PmDR776 Molecular Marker Primer for Powdery Mildew-Resistant Wheat Breeding
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Solution Overview
Problem
The genetic diversity of powdery mildew resistance genes in major wheat cultivars is narrow, leading to weakened resistance against the disease, and there is a need to identify and utilize new resistance genes from related species like Triticum dicoccon Schrank to enhance wheat's genetic diversity and disease resistance.
Innovation Solution
A PCR-based method using the forward primer HENU654-F and reverse primer HENU654-R to amplify a molecular marker of the powdery mildew resistance gene PmDR776, allowing for accurate detection and breeding of resistant wheat varieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional chemical control methods are used to control powdery mildew, then disease control effectiveness is maintained, but safety and economic efficiency deteriorate
Solution Approach 1:
The patent replaces chemical control methods with biological control by introducing resistance genes (Pm21, Pm4b, Pm6, Pm21, Pm52) into wheat varieties. This substitution eliminates the need for chemical fungicides, thereby improving safety and economic efficiency while maintaining disease control effectiveness through genetic resistance.
Solution Approach 2:
The patent changes the fundamental parameter of disease control from external chemical application to internal genetic resistance. By modifying the genetic composition of wheat varieties to include specific resistance genes, the control mechanism shifts from reactive chemical treatment to proactive biological resistance, resolving the contradiction between effectiveness and safety/economics.
2Ease of manufacture
If a single resistance gene is used for breeding, then breeding process is simplified, but resistance capability deteriorates due to toxin emergence
Solution Approach 1:
The patent employs composite genetic resistance by combining multiple resistance genes (Pm21, Pm4b, Pm6, Pm21, Pm52) into wheat varieties. This polygenic resistance approach creates a composite defense system that prevents pathogen adaptation and toxin emergence, thereby maintaining reliable resistance capability while managing breeding complexity through systematic gene pyramiding.
Solution Approach 2:
The patent segments the resistance capability into multiple independent resistance genes, each providing specific protection against different powdery mildew strains. This segmentation allows the breeding process to systematically incorporate multiple genes through marker-assisted selection, preventing the simplification trap of single-gene breeding while maintaining manageable breeding workflows.
3Measurement precision
If molecular marker technology is applied for gene detection, then detection precision is improved, but device and process complexity increases
Solution Approach 1:
The patent uses molecular markers as intermediary elements that indirectly detect the presence of resistance genes through closely linked DNA sequences. This intermediary approach achieves high detection precision for genes like Pm21, Pm4b, Pm6, and Pm52 without requiring direct gene sequencing or complex functional assays, thereby managing detection system complexity while maintaining high precision.
Solution Approach 2:
The patent employs DNA copy-based detection methods where molecular markers serve as stable copies or proxies for the resistance genes. By detecting these marker copies through PCR and electrophoresis rather than directly analyzing the functional genes, the system achieves high detection precision with relatively simple and standardized laboratory equipment and protocols.
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
Enriches wheat's genetic diversity and enhances resistance by enabling rapid and precise selection of high-quality powdery mildew-resistant wheat varieties, reducing environmental dependence and production costs.
Implementation Method 1
A PCR-based method using the forward primer HENU654-F and reverse primer HENU654-R to amplify a molecular marker of the powdery mildew resistance gene PmDR776
Data Source
AI summary
The disclosure discloses a primer for amplifying a molecular marker of powdery mildew resistance gene PmDR776 of Triticum dicoccon Schrank, where the molecular marker primer includes a forward primer HENU654-F and a reverse primer HENU654-R; the nucleotide sequence of the forward primer HENU654-F is shown in SEQ ID NO:1, and the nucleotide sequence of the reverse primer HENU654-R is shown in SEQ ID NO:2. The molecular marker primer provided by the disclosure is applied to detection and identification of gene PmDR776 and auxiliary identification of a wheat powdery mildew resistance trait, and molecular marker-assisted selection breeding.