Maize Inbred PH25RN Breeding Cycle Reduction
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Solution Overview
Problem
The development of new maize varieties is a time-consuming process that takes six to twelve years, and there is a continuous need for stable, high-yielding maize varieties with improved traits such as disease resistance, drought tolerance, and better agronomic characteristics.
Innovation Solution
A novel maize variety, PH25RN, 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 maize seeds with enhanced characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breeding methods are used to develop new maize varieties, then the varieties can be stable and high-yielding, but the development process takes six to twelve years
Solution Approach 1:
The patent applies preliminary action by creating inbred lines through multiple generations of self-pollination before the actual hybrid development. This preliminary inbreeding process (PH25RN x PH25RN for 6 generations) establishes genetically stable lines that can be quickly combined later, reducing the overall breeding cycle time while maintaining variety stability.
Solution Approach 2:
The breeding program is segmented into distinct phases: creating inbred lines (PH25RN), developing hybrids (PH25RN x other inbreds), and producing F1 seeds. This segmentation allows each phase to be optimized independently, with the inbred line development completed separately from the hybrid development, thereby reducing total time.
2Adaptability or versatility
If multiple desirable traits are combined in a single variety, then the variety becomes more versatile and productive, but the breeding complexity increases
Solution Approach 1:
The patent merges multiple desirable traits into the PH25RN inbred line through systematic self-pollination and selection over six generations. Traits such as disease resistance, drought tolerance, and agronomic characteristics are combined in this single inbred line, which then serves as the basis for multiple hybrid varieties, reducing the need for separate breeding programs for each trait combination.
Solution Approach 2:
The PH25RN inbred line serves as a universal parent line that can be crossed with multiple other inbred lines to produce different hybrid varieties. This multi-functional inbred line can contribute different trait combinations depending on which partner line is used, thereby reducing the overall complexity of the breeding program by creating one versatile component rather than multiple specialized ones.
3Stability of the object's composition
If inbred seed is produced through self-pollination, then the seed forms an essentially homogeneous population, but the process requires multiple generations
Solution Approach 1:
The patent performs preliminary self-pollination for exactly six generations (PH25RN x PH25RN) to achieve sufficient homozygosity and genetic stability in the inbred line. This preliminary action establishes the homogeneous population required for commercial use, and the six-generation duration is optimized to achieve the desired homogeneity without unnecessary additional generations.
Data Source
AI summary
A novel maize variety designated PH25RN and seed, plants and plant parts thereof are provided. Methods for producing a maize plant comprise crossing maize variety PH25RN with another maize plant are provided. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH25RN 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 PH25RN or a locus conversion of PH25RN with another maize variety.