants of the hybrid corn variety designated CH720554. The invention thus relates to the plants, seeds and tissue cultures of the variety CH720554, and to methods for producing a corn plant produced by crossing a corn plant of variety CH720554 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 CH720554.