Maize Variety X6K217 Backcross Conversion for Trait Stability
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Solution Overview
Problem
The challenge in maize breeding is to combine desirable traits such as resistance to diseases and insects, heat, and drought tolerance with improved yield and agronomic quality, while maintaining uniformity and stability in plant characteristics, which existing breeding methods struggle to achieve effectively.
Innovation Solution
The development of the maize variety X6K217, produced by crossing proprietary Pioneer Hi-Bred International maize inbred varieties, which incorporates specific traits through backcross conversion and transformation, allowing for the introduction of desirable genetic material and the creation of derived varieties with enhanced resistance and performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional plant breeding methods are used, then maize varieties can be developed with basic traits, but the ability to combine multiple desirable traits (disease resistance, insect resistance, heat tolerance, drought tolerance, yield) while maintaining uniformity and stability is limited
Solution Approach 1:
The patent employs backcross conversion methodology that segments the breeding process into distinct stages: initial cross between divergent inbreds to create hybrid with desired traits, then systematic backcrossing to recurrent parent to stabilize genetics. This segmentation allows combining multiple traits (disease resistance, insect resistance, heat tolerance, drought tolerance, yield) while maintaining uniformity through controlled genetic recovery.
Solution Approach 2:
The patent uses an intermediate hybrid generation as a mediator. The F1 hybrid from crossing divergent inbreds serves as an intermediary that combines desirable traits from both parents, then this hybrid is used as the recurrent parent in backcrossing. This intermediary approach enables accumulation of multiple desirable traits while progressively recovering the genetic background of the recurrent parent for uniformity and stability.
2Reliability
If backcross conversion and transformation are used to introduce desirable genetic material, then resistance and performance characteristics are enhanced, but the complexity of the breeding process increases
Solution Approach 1:
The patent applies preliminary action by first creating the F1 hybrid from crossing divergent inbreds before initiating the backcross conversion process. This preliminary hybrid generation already contains the desirable traits (disease resistance, insect resistance, heat tolerance, drought tolerance, yield) that will be subsequently stabilized through backcrossing. The transformation process is also prepared in advance with appropriate vectors and markers.
Solution Approach 2:
The patent incorporates feedback mechanisms through phenotypic selection at each backcross generation. Plants are evaluated for desired traits (resistance and performance characteristics) and selected accordingly. Molecular markers provide feedback to track the introduction of desirable genetic material and the recovery of recurrent parent background, enabling controlled progression through the complex breeding process.
Data Source
AI summary
A novel maize variety designated X6K217 and seed, plants and plant parts thereof, produced by crossing Pioneer Hi-Bred International, Inc. proprietary inbred maize varieties. Methods for producing a maize plant that comprises crossing maize variety X6K217 with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into X6K217 through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. This invention relates to the maize variety X6K217, the seed, the plant produced from the seed, and variants, mutants, and minor modifications of maize variety X6K217. This invention further relates to methods for producing maize varieties derived from maize variety X6K217 and to the maize varieties derived by the use of those methods.