Corn Variety CV109921 Breeding for Genetic Uniformity
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Solution Overview
Problem
Corn breeding techniques face challenges in developing uniform corn hybrids 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 corn variety CV109921, which includes specific genetic loci for traits like male sterility, herbicide tolerance, and disease resistance, along with cytoplasmically-inherited traits, and the use of tissue cultures to regenerate plants with consistent physiological and morphological characteristics, ensures the production of uniform inbred and hybrid seeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-pollination is used to create hybrid corn plants, then genetic diversity and trait combination are improved, but genetic uniformity and performance predictability deteriorate
Solution Approach 1:
The breeding program segments the breeding population into distinct inbred lines through repeated self-pollination, creating genetically uniform parental lines. This segmentation allows controlled crosses between specific lines while maintaining overall program diversity. Each inbred line represents a discrete genetic unit with uniform composition, resolving the contradiction between diversity and uniformity.
Solution Approach 2:
The patent applies preliminary action by developing homozygous inbred parental lines through multiple generations of self-pollination before performing hybrid crosses. This preliminary homozygization ensures that when crosses occur, the resulting hybrids have predictable and uniform performance, eliminating the genetic variability that would otherwise result from crossing heterozygous plants.
2Stability of the object's composition
If self-pollination is used to develop inbred lines, then genetic uniformity and homozygosity are improved, but genetic diversity and adaptability deteriorate
Solution Approach 1:
The breeding program segments the overall genetic pool into multiple distinct inbred lines, each with its own unique combination of traits. By maintaining several separate inbred lines rather than one homogeneous population, the program preserves genetic diversity at the population level while achieving uniformity within each line.
Solution Approach 2:
The patent creates composite genetic structures by combining multiple inbred lines with different trait compositions into a breeding program. Each inbred line acts as a component with specific genetic characteristics, and their combinations in hybrid production create genetically diverse populations with uniform performance characteristics.
3Stability of the object's composition
If multiple breeding generations are advanced to achieve homozygosity, then genetic uniformity is improved, but breeding time and program duration increase
Solution Approach 1:
The breeding program employs self-service through self-pollination, where each plant fertilizes itself to produce progeny. This self-service mechanism naturally increases homozygosity over generations without requiring external intervention for each pollination event, efficiently advancing the breeding process toward genetic uniformity.
Solution Approach 2:
The patent applies preliminary action by conducting multiple generations of self-pollination and selection before the inbred lines are used for hybrid production. This preliminary homozygization process, though time-consuming, is performed in advance so that the actual hybrid breeding and production can proceed efficiently with uniform, predictable results.
4Reliability
If inbred parental lines are developed and maintained, then hybrid uniformity and performance predictability are improved, but breeding program complexity and management requirements increase
Solution Approach 1:
The breeding program segments the breeding population into distinct, well-defined inbred lines with unique identification and characteristic profiles. This segmentation creates manageable genetic units that can be systematically tracked, crossed, and evaluated, reducing the complexity of managing overall program diversity while ensuring hybrid uniformity.
Data Source
AI summary
According to the invention, there is provided seed and plants of the corn variety designated CV109921. The invention thus relates to the plants, seeds and tissue cultures of the variety CV109921, and to methods for producing a corn plant produced by crossing a corn plant of variety CV109921 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 CV109921 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 CV109921.