Hybrid Maize Line Development With CMS and Stable Trait Stacking
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Solution Overview
Problem
Existing hybrid maize development methods struggle to combine desirable traits such as disease resistance, heat and drought tolerance, and improved yield while maintaining uniformity and stability, which are crucial for commercial crop production.
Innovation Solution
A novel maize hybrid variety X07T068 is developed by crossing specific inbred varieties, incorporating genetic loci for traits like male sterility, disease resistance, and altered metabolism through backcrossing and transformation, and utilizing cytoplasmic traits for pollen abortion control, with regenerable tissue cultures to maintain desired characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional plant breeding methods are used to combine multiple desirable traits, then the complexity of the breeding process increases, but the uniformity and stability of the hybrid characteristics deteriorate
Solution Approach 1:
The patent segments the breeding process by using separate inbred parental lines (PH41F0 and PH2F5C) that each carry specific desirable traits. By dividing the complex trait combination task into manageable parental components, the method achieves uniform F1 hybrids with stable, predictable characteristics while combining multiple traits from different parents.
Solution Approach 2:
The patent applies preliminary action by developing and stabilizing the inbred parental lines (PH41F0 and PH2F5C) through multiple generations of inbreeding and selection before crossing. This preliminary stabilization of parental genetic composition ensures that the resulting F1 hybrids exhibit uniform and stable characteristics, resolving the contradiction between trait combination complexity and characteristic stability.
2Adaptability or versatility
If multiple genetic loci are introduced through backcrossing and transformation, then the number of traits increases, but the genetic complexity and difficulty of maintaining uniformity increase
Solution Approach 1:
The patent uses copying by creating identical copies of desirable genetic loci from parental lines through controlled backcrossing and transformation. Multiple copies of specific traits (such as disease resistance loci) are introduced into the hybrid background, increasing trait number while maintaining genetic manageability through repeated use of the same proven parental sources.
Solution Approach 2:
The patent applies parameter changes by systematically controlling the genetic composition parameters during backcrossing and transformation processes. By carefully adjusting the number of backcross generations and selecting for specific marker traits, the method introduces multiple desirable loci while managing genetic complexity and maintaining uniformity in the final hybrid variety.
3Ease of manufacture
If cytoplasmic traits are used for male sterility control, then the ease of hybrid seed production increases, but the dependency on specific cytoplasmic-nuclear interactions increases complexity
Solution Approach 1:
The patent uses cytoplasmic male sterility (CMS) as an intermediary mechanism to control pollination in hybrid seed production. The CMS trait acts as a biological mediator that automatically prevents self-pollination and ensures cross-pollination between parental lines, greatly simplifying hybrid seed production. The specific cytoplasmic-nuclear interactions are managed through standardized parental line development, making the complexity manageable and reproducible.
Data Source
AI summary
A novel maize variety designated X07T068 and seed, plants and plant parts thereof are produced by crossing inbred maize varieties. Methods for producing a maize plant by crossing hybrid maize variety X07T068 with another maize plant are disclosed. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into X07T068 through backcrossing or genetic transformation, and to the maize seed, plant and plant part produced thereby are described. Maize variety X07T068, the seed, the plant produced from the seed, and variants, mutants, and minor modifications of maize variety X07T068 are provided. Methods for producing maize varieties derived from maize variety X07T068 and methods of using maize variety X07T068 are disclosed.