Maize Inbred PH4CTN Breeding Acceleration
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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 delivering finished seed to farmers, and existing technologies face challenges in creating stable, high-yielding varieties with desirable traits such as disease resistance, drought tolerance, and improved agronomic characteristics.
Innovation Solution
A novel maize variety, PH4CTN, is developed through careful breeding and selection, incorporating traits like male sterility, disease resistance, and drought tolerance, achieved through backcross conversion, genetic manipulation, and transformation, allowing for the creation of hybrid seeds with enhanced yield and adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breeding processes are used to develop new maize varieties, then stable and high-yielding varieties with desirable traits can be achieved, but the development time is extremely long (six to twelve years)
Solution Approach 1:
The patent applies preliminary action by developing and utilizing male-sterile inbred lines and maintaining them through specialized breeding programs before they are needed for hybrid production. The inbred line PH4CTN was developed and characterized in advance with known male-sterility traits, allowing rapid deployment into hybrid combinations without requiring time-consuming development work at the point of need. This pre-prepared germplasm repository enables breeders to quickly create new varieties while maintaining stability.
Solution Approach 2:
The patent employs copying by creating and propagating identical copies of the male-sterile inbred line PH4CTN through controlled self-pollination and maintenance programs. Multiple copies of this genetically stable line are maintained and distributed to different breeding programs, allowing simultaneous development of multiple hybrid varieties without repeating the lengthy development process. This copying approach preserves the stable genetic characteristics while enabling parallel development workflows.
2Adaptability or versatility
If multiple desirable traits are combined in a single maize variety, then yield and adaptability are improved, but the breeding process complexity increases
Solution Approach 1:
The patent applies universality by creating the inbred line PH4CTN with multiple desirable traits including male-sterility, disease resistance, and good combining ability, making it a universal parent suitable for numerous different hybrid combinations. This single inbred line can be crossed with many different male-fertile lines to produce various hybrids, each adapted to different conditions, without requiring separate development programs for each trait combination. The male-sterility trait itself serves multiple functions: preventing self-pollination, facilitating hybrid seed production, and enabling cytoplasmic male-sterility based hybrid systems.
Solution Approach 2:
The patent uses the inbred line PH4CTN as an intermediary carrier that facilitates the combination of multiple traits. Rather than directly combining multiple traits in each breeding cross, the desired traits are first consolidated into the intermediary PH4CTN line, which then serves as a common parent for producing various hybrid varieties. This intermediary approach simplifies the breeding process by separating the complex multi-trait development into two simpler stages: trait consolidation in the intermediary line, followed by hybrid production through controlled crosses.
3Manufacturing precision
If male sterility is introduced to prevent self-pollination and ensure hybrid seed production, then hybrid purity is improved, but the breeding process requires additional management steps
Solution Approach 1:
The patent applies self-service by utilizing cytoplasmic male-sterility in the PH4CTN inbred line, which automatically prevents self-pollination without requiring manual intervention. The male-sterile plants naturally produce no viable pollen, eliminating the need for labor-intensive detasseling operations that would otherwise be required to prevent self-pollination and ensure hybrid seed purity. This self-service mechanism significantly reduces the management steps and labor requirements while maintaining high hybrid seed purity.
Data Source
AI summary
A novel maize variety designated PH4CTN and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH4CTN with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH4CTN 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 PH4CTN or a locus conversion of PH4CTN with another maize variety.