Maize Inbred NPFA6899 Trait Stabilization for Hybrid Homogeneity
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Solution Overview
Problem
Current corn breeding methods face challenges in producing high-yielding, agronomically sound plants that are uniformly adapted across the U.S. Corn Belt, as regional growing conditions and specific issues like Gray Leaf Spot infection, cool temperatures, and soil pH levels require region-specific traits, and existing methods struggle to introduce desired traits efficiently and maintain homogeneity in hybrid combinations.
Innovation Solution
The development of the maize inbred plant NPFA6899, which includes a mutant or transgenic gene conferring traits such as herbicide resistance, insect resistance, and disease resistance, and a process for producing F1 hybrid maize seeds by crossing NPFA6899 with other maize plants, allowing for the introduction and stabilization of desired traits through backcrossing and selection, ensuring consistent physiological and morphological characteristics across generations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional corn breeding methods are used, then existing corn varieties can be maintained, but the ability to introduce desired traits efficiently and maintain homogeneity in hybrid combinations is insufficient
Solution Approach 1:
The patent applies preliminary action by developing and stabilizing desired traits in inbred lines before using them in hybrid production. The inbred lines are bred to fixation for multiple traits including disease resistance, insect resistance, and agronomic characteristics, ensuring that when these inbreds are crossed to produce F1 hybrids, the desired traits are already established and will be consistently passed on, thereby improving trait introduction efficiency while maintaining hybrid homogeneity.
Solution Approach 2:
The patent utilizes parameter changes by systematically altering and selecting for specific genetic parameters in the inbred lines. Multiple traits are simultaneously selected and stabilized through controlled breeding programs, changing the genetic composition parameters of the inbreds before hybrid production. This ensures that the inbreds carry stable, fixed alleles for desired traits, which then translate to consistent trait expression in the F1 hybrids, resolving the contradiction between trait introduction efficiency and hybrid homogeneity.
2Adaptability or versatility
If region-specific traits are introduced to address local growing conditions, then adaptability to regional conditions improves, but the complexity of breeding programs increases
Solution Approach 1:
The patent applies segmentation by dividing the breeding program into distinct phases: first developing and stabilizing region-specific traits in inbred lines through controlled crosses and selection, then using these pre-prepared inbreds in subsequent hybrid production. This segmentation allows the complex task of creating regionally adapted varieties to be broken down into manageable steps, where trait stabilization occurs in isolation before being integrated into hybrid programs, thereby reducing overall program complexity while maintaining regional adaptability.
Solution Approach 2:
The patent implements local quality by developing inbred lines with specific traits tailored to particular regional conditions (such as Gray Leaf Spot resistance for specific geographic areas) while maintaining the ability to produce uniform F1 hybrids. Each inbred line is optimized for local requirements but follows the same systematic breeding protocol, allowing region-specific adaptation without proportionally increasing breeding program complexity across all regions.
3Stability of the object's composition
If inbred lines are used to produce uniform F1 hybrids, then hybrid consistency is improved, but the vigor and seed yield of the inbreds themselves decreases
Solution Approach 1:
The patent applies the intermediary principle by using inbreds as intermediate stepping stones rather than final products. The inbreds are developed and stabilized to serve as uniform parental lines for F1 hybrid production. While the inbreds themselves may have reduced vigor compared to outcrossed populations, their uniformity and stability as intermediaries enable consistent F1 hybrid production. The system accepts the intermediate nature of inbreds, optimizing them for their specific role as uniform parents rather than for maximum seed yield as end-products.
Data Source
AI summary
The present invention provides an inbred corn line designated NPFA6899, methods for producing a corn plant by crossing plants of the inbred line NPFA6899 with plants of another corn plant. The invention further encompasses all parts of inbred corn line NPFA6899, including culturable cells. Additionally provided herein are methods for introducing transgenes into inbred corn line NPFA6899, and plants produced according to these methods.