Inbred Corn Line SLN55 Breeding Methods
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Solution Overview
Problem
The development of new inbred corn lines is a slow and costly process, requiring expertise and numerous steps, and existing inbred parent corn lines lose commercial competitiveness over time, necessitating the need for improved germplasm with enhanced yield, disease resistance, and trait technologies.
Innovation Solution
The introduction of the inbred corn line SLN55, which is a new yellow dent inbred corn line with specific physiological and morphological characteristics, and methods for producing SLN55-derived corn plants through self-pollination, sib-pollination, and hybrid production, including techniques for controlling male fertility and introducing desirable traits using backcrossing, haploid breeding, and mutation breeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional inbreeding techniques are used to develop new inbred corn lines, then genetic uniformity and homozygosity are improved, but the process is slow and costly, and commercial competitiveness is lost over time
Solution Approach 1:
The patent applies preliminary action by using pre-existing inbred lines (e.g., B73, Mo17, W22) as starting materials that have already been developed through traditional inbreeding. These pre-characterized lines serve as the foundation for creating new inbred lines more efficiently, avoiding the need to start from scratch with long-term inbreeding processes.
Solution Approach 2:
The patent changes parameters by systematically varying crossing schemes, selection criteria, and environmental conditions during the breeding process. By manipulating these parameters, the patent accelerates the development of new inbred lines while maintaining genetic uniformity, resolving the time-uniformity contradiction.
2Stability of the object's composition
If inbred corn lines are developed through multiple generations of inbreeding, then homozygosity is improved, but vigor decreases and additional inbreeding merely increases seed production
Solution Approach 1:
The patent uses pre-developed inbred lines that have already achieved high homozygosity through previous breeding programs. By building upon this foundational work rather than starting new inbreeding sequences, the patent maintains plant vigor while achieving the desired homozygosity more efficiently.
Solution Approach 2:
The patent copies and combines genetic material from proven inbred lines to create new lines with desired characteristics. This copying approach allows the maintenance of vigor by using genetically sound parent lines while achieving homozygosity through controlled crossing and selection.
3Productivity
If existing inbred parent corn lines are used for hybrid production, then immediate commercial value is achieved, but they lose competitiveness over time due to lack of improvement
Solution Approach 1:
The patent performs preliminary characterization and evaluation of existing inbred lines to identify their strengths and limitations. This preliminary work enables the strategic development of improved lines that maintain productivity while extending commercial competitiveness through continuous improvement.
Solution Approach 2:
The patent systematically improves inbred lines by changing parameters such as yield traits, disease resistance, and environmental adaptability. This continuous parameter improvement allows existing inbred lines to maintain commercial competitiveness for extended periods while producing high-yielding hybrids.
4Reliability
If comprehensive breeding programs are implemented to improve yield and disease resistance, then plant performance is improved, but the process requires extensive expertise and numerous steps
Solution Approach 1:
The patent segments the breeding program into manageable components: selecting parent lines, planning crosses, evaluating progeny, and selecting advanced lines. This segmentation reduces the overall complexity by breaking down the comprehensive breeding program into discrete, controllable steps that can be systematically executed.
Solution Approach 2:
The patent uses intermediary evaluation processes and selection criteria that simplify the breeding program. By introducing intermediate selection stages and evaluation metrics, the patent reduces the complexity of managing comprehensive breeding programs while maintaining improvements in plant health and yield.
Data Source
AI summary
An inbred corn line, designated SLN55, the plants and seeds of the inbred corn line SLN55, methods for producing a corn plant, either inbred or hybrid, produced by crossing the inbred corn line SLN55 with itself or with another corn plant, and hybrid corn seeds and plants produced by crossing the inbred line SLN55 with another corn line or plant and to methods for producing a corn plant containing in its genetic material one or more transgenes and to the transgenic corn plants produced by that method. This invention also relates to inbred corn lines derived from inbred corn line SLN55, to methods for producing other inbred corn lines derived from inbred corn line SLN55 and to the inbred corn lines derived by the use of those methods.