Maize Inbred PH2DWW Breeding via Backcross Conversion
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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
A novel maize variety, PH2DWW, is developed through careful breeding and selection, incorporating traits like male sterility, disease resistance, and drought tolerance via backcross conversion and genetic transformation, allowing for the creation of stable, high-yielding hybrids with improved agronomic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding processes are used to combine desirable traits, then stable high-yielding hybrids can be developed, but the process takes six to twelve years which is too time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-establishing a recurrent parent inbred line with a comprehensive foundation of desirable traits (disease resistance, drought tolerance, yield potential) before initiating backcrossing programs. This pre-prepared genetic platform accelerates the breeding process by eliminating the need to build the foundation during each breeding cycle, thereby reducing the overall time while maintaining reliability
Solution Approach 2:
The patent uses backcrossing as an intermediary mechanism to transfer specific desirable traits from donor parents into the recurrent parent background. This intermediary approach allows for the systematic combination of multiple traits over successive generations, achieving stable high-yielding hybrids more efficiently than traditional methods while maintaining genetic stability
2Productivity
If multiple desirable traits are combined in a single variety, then agronomic performance and yield are improved, but the complexity of the breeding program increases
Solution Approach 1:
The patent applies universality by developing a recurrent parent inbred line that serves multiple functions simultaneously: it provides disease resistance, drought tolerance, yield potential, and serves as the genetic background for multiple different hybrid combinations. This multi-functional platform reduces breeding program complexity by reusing the same proven genetic base across different trait combinations and hybrid developments
Solution Approach 2:
The patent segments the breeding program into distinct phases: establishing the recurrent parent with core traits, introducing specific donor traits through backcrossing, and validating hybrid performance. This segmentation allows for systematic management of complex multi-trait combinations, making the breeding process more controllable and less chaotic
3Productivity
If backcross conversion and genetic transformation are used to introgress traits, then trait combination efficiency is improved, but the manufacturing complexity of the breeding process increases
Solution Approach 1:
The patent replaces traditional mechanical breeding methods (repeated crossing and selection) with genetic transformation techniques to introgress desirable traits. This substitution dramatically improves trait combination efficiency by directly introducing specific genes or gene clusters into the recurrent parent background, bypassing the need for numerous generations of backcrossing and selection that characterize traditional mechanical breeding approaches
Data Source
AI summary
A novel maize variety designated PH2DWW and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH2DWW with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH2DWW 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 PH2DWW or a locus conversion of PH2DWW with another maize variety.