Maize Inbred PH263M Breeding for Disease Resistance and Yield
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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 yield improvement.
Innovation Solution
Development of a novel maize variety, PH263M, through a breeding process involving crossing inbred lines, self-pollination, and selection, resulting in a substantially homozygous line that can be used to produce hybrid seeds with improved traits such as resistance to abiotic stress, diseases, and enhanced yield.
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, F7, F8, F9, F10, F11) with specific selection objectives for each generation. This segmentation allows systematic accumulation of desirable traits while tracking genetic progress, resolving the contradiction between thorough trait combination and extended breeding time by structuring the process into manageable phases.
Solution Approach 2:
The patent applies preliminary action by establishing strict selection criteria and uniformity requirements at each generation before proceeding to the next. By pre-defining selection thresholds (e.g., removing plants that differ by more than 10% in plant height, ear height, or maturity), the breeding process efficiently filters out non-conforming individuals early, preventing waste of time in later generations and accelerating the path to maturity while maintaining trait reliability.
2Reliability
If traditional plant breeding methods are used to combine desirable traits, then disease resistance and drought tolerance can be achieved, but yield uniformity is reduced
Solution Approach 1:
The patent applies local quality by implementing generation-specific selection intensities and criteria. Early generations (F1-F4) focus on disease resistance and basic uniformity, while later generations (F5-F11) intensify selection for yield uniformity and agronomic quality. This localized approach to quality control at different breeding stages allows disease resistance to be established early while yield uniformity is refined progressively, resolving the contradiction between these two traits.
Solution Approach 2:
The breeding program incorporates continuous feedback through systematic evaluation of plant characteristics at each generation. Plants are measured for plant height, ear height, maturity timing, and disease resistance, and this data feeds back into selection decisions for the next generation. This feedback mechanism ensures that disease resistance is maintained while progressively improving yield uniformity, as deviations from uniformity are detected and corrected in subsequent generations.
3Productivity
If multiple generations of selection are performed to achieve uniformity, then yield and agronomic quality improve, but the breeding process complexity increases
Solution Approach 1:
The patent applies parameter changes by systematically varying selection intensity and criteria across generations. Early generations use broader selection criteria to capture disease resistance and basic uniformity, while later generations intensify selection pressure on yield-related parameters and agronomic quality. This progressive parameter adjustment allows yield to improve through multiple generations while managing complexity by focusing selection efforts on the most critical traits at each stage rather than attempting to optimize all traits simultaneously.
Data Source
AI summary
A novel maize variety designated PH263M and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PH263M with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH263M 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 PH263M or a locus conversion of PH263M with another maize variety.