Spinach Downy Mildew Resistance Genes Locus 1
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Solution Overview
Problem
Current spinach varieties lack a single resistance gene that provides full spectrum resistance to all races of Peronospora farinosa, leading to rapid evolution of new virulent races, necessitating the development of more diverse and durable resistance mechanisms.
Innovation Solution
Introduction of novel resistance genes, such as T10, T70, T71, T72, T75, T76, T83, T89, T96, T253, T18, T133, T139, T170, and T175, which encode proteins with conserved amino acid sequences like KDHKIEKE and LSNNRNLKIL, providing broad-spectrum resistance to multiple races of Peronospora farinosa by being mapped on locus 1 of the spinach genome.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single resistance gene is used in spinach varieties, then disease resistance is provided, but the pathogen rapidly evolves new virulent races breaking down the resistance
Solution Approach 1:
The patent divides the resistance function into multiple independent resistance genes (R1, R2, R3, etc.) that recognize different pathogen effectors. Instead of relying on a single resistance gene, the plant genome is segmented to contain multiple resistance genes, each providing protection against specific pathogen races. This segmentation prevents the pathogen from evolving a single mutation that breaks all resistance simultaneously.
Solution Approach 2:
The patent creates a composite resistance system by combining multiple resistance genes with different specificities into a single plant variety. This composite approach integrates multiple genetic elements (R genes) that collectively provide broad-spectrum resistance, analogous to composite materials combining different substances to achieve superior properties. The combined effect of multiple R genes creates durable resistance that the pathogen cannot easily overcome.
2Object-affected harmful factors
If fungicides are used to control Peronospora farinosa, then disease control is achieved, but the pathogen develops immunity to the chemicals over time
Solution Approach 1:
The patent replaces the chemical control mechanism (fungicides) with a biological control mechanism (genetic resistance). Instead of using external chemical agents that the pathogen can develop immunity against, the solution is to endow the plant itself with inherent resistance through R genes. This substitution of control mechanism eliminates the arms race between fungicide efficacy and pathogen resistance development.
3Adaptability or versatility
If spinach breeding focuses on local market adaptation, then variety success in specific regions is achieved, but broad spectrum resistance to all Pfs races is limited
Solution Approach 1:
The patent creates spinach varieties with universal resistance by incorporating multiple R genes that provide broad-spectrum protection against all Peronospora farinosa races. This multi-functional resistance system allows a single variety to be effective across different regions and market segments, eliminating the need for region-specific breeding programs. The R gene combination acts as a universal solution that maintains both local adaptability and broad disease resistance.
Data Source
AI summary
The present disclosure relates to spinach plants that are resistant to downy mildew caused by Peronospora farinosa (Pfs). The present disclosure further relates to a resistance gene that confers resistance to multiple races of Pfs in spinach plants. In addition, the 5 present disclosure relates to methods for obtaining a spinach plant that is resistant to downy mildew.