Maize Inbred PH4D9Y Breeding via Preliminary Action
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Solution Overview
Problem
The development of new maize varieties and hybrids is a time-consuming process, requiring six to twelve years from the first cross to the delivery of finished seed, and existing technologies face challenges in combining desirable traits such as disease resistance, drought tolerance, and high yield in a stable and agronomically sound manner.
Innovation Solution
The introduction of the novel maize variety PH4D9Y, which involves crossing with another maize plant to introduce desired traits through backcross conversion, genetic manipulation, and transformation, including cytoplasmic or nuclear factors for male sterility, and the use of tissue culture to regenerate plants with specific physiological and morphological characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding processes are used to combine desirable traits, then disease resistance and drought tolerance can be achieved, but the development time requires six to twelve years
Solution Approach 1:
The patent applies preliminary action by pre-selecting and characterizing inbred lines with specific desirable traits (disease resistance, drought tolerance, yield potential) before combining them. The inbred lines are pre-screened for resistance to specific diseases (Northern corn leaf blight, Gray leaf spot, Southern rust) and pre-characterized for physiological traits, allowing the breeding program to start from optimized parental material rather than beginning scratch, thus reducing the overall development time while maintaining reliability of trait expression
2Productivity
If traditional maize breeding processes are used to combine desirable traits, then stable high-yielding varieties can be developed, but the process requires six to twelve years from first cross to finished seed
Solution Approach 1:
The patent applies segmentation by dividing the breeding program into distinct modular components: multiple inbred lines (PH4D9Y and others) each optimized for specific traits are developed separately, then systematically combined in controlled crosses. This modular approach allows parallel development of different trait combinations and accelerates the identification of high-yielding hybrids compared to traditional sequential breeding methods
Solution Approach 2:
The patent applies universality by developing inbred lines with multi-functional desirable traits that can be combined in various hybrid configurations. The inbred lines are selected for multiple attributes simultaneously (disease resistance, drought tolerance, yield potential, agronomic quality), making them versatile parental sources that can produce stable high-yielding hybrids across different environmental conditions and market requirements
3Stability of the object's composition
If maize varieties are bred to maintain stability across different environments, then agronomic soundness is achieved, but the breeding process becomes more complex and time-consuming
Solution Approach 1:
The patent applies parameter changes by systematically evaluating and selecting inbred lines based on specific measurable parameters (disease resistance levels, drought tolerance indices, yield components, physiological traits) that predict performance across environments. By quantifying and optimizing these parameters in the parental inbreds, the resulting hybrids inherit stable performance characteristics without requiring overly complex breeding protocols
Data Source
AI summary
A novel maize variety designated PH4D9Y and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH4D9Y with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH4D9Y through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby are provided. Hybrid maize seed, plants or plant parts are produced by crossing the variety PH4D9Y or a locus conversion of PH4D9Y with another maize variety.