Soybean Phytophthora Resistance Locus Identification
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Solution Overview
Problem
Current strategies for managing Phytophthora root and stem rot (PRSR) in soybean plants, relying on race-specific resistant cultivars, face limitations due to the rapid evolution of the pathogen, making long-term resistance challenging and necessitating the identification of novel resistance genes.
Innovation Solution
Identification of a novel Phytophthora resistance locus on chromosome 7 and linked markers, including SSR, InDel, and SNP markers, which can be used for genotyping to support breeding programs, enabling early selection and rapid commercialization of resistant soybean varieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If race-specific resistant soybean cultivars are deployed, then soybean yield losses from Phytophthora disease are reduced, but the effectiveness is limited to 8-15 years due to pathogen evolution
Solution Approach 1:
The patent applies preliminary action by developing marker-assisted selection methods that enable early identification of plants carrying novel Rps genes before pathogen adaptation occurs. This allows breeders to pre-deploy resistant cultivars with known durability, staying ahead of pathogen evolution rather than reacting to it after resistance breakdown.
Solution Approach 2:
The patent changes the genetic parameter by introducing novel Rps genes (such as Rps11 on chromosome 7) that have not been previously deployed. This genetic parameter change creates new resistance mechanisms that the evolving pathogen population has not yet adapted to, extending the effective duration of resistance.
2Reliability
If known Rps genes are pyramided into a single cultivar, then resistance is enhanced, but the strategy is not effective long-term because recombining pathogen populations create new virulence combinations as rapidly as breeders can stack resistance genes
Solution Approach 1:
The patent enables preliminary identification of plants carrying desired Rps gene combinations through marker-assisted selection, allowing breeders to efficiently pyramid multiple resistance genes without losing track of recombination events. This accelerates the breeding process relative to pathogen evolution.
Solution Approach 2:
The patent implements feedback through molecular marker systems that continuously monitor the presence and combination of Rps genes in breeding populations. This feedback mechanism allows breeders to track and maintain effective gene pyramids, ensuring that resistance stacking keeps pace with pathogen evolution.
3Reliability
If traditional breeding methods are used to identify resistant plants, then resistant varieties can be developed, but the process is time-consuming and costly
Solution Approach 1:
The patent replaces mechanical/phenotypic selection methods with molecular marker-based detection systems. Instead of growing and evaluating plants for resistance phenotypes in the field (time-consuming and environment-dependent), breeders use DNA markers to directly detect the presence of Rps genes, dramatically reducing breeding cycle time and cost.
Solution Approach 2:
The patent introduces molecular markers as intermediaries between the Rps genes and the selection process. These markers serve as reliable proxies that indicate the presence of resistance genes without requiring actual pathogen challenge or phenotypic expression, enabling rapid and accurate selection.
Data Source
AI summary
The present subject matter relates to methods and compositions for identifying soybean plants that having increased Phytophthora root and stem rot resistance. The methods use molecular markers to identify and to select plants with increased Phytophthora root and stem rot resistance or to identify and deselect plants with decreased Phytophthora root and stem rot resistance. Soybean plants generated by the methods disclosed are also a feature of the present subject matter.