Maize Variety PH926 Backcross Conversion for Uniformity
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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 the novel maize variety PH926, which involves crossing and introgressing specific traits through backcross conversion and transformation to create hybrid seeds with improved agronomic characteristics, including resistance to various stresses and enhanced yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plant breeding is used to combine desirable traits, then resistance to diseases and insects, resistance to heat and drought, and greater yield can be achieved, but uniformity of plant characteristics such as germination, stand establishment, growth rate, maturity, plant height and ear height may be compromised
Solution Approach 1:
The patent employs backcross conversion, a segmented breeding approach where a donor parent contributing specific desirable traits is crossed with a recurrent parent, and the process is repeated for multiple generations. This segmentation allows the recurrent parent's uniform genetic background to be progressively restored while retaining the donor's desirable traits, thereby achieving both trait combination and uniformity.
Solution Approach 2:
The patent merges the desirable traits from the donor parent (resistance to diseases, insects, heat, and drought) with the uniform genetic background of the recurrent parent through controlled backcrossing. This merging process results in a maize variety that combines both the beneficial traits and the uniformity needed for consistent plant characteristics.
2Productivity
If mechanical harvesting is implemented, then crop production efficiency is improved, but uniformity of plant characteristics becomes increasingly important
Solution Approach 1:
The patent performs preliminary selection and stabilization of uniform plant characteristics during the breeding process itself, before the maize is deployed for mechanical harvesting. By establishing uniformity in germination, stand establishment, growth rate, maturity, plant height, and ear height during breedng, the variety is pre-prepared to work efficiently with mechanical harvesting systems.
3Reliability
If backcross conversion and transformation are used to introgress specific traits, then resistance to various stresses and yield can be enhanced, but the complexity of the breeding process increases
Solution Approach 1:
The patent uses a recurrent parent as an intermediary that provides a stable, uniform genetic background. This intermediary allows the complex process of trait introgression through backcross conversion to be managed systematically, where each generation is stabilized before moving to the next, thereby reducing the practical complexity despite the multi-step process.
Data Source
AI summary
A novel maize variety designated PH926 and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PH926 with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH926 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 PH926 or a trait conversion of PH926 with another maize variety. Inbred maize varieties derived from maize variety PH926, methods for producing other inbred maize varieties derived from maize variety PH926 and the inbred maize varieties and their parts derived by the use of those methods.