SCN Resistance Introgression in Soybean via Marker Selection

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Solution Overview

Problem

Current methods for breeding soybeans resistant to soybean cyst nematode (SCN) are challenging due to the complex and polygenic nature of resistance, which is often race-specific and unstable over time, and existing control measures like crop rotation and nematocides are either impractical or environmentally unsound.

Innovation Solution

The development of methods to detect SCN resistance in plants by measuring gene expression levels, using agents that modify DNA methylation, and introducing specific nucleic acid sequences to introgress SCN resistance loci into soybean germplasm, allowing for marker-assisted selection and generation of SCN-resistant soybean plants with additional agronomic traits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional breeding methods are used to develop SCN resistant soybean varieties, then resistance can be achieved, but the process is time-consuming and difficult due to the complex and polygenic nature of resistance

Engineering Contradiction:

ImproveSCN resistanceVSAvoidbreeding time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces conventional mechanical breeding methods with molecular marker-based selection systems. Specific nucleic acid markers linked to SCN resistance QTLs are used to identify and select resistant plants at the molecular level, eliminating the need for time-consuming field trials and phenotypic evaluation across multiple generations.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces molecular markers as intermediaries that link observable phenotypes (SCN resistance) with underlying genotypes. These markers serve as proxies that allow breeders to select for resistance traits without direct phenotypic assessment, accelerating the breeding process while maintaining reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If existing SCN resistant varieties are used, then resistance to specific SCN races can be achieved, but the resistance is race-specific and does not provide stability over time due to changing SCN populations

Engineering Contradiction:

Improverace-specific resistanceVSAvoidbroad-spectrum resistance stability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent segments the SCN resistance trait into multiple independent QTLs (quantitative trait loci) located at different genomic positions. By identifying and selecting for multiple distinct markers associated with different QTLs, the system enables stacking of multiple resistance genes, creating varieties with broad-spectrum resistance that remains stable against evolving SCN populations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines multiple resistance QTLs from different sources into composite resistant varieties. By integrating markers and resistance genes from multiple parental lines, the system creates genetically diverse resistant varieties that exhibit enhanced adaptability and stability across varying SCN race compositions.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If SCN resistant soybean varieties are grown, then yield loss from SCN can be reduced, but resistant varieties often carry a significant yield penalty when grown in the absence of SCN

Engineering Contradiction:

ImproveSCN yield lossVSAvoidyield in absence of SCN

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent applies marker-assisted selection to introgress only the specific portions of donor parent genomes containing SCN resistance QTLs into elite breeding lines, rather than transferring entire resistant varieties. This partial action approach minimizes linkage drag and unwanted genetic effects while maintaining resistance, thereby reducing yield penalty.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The patent applies local quality by precisely targeting and transferring only the specific genomic regions containing SCN resistance QTLs to specific locations in the elite background. This localized introgression ensures that resistance traits are introduced without compromising the overall agronomic quality and yield potential of the elite parent.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables reliable and predictable introgression of SCN resistance into non-resistant soybean germplasm, providing stable resistance across various SCN races and improving yield and agronomic traits while reducing environmental impact.

Implementation Method 1

using agents that modify DNA methylation

Methodology Applied

Scientific EffectDNA methylation:

Data Source

PatentUS10457956B2SCN plants and methods for making the same

Publication Date: 2019.10.29 UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION

AI summary

The invention relates to genes which may be utilized for resistance to soybean cyst nematode. More specifically the present disclosure relates to identification of gene(s) that can confer upon a soybean plant resistance to soybean cyst nematode (SCN) and methods to use these loci and genes to obtain soybean strains that are resistant to SCN.