Maize Inbred PH42D7 Breeding via Segmentation and Self-Service
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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 struggle to combine 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 PH42D7, which involves specific breeding techniques including backcross conversion, genetic manipulation, and transformation to incorporate traits like male sterility, disease resistance, and improved metabolic traits, along with processes for producing hybrid seeds through controlled pollination and tissue culture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breeding methods are used to develop new maize varieties, then desirable traits can be combined in a single variety, but the process takes six to twelve years from the first cross to delivering finished seed
Solution Approach 1:
The patent applies preliminary action by pre-establishing inbred lines with specific desirable traits (such as PH42D7 with disease resistance, drought tolerance, and improved metabolic traits) before the actual hybridization process. This preparatory work of developing standardized inbred parents with known trait profiles accelerates the overall breeding timeline while ensuring reliable trait combination in the final hybrid variety.
2Productivity
If multiple desirable traits are combined in a single maize variety, then yield and agronomic performance are improved, but the complexity of the breeding program increases
Solution Approach 1:
The patent applies segmentation by dividing the complex breeding program into separate, manageable components: developing specialized inbred lines each carrying specific desirable traits (disease resistance, drought tolerance, yield components), then combining them through controlled hybridization. This modular approach allows each trait to be optimized independently in separate inbred lines before integration, reducing overall program complexity while achieving high productivity in the final hybrid.
3Reliability
If stable, high-yielding maize varieties are developed, then agronomic soundness is improved, but the development process becomes more time-consuming
Solution Approach 1:
The patent applies self-service through the use of cytoplasmic male sterility (CMS) systems in the inbred lines. The CMS trait automatically prevents self-pollination and ensures cross-pollination occurs, eliminating the need for manual detasseling and reducing labor requirements. This self-regulating mechanism maintains genetic purity and agronomic soundness while accelerating the breeding cycle by removing time-consuming manual intervention steps.
Data Source
AI summary
A novel maize variety designated PH42D7 and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH42D7 with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH42D7 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 PH42D7 or a locus conversion of PH42D7 with another maize variety.