Maize Inbred PH2TRF Breeding via Marker-Assisted Selection
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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 the delivery of finished seed, 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, PH2TRF, 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 stable, high-yielding maize plants with improved agronomic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional maize breeding methods are used to combine desirable traits, then stable and agronomically sound varieties are achieved, but the development process takes six to twelve years
Solution Approach 1:
The patent uses molecular markers as intermediary tools to track and select for desirable traits during breeding. These markers serve as proxies for complex traits like disease resistance and yield stability, allowing breeders to identify and combine multiple traits more rapidly through marker-assisted selection rather than traditional phenotypic selection alone.
Solution Approach 2:
The patent creates and utilizes inbred lines (such as PH2TRF and its derivatives) as standardized genetic copies that can be repeatedly crossed with different partners to generate hybrids. This copying approach allows the same proven genetic background to be tested and deployed across multiple breeding programs, accelerating variety development while maintaining stability.
2Adaptability or versatility
If multiple desirable traits are combined in a single variety, then agronomic performance is improved, but the breeding program complexity increases
Solution Approach 1:
The patent segments the breeding program into distinct modular components: developing specialized inbred lines with specific trait combinations (e.g., PH2TRF with male sterility and disease resistance), creating maintenance systems for these lines, and then combining them in controlled hybrid crosses. This segmentation allows complex multi-trait varieties to be built from simpler, well-characterized building blocks.
Solution Approach 2:
The patent develops inbred lines like PH2TRF that serve multiple functions: they provide male sterility for hybrid seed production, confer disease resistance, maintain yield stability, and can be used as parental lines in multiple different hybrid combinations. This multi-functionality reduces overall program complexity by using the same genetic material across different breeding objectives.
3Ease of manufacture
If male sterility is introduced to prevent self-pollination, then hybrid seed production is facilitated, but additional genetic manipulation steps are required
Solution Approach 1:
The patent introduces cytoplasmic male sterility (CMS) into inbred lines, which makes the plants self-sterile and automatically prevents self-pollination. This self-service mechanism eliminates the need for manual detasseling or other artificial emasculation procedures, facilitating hybrid seed production while the genetic manipulation is performed once during inbred line development rather than repeatedly during seed production.
Data Source
AI summary
A novel maize variety designated PH2TRF and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH2TRF with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH2TRF 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 PH2TRF or a locus conversion of PH2TRF with another maize variety.