Maize Gray Leaf Spot Resistance via Molecular Marker Introgression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for introgressing disease resistance into corn plants are hindered by the lack of genetic resolution in disease resistance mapping, inconsistencies in pathogen infection, and the difficulty in phenotyping due to regulatory restrictions and economic challenges in screening for gray leaf spot (GLS) resistance, particularly with the spread of multiple Cercospora species causing GLS.
Innovation Solution
A method involving crossing corn plants with specific nucleic acid sequences associated with gray leaf spot resistance, using single nucleotide polymorphisms (SNP) marker technology to screen for and select segregating populations with alleles conferring resistance, specifically targeting GLS resistance loci 1, 2, 3, and 4, and introgressing these alleles into elite germplasm to enhance disease resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional disease resistance mapping methods are used, then breeding for gray leaf spot resistance can be attempted, but genetic resolution is insufficient leading to inaccurate mapping results
Solution Approach 1:
The patent replaces traditional mechanical/phenotypic screening methods with molecular marker-based detection systems. Specific molecular markers (SNPs, SSRs, RFLPs) are used to directly detect resistance alleles at the DNA level, eliminating the need for imprecise field phenotyping and providing high-resolution genetic mapping of gray leaf spot resistance loci.
2Reliability
If field screening for gray leaf spot resistance is conducted, then resistance can be identified, but regulatory restrictions and economic challenges prevent effective screening
Solution Approach 1:
The patent introduces molecular markers as intermediary tools that mediate between the plant genome and the breeder's assessment of resistance. These markers serve as reliable proxies for resistance traits, allowing identification of resistant plants through simple DNA analysis rather than complex field inoculation and phenotyping procedures.
Solution Approach 2:
The patent substitutes field-based phenotypic screening with laboratory-based molecular marker analysis. This replacement eliminates regulatory restrictions on pathogen use and reduces economic costs associated with field trials, while maintaining or improving the reliability of resistance identification.
3Adaptability or versatility
If multiple Cercospora species are considered, then comprehensive resistance coverage is achieved, but mapping accuracy decreases due to pathogen variability
Solution Approach 1:
The patent develops molecular marker systems that can universally detect resistance alleles across multiple Cercospora species. The markers are designed to identify conserved resistance loci that provide broad-spectrum resistance, enabling a single marker system to function across diverse pathogen races and species without sacrificing mapping precision.
Data Source
AI summary
The present invention is in the field of plant breeding and disease resistance. More specifically, the invention includes a method for breeding corn plants containing quantitative trait loci that are associated with resistance to gray leaf spot, a fungal disease associated with Cercospora spp. The invention further includes germplasm and the use of germplasm containing quantitative trait loci (QTL) conferring disease resistance for introgression into elite germplasm in a breeding program for resistance to gray leaf spot.