Hybrid Maize Breeding With Stable Trait Introgression
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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 in plant characteristics, which are crucial for commercial crop production.
Innovation Solution
The development of a novel maize hybrid variety X96T031, produced by crossing specific inbred varieties and incorporating genetic loci for traits like male sterility, disease resistance, and altered metabolism through backcrossing and transformation, along with cytoplasmically-inherited traits to enhance hybrid performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plant breeding methods are used to combine multiple desirable traits, then disease resistance and yield improvement can be achieved, but uniformity and stability of plant characteristics deteriorate
Solution Approach 1:
The patent segments the breeding process into distinct phases: developing pure inbred lines with specific traits, then crossing them to produce uniform hybrids. This segmentation allows disease resistance to be introduced through controlled crossing while maintaining uniformity through the use of homozygous inbred parents, resolving the contradiction between trait diversity and plant uniformity.
Solution Approach 2:
The patent applies preliminary action by extensively developing and stabilizing inbred parent lines before hybridization. Multiple generations of selfing and selection are performed to ensure the inbred lines are homozygous and stable, so that when crossed, they produce uniform F1 hybrids with consistent characteristics, preventing uniformity deterioration while achieving disease resistance.
2Productivity
If multiple traits are combined in a single hybrid, then agronomic quality and yield improve, but the complexity of maintaining uniformity worsens
Solution Approach 1:
The patent merges multiple desirable traits into a single hybrid by crossing two inbred lines, each contributing specific traits. This combining achieves high yield and agronomic quality while maintaining uniformity because both parents are homozygous, ensuring all F1 hybrids receive identical genetic combinations, thus reducing the complexity of maintaining uniformity.
Solution Approach 2:
The patent creates a universal hybrid system where a single F1 hybrid combines multiple functions: disease resistance from one parent, yield potential from both parents, and uniformity through homozygous inheritance. This multi-functional hybrid resolves the contradiction by achieving high productivity while simplifying uniformity maintenance through a single, stable genetic combination.
3Productivity
If cytoplasmic male sterility is introduced to prevent self-pollination, then hybrid seed production efficiency improves, but the complexity of the genetic system worsens
Solution Approach 1:
The patent extracts the male fertility function from the nuclear genome and places it in the cytoplasm through cytoplasmic male sterility (CMS). This extraction allows female plants to be naturally male-sterile, eliminating the need for manual detasseling and improving hybrid seed production efficiency. The genetic complexity is managed by using simple maintainer and restorer lines that interact with the CMS cytoplasm through well-defined nuclear genes.
Data Source
AI summary
A novel maize variety designated X96T031 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 X96T031 with another maize plant are disclosed. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into X96T031 through backcrossing or genetic transformation, and to the maize seed, plant and plant part produced thereby are described. Maize variety X96T031, the seed, the plant produced from the seed, and variants, mutants, and minor modifications of maize variety X96T031 are provided. Methods for producing maize varieties derived from maize variety X96T031 and methods of using maize variety X96T031 are disclosed.