Maize PH429H 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, 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 PH429H, which involves crossing with other maize plants to introduce traits like male sterility, disease resistance, and improved agronomic characteristics through backcross conversion, genetic manipulation, and transformation, along with specific breeding practices to produce hybrid seeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding methods are used to combine desirable traits, then the resulting varieties have stable and agronomically sound characteristics, but the development process takes six to twelve years
Solution Approach 1:
The breeding program is divided into distinct phases: initial cross to combine traits, followed by systematic backcrossing to the recurrent parent. This segmentation allows trait combination and background recovery to occur in separate, manageable steps, reducing overall development time while maintaining variety stability.
Solution Approach 2:
The recurrent parent is selected in advance with most desired traits already present, and the breeding program is designed to recover this background through predetermined backcrossing generations. This preliminary preparation accelerates the process by eliminating the need to develop the recurrent parent background during the breeding process.
2Adaptability or versatility
If multiple desirable traits are combined in a single variety, then the variety achieves high yield and environmental stress tolerance, but the breeding process becomes more complex and time-consuming
Solution Approach 1:
The recurrent parent serves as an intermediary that carries most desired traits and provides the genetic background for the final variety. By using this intermediary, the breeder can introduce additional traits through a single cross and then systematically recover the recurrent parent background through backcrossing, simplifying the overall process of combining multiple traits.
Solution Approach 2:
The breeding program focuses on introducing specific desired traits from the non-recurrent parent into the recurrent parent background through targeted backcrossing. This allows different parts of the genome to have different origins - the recurrent parent contributes the stable background and most traits, while the non-recurrent parent contributes specific desired traits, achieving trait combination without excessive complexity.
3Reliability
If traditional breeding methods are used, then the variety maintains agronomic soundness, but the time from first cross to seed delivery extends to six to twelve years
Solution Approach 1:
The backcrossing process is designed as a continuous sequence of generations (BC1, BC2, BC3, etc.) where each generation systematically recovers the recurrent parent background while retaining desired traits. This continuous action accelerates background recovery compared to traditional methods that may involve longer intervals between crosses or less systematic approaches.
Solution Approach 2:
The breeding program changes the parameter of backcrossing frequency and generation number to optimize the balance between background recovery and trait retention. By adjusting these parameters, the program achieves agronomic soundness through sufficient backcrossing while reducing overall development time through efficient progression through backcross generations.
Data Source
AI summary
A novel maize variety designated PH429H and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH429H with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH429H 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 PH429H or a locus conversion of PH429H with another maize variety.