Maize Inbred PHWNS Trait Consolidation via Backcross Conversion
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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 mechanical harvesting.
Innovation Solution
Development of a novel maize variety, PHWNS, which is homozygous and combines traits like resistance to diseases, insects, heat, and drought, with processes for making PHWNS through crossing and backcross conversion, and introduction of specific desired traits through locus conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plant breeding techniques are used to combine desirable traits, then disease resistance and drought tolerance can be achieved, but uniformity of plant characteristics deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the genetic composition parameters of the maize variety through systematic backcrossing (BC1, BC2, BC3 generations) to achieve homozygosity. This process transforms the genetic state from heterogeneous to homogeneous, ensuring uniform plant characteristics while maintaining desired traits like disease resistance and drought tolerance through selective breeding parameters
2Productivity
If multiple desirable traits are combined in a single variety, then crop productivity improves, but the complexity of breeding processes increases
Solution Approach 1:
The patent applies preliminary action by pre-selecting and incorporating multiple desirable traits (disease resistance, drought tolerance, uniformity) into the PHWNS inbred line through systematic backcrossing before hybrid development. This preliminary trait consolidation simplifies subsequent hybrid breeding processes and ensures consistent performance across multiple traits without requiring complex multi-generation selection for each trait separately
Solution Approach 2:
The patent merges multiple desirable traits (disease resistance, drought tolerance, uniformity) into a single inbred line PHWNS through backcross conversion. This consolidation allows the traits to be inherited together in hybrid combinations, achieving high crop productivity without managing separate breeding programs for each trait
3Ease of operation
If uniformity of plant characteristics is improved for mechanical harvesting, then ease of operation improves, but genetic diversity deteriorates
Solution Approach 1:
The patent applies local quality by maintaining genetic diversity at the inbred line level (PHWNS and other parental lines) while achieving uniformity in the F1 hybrid generation. Each parental inbred line retains its unique genetic characteristics and adaptability, but the hybrid offspring exhibit uniform plant characteristics (height, ear position, maturity) suitable for mechanical harvesting. This resolves the contradiction by preserving genetic diversity in the breeding population while achieving operational uniformity in the commercial hybrid
Data Source
AI summary
A novel maize variety designated PHWNS and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PHWNS with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PHWNS 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 PHWNS or a locus conversion of PHWNS with another maize variety.