Maize Inbred PH47WJ Breeding via Segmentation and Extraction
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Solution Overview
Problem
The development of new maize varieties and hybrids is a time-consuming process, taking six to twelve years from the first cross to delivering finished seed to farmers, 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 PH47WJ, which involves crossing with other maize plants to introduce desired traits through backcross conversion, genetic manipulation, and transformation, including cytoplasmic or nuclear factors for male sterility and herbicide tolerance, insect resistance, and other desirable characteristics, to create stable and high-yielding hybrids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding processes are used to combine desirable traits, then stable and agronomically sound varieties are developed, but the process takes six to twelve years which is time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-establishing inbred lines with specific desirable traits (disease resistance, drought tolerance, yield potential) before the actual hybrid development process. This preparatory work organizes the genetic material in advance, allowing faster combination of traits when needed, thus reducing the overall breeding timeline while maintaining variety stability
2Adaptability or versatility
If multiple desirable traits are combined in a single variety, then yield and stress resistance are improved, but the breeding process becomes more complex
Solution Approach 1:
The patent segments the breeding process into distinct phases: developing individual inbred lines with specific traits, evaluating them separately, and then combining them through controlled crosses. This segmentation allows each trait to be optimized independently in its own inbred line, then combined systematically, reducing overall process complexity while achieving multi-trait varieties
Solution Approach 2:
The patent applies local quality by creating inbred lines that are specialized for specific functions (e.g., one line for disease resistance, another for drought tolerance, another for yield). Each inbred line has optimized local traits, and the final hybrid combines these specialized lines, allowing complex trait combinations without proportionally increasing breeding complexity
3Reliability
If inbred lines are used as parents, then hybrid vigor and stable traits are achieved, but self-pollination must be prevented which requires additional mechanisms
Solution Approach 1:
The patent extracts the male reproductive capability from the inbred lines by using cytoplasmic male sterility (CMS). The female parent line is genetically modified to be male sterile, completely removing self-pollination capability. This extraction eliminates the need for manual detasseling while ensuring complete reliance on cross-pollination, maintaining trait stability without adding operational complexity
Solution Approach 2:
The patent introduces cytoplasmic male sterility as an intermediary mechanism that naturally prevents self-pollination. This biological intermediary (the CMS trait) acts as an automatic pollination control system, mediating between the inbred line genetics and the hybridization process, thereby maintaining trait stability without requiring additional manual pollination control measures
Data Source
AI summary
A novel maize variety designated PH47WJ and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH47WJ with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH47WJ 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 PH47WJ or a locus conversion of PH47WJ with another maize variety.