Soybean Rpp4 Allele Marker-Assisted Breeding for Rust Resistance
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Solution Overview
Problem
Soybean plants lack resistance to Asian Soybean Rust, a rapidly spreading fungal disease caused by Phakopsora pachyrhizi, with commercial germplasm and current disease-resistant cultivars insufficient in providing protection, necessitating the development of new resistance genes for effective yield preservation.
Innovation Solution
Identification and utilization of genetic markers associated with the Rpp4 resistance allele, specifically a G at nucleotide 59 of SEQ ID NO:1, to select and produce soybean plants with enhanced resistance to Asian Soybean Rust through marker-assisted breeding and introgression of the Rpp4 resistance allele into soybean germplasm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional breeding methods are used to develop disease-resistant soybean cultivars, then resistance to Asian Soybean Rust can be improved, but the process is time-consuming and lacks precision in selecting resistant plants
Solution Approach 1:
The patent applies preliminary action by developing and utilizing molecular markers (specifically SNPs) that are预先 identified and linked to the Rpp4 resistance allele. These markers allow breeders to screen for resistance before phenotypic expression occurs, enabling early selection of resistant plants in the breeding process and significantly reducing the time required to develop resistant cultivars
Solution Approach 2:
The patent replaces traditional mechanical/phenotypic selection methods with molecular marker-assisted selection. Instead of visually identifying resistant plants after disease exposure, the invention uses DNA-based marker detection to identify plants carrying the Rpp4 allele, substituting biochemical analysis for phenotypic observation and accelerating the breeding process
2Adaptability or versatility
If commercial germplasm is used, then breeding programs can proceed with available varieties, but these lack resistance to Asian Soybean Rust
Solution Approach 1:
The patent uses molecular markers as an intermediary between the Rpp4 resistance gene and the breeding selection process. The markers serve as detectable indicators that allow breeders to track and select for the resistance allele even when it is not yet phenotypically expressed, enabling the integration of resistance into commercial germplasm while maintaining breeding program flexibility
Solution Approach 2:
The invention enables preliminary identification of resistance alleles in germplasm before breeding operations begin. By using markers to pre-screen germplasm for the Rpp4 allele, breeders can make informed decisions about which varieties to use as parents, ensuring that resistance is incorporated into breeding programs from the outset rather than added later
3Reliability
If fungicide applications are used to prevent yield loss, then disease protection can be achieved, but this increases production costs and does not provide long-term resistance
Solution Approach 1:
The patent applies preliminary action by incorporating disease resistance genetically into soybean cultivars before planting. The Rpp4 allele provides constitutive or inducible resistance that is already present in the plant, eliminating or reducing the need for subsequent fungicide applications and providing long-term protection without increasing chemical usage
Solution Approach 2:
The invention enables the plant to provide its own disease protection through the Rpp4 resistance gene. The resistant cultivars possess inherent immunity to Asian Soybean Rust, allowing them to protect themselves without external intervention from fungicides, thereby reducing production costs and chemical dependency
Data Source
AI summary
The present invention relates to methods and compositions for identifying, selecting and/or producing a soybean plant or germplasm having a Rpp4 resistance allele and resistance to Phakosora pachyrhizi. A soybean plant, part thereof and/or germplasm that has been identified, selected and/or produced by any of the methods of the present invention is also provided. Also provided are single nucleotide polymorphisms (SNPs) associated with resistance to pathogens; and compositions including amplification primer pairs capable of initiating DNA polymerization by a DNA polymerase on soybean nucleic acid templates to generate soybean marker amplicons.