Maize Inbred PH25KS Breeding Segmentation
Solution Overview
Problem
Current maize breeding techniques face challenges in combining desirable traits such as disease resistance, drought tolerance, and uniformity, which are essential for efficient crop production and mechanical harvesting.
Innovation Solution
Development of a novel maize variety, PH25KS, through a breeding process involving crossing, selfing, and backcrossing to introduce specific traits, resulting in a substantially homozygous line with improved characteristics like resistance to abiotic stress, diseases, and enhanced agronomic quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plant breeding methods are used to combine desirable traits, then disease resistance and drought tolerance can be achieved, but the time to crop maturity is extended and yield uniformity is reduced
Solution Approach 1:
The breeding process is segmented into distinct generations (P, F1, F2, F3, F4, F5, F6) with specific selection objectives for each generation. This segmentation allows systematic accumulation of desirable traits while tracking genetic progress, resolving the contradiction by structuring the breeding timeline to achieve both disease resistance and timely maturity.
Solution Approach 2:
The patent applies preliminary selection actions in early generations (F1-F3) for disease resistance traits before advancing to later generations for yield uniformity selection. This preliminary action ensures disease resistance is established early, allowing subsequent generations to focus on maturity timing and uniformity without compromising disease resistance.
2Reliability
If traditional plant breeding methods are used to combine desirable traits, then drought tolerance can be achieved, but yield uniformity and plant characteristic consistency are reduced
Solution Approach 1:
Drought tolerance traits are selected and established in early to mid-generation (F2-F4) before the final inbreeding stages. This preliminary action secures drought tolerance early in the breeding process, allowing later generations (F5-F6) to concentrate exclusively on yield uniformity and plant characteristic consistency without sacrificing drought tolerance.
Solution Approach 2:
The patent applies different selection intensities and criteria to different generations and trait categories. Early generations receive intensive selection for stress tolerance (disease and drought), while later generations receive intensive selection for uniformity traits. This local quality approach resolves the contradiction by optimizing selection focus at different breeding stages.
3Manufacturing precision
If extensive backcrossing is performed to introduce specific traits, then trait precision is improved, but the breeding process complexity and time requirement increase
Solution Approach 1:
The backcrossing process is segmented into a fixed number of generations (F1-F6) with decreasing selection intensity for the introgressed trait and increasing selection for overall plant performance. This segmentation provides a practical balance between trait precision and process complexity, avoiding infinite backcrossing while achieving sufficient trait incorporation.
Solution Approach 2:
The patent performs a finite number of backcrossing generations (6 generations total) rather than attempting complete trait replacement. This partial action achieves sufficient trait precision for practical purposes while avoiding the excessive complexity and time requirements of complete genetic replacement, resolving the contradiction between precision and complexity.
Data Source
AI summary
A novel maize variety designated PH25KS and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PH25KS with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH25KS through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PH25KS or a locus conversion of PH25KS with another maize variety.