Inbred Corn Lines for Multi-Trait Hybrid Vigor and Seed Yield
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Solution Overview
Problem
Existing maize breeding methods struggle to combine desirable traits such as increased water stress resistance, waxy starch, male sterility, modified carbohydrate metabolism, and disease resistance into a single variety, leading to inconsistent hybrid performance and reduced vigor in inbred plants.
Innovation Solution
Development of maize varieties TPJC7638, KFX6631, KFX7481, KFX5450, KHI5609, KFX5474, and KFX6684, which can incorporate additional traits like waxy starch, male sterility, and disease resistance through genetic modification and hybridization, along with methods like backcross breeding and marker-enhanced selection to ensure consistent trait expression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inbred plants are used for hybrid seed production, then hybrid vigor is improved, but inbred plant vigor and seed yield are reduced
Solution Approach 1:
The patent employs recurrent selection and backcross breeding methods that systematically change genetic parameters over multiple generations. By selecting superior individuals and repeatedly crossing them with the recurrent parent while maintaining homozygosity, the breeding process transforms the genetic composition to accumulate desirable traits while preserving inbred characteristics, thereby improving hybrid vigor without sacrificing parental seed production capability
2Adaptability or versatility
If multiple desirable traits are combined into a single variety, then trait diversity is improved, but breeding complexity increases
Solution Approach 1:
The breeding program is segmented into distinct phases: initial cross to combine traits, followed by recurrent selection cycles, then backcrossing generations, and final inbred development. Each phase has specific objectives and selection criteria. This segmentation allows complex multi-trait combinations to be achieved through manageable sequential steps rather than attempting to combine all traits simultaneously, reducing overall program complexity while maintaining trait diversity
Solution Approach 2:
The patent performs preliminary trait combination in the initial cross between donor and recurrent parent, creating a foundation line that already possesses multiple desirable traits. Subsequent breeding cycles then focus on refining and stabilizing these traits rather than introducing them from scratch. This preliminary action simplifies later breeding steps by establishing a genetically enriched base that requires less complex manipulation to achieve the final multi-trait variety
Data Source
AI summary
The present invention provides an inbred corn line designated TPJC7638, KFX6631, KFX7481, KFX5450, KHI5609, KFX5474, and KFX6684, methods for producing a corn plant by crossing plants of the inbred line TPJC7638, KFX6631, KFX7481, KFX5450, KHI5609, KFX5474, and KFX6684 with plants of another corn plant. The invention further encompasses all parts of inbred corn line TPJC7638, KFX6631, KFX7481, KFX5450, KHI5609, KFX5474, and KFX6684, including culturable cells. Additionally, provided herein are methods for introducing transgenes into inbred corn line TPJC7638, KFX6631, KFX7481, KFX5450, KHI5609, KFX5474, and KFX6684, and plants produced according to these methods.