Maize Northern Leaf Blight Resistance via CC-NB-LRR Polypeptides
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Solution Overview
Problem
Current methods for controlling northern leaf blight in maize, caused by the fungal pathogen Exserohilum turcicum, are either resource-intensive and environmentally detrimental, or rely on partial and race-specific resistant hybrids, which may not provide adequate protection across various environments.
Innovation Solution
The development of polynucleotide constructs encoding CC-NB-LRR polypeptides, such as those represented by SEQ ID NO: 2, which are operably linked to promoters and terminators, are used to generate maize plants with enhanced resistance to northern leaf blight by integrating these sequences into maize plant cells and regenerable maize plants, thereby conferring broad-spectrum disease resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resistant hybrids are planted to control northern leaf blight, then disease resistance is improved, but the protection is limited to partial or race-specific resistance which may not provide adequate protection across various environments
Solution Approach 1:
The patent combines multiple resistance genes (Ht1, Ht2, Ht3, and Htn1) into a single maize plant through genetic transformation. This merging of multiple genetic resistance mechanisms provides both broad-spectrum protection against different races of Exserohilum turcicum and reliable disease resistance, resolving the contradiction between reliability and adaptability.
Solution Approach 2:
The transformed maize plants exhibit multi-functional resistance by expressing multiple resistance genes simultaneously. This universal resistance mechanism protects against various races of the pathogen across different environmental conditions, making the solution adaptable to diverse situations while maintaining reliable protection.
2Reliability
If methods to reduce fungal inoculum are used to control northern leaf blight, then disease control is achieved, but additional time and resources are required and environmental detriment occurs
Solution Approach 1:
The genetically transformed maize plants possess inherent resistance to northern leaf blight through their modified genome. The plants self-protect against disease without requiring external interventions such as chemical treatments or cultural practices that would consume additional time and resources. This self-service mechanism achieves reliable disease control while eliminating the need for supplementary inputs.
3Reliability
If race-specific resistant hybrids are used, then protection against a specific race is provided, but low-level broad spectrum protection is only offered by partial resistant hybrids
Solution Approach 1:
The patent merges multiple resistance genes with different specificities (Ht1, Ht2, Ht3, Htn1) into a single transformed plant. This combination provides both high-level protection against specific races and broad-spectrum coverage against multiple races simultaneously, resolving the trade-off between protection level and spectrum of protection.
Solution Approach 2:
The transformed maize plant functions as a composite genetic system containing multiple resistance genes. This composite genetic structure integrates the specific resistance capabilities of individual genes (Ht1 against certain races, Ht2 against others, etc.) to create a unified resistance mechanism that provides both targeted and broad protection.
Data Source
AI summary
Compositions and methods for generating maize plants that exhibit resistance to northern leaf blight are provided herein. Polynucleotides encoding a polypeptide that confers resistance to northern leaf blight, polynucleotide constructs comprising such, and maize plants comprising the polynucleotide constructs are provided.