ReXEG1 Gene Broad-Spectrum Phytophthora Resistance
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Solution Overview
Problem
Current methods for controlling Phytophthora diseases in crops are inadequate due to the rapid evolution of pathogens and the limited durability of resistance genes, leading to significant economic losses and environmental concerns from chemical pesticide use.
Innovation Solution
The ReXEG1 gene, derived from tobacco, is used to enhance plant disease resistance by recognizing conserved patterns in pathogens, thereby activating immune responses and reducing disease severity when overexpressed in plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If NBS-LRR disease-resistant proteins are used to recognize Phytophthora effectors, then specific resistance to Phytophthora infection is activated, but the resistance is isolate-specific and easily lost when effector molecules undergo mutations
Solution Approach 1:
The patent applies universality by developing cell membrane immunoreceptors that recognize conserved molecular patterns (PAMPs) common across multiple Phytophthora species, rather than isolates. The ReXEG1 receptor recognizes the conserved XEG1 effector structure present in P. infestans, P. capsici, and P. parasitica, providing broad-spectrum resistance that functions across different pathogen species and isolates, thereby achieving multi-functional recognition capability
2Object-affected harmful factors
If chemical pesticides are extensively applied to control Phytophthora diseases, then disease control effectiveness is improved, but serious environmental problems occur
Solution Approach 1:
The patent applies mechanics substitution by replacing chemical pesticide application with a biological resistance mechanism. The ReXEG1 gene confers natural disease resistance through cell membrane receptor-mediated recognition of pathogen effectors, substituting the mechanical/chemical control method (pesticide spraying) with a biological system that activates plant immune responses, thereby eliminating environmental pollution from chemical pesticides while maintaining effective disease control
3Reliability
If NBS-LRR resistance genes are cloned in plants, then resistance to specific Phytophthora isolates is achieved, but the resistance is quickly lost as Phytophthora isolates evolve and change composition in the field
Solution Approach 1:
The patent applies preliminary action by equipping plants with cell membrane immunoreceptors that recognize conserved molecular patterns before pathogen infection occurs. The ReXEG1 receptor is constitutively expressed in the cell membrane, maintaining a ready state that can immediately detect and respond to diverse Phytophthora effectors upon their appearance, providing long-lasting resistance that does not depend on prior exposure or pathogen-specific adaptation
Data Source
AI summary
The ReXEG1 gene for improving plant disease resistance has a nucleotide sequence as shown in SEQ ID NO. 1, and encodes a product having an amino acid sequence as shown in SEQ ID NO. 3. It has a key role in resistance of tobacco to Phytophthora pathogens. Overexpression of this gene significantly promotes the resistance of tobacco to various Phytophthora species, and is a desirable gene for enhancing the plant disease resistance. The gene is allowed to express in tobacco by genetic transformation to improve resistance to various pathogens to tobacco, thereby improving the disease resistance of crops in field.