NAC Gene Editing for Delayed Leaf Senescence
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Solution Overview
Problem
Current methods fail to effectively delay leaf senescence in plants, which is crucial for increasing crop yield and stress tolerance, as they do not adequately manipulate the NAC genes to extend photosynthetic periods and source strength in cereal crops.
Innovation Solution
Genetic modifications are introduced into the NAC gene locus of plants using molecular agents like CRISPR endonucleases to reduce NAC polypeptide expression or activity, thereby delaying senescence and improving agronomic traits such as yield, drought tolerance, and disease resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional methods are used to manipulate plant genes, then some basic genetic modifications can be achieved, but they fail to effectively delay leaf senescence and extend photosynthetic periods
Solution Approach 1:
The patent applies parameter changes by modifying specific genetic parameters (NAC gene sequences) to achieve delayed senescence. The invention introduces precise genetic modifications including point mutations, insertions, and deletions in NAC gene loci that fundamentally alter gene expression patterns, enabling extended photosynthetic periods and improved stress tolerance that conventional methods cannot achieve.
2Productivity
If NAC genes are modified to delay senescence, then photosynthetic period is extended and yield is improved, but genetic modification complexity increases
Solution Approach 1:
The patent applies segmentation by targeting specific functional regions within NAC genes for modification. The invention identifies and modifies specific domains (such as the DNA-binding domain, activation domain, or interaction domains) rather than attempting to modify entire genes or multiple genes simultaneously, thereby reducing the complexity of genetic engineering while achieving effective senescence delay and yield improvement.
Solution Approach 2:
The patent utilizes parameter changes by introducing specific types of genetic modifications (point mutations, insertions, deletions) at defined locations within NAC gene sequences. This approach allows precise control over gene function to extend photosynthetic period and improve crop yield without requiring complex multi-gene editing strategies.
3Reliability
If existing genetic modification approaches are used, then some agronomic traits can be improved, but stress tolerance and stay-green phenotype are insufficient
Solution Approach 1:
The patent applies universality by modifying NAC genes that play multifunctional roles in plant development and stress response. The invention targets NAC transcription factors that simultaneously control leaf senescence, stress tolerance, and photosynthetic function, thereby achieving multiple agronomic improvements (stay-green phenotype, stress tolerance, and source strength) through a single genetic modification strategy rather than requiring separate modifications for each trait.
Data Source
AI summary
Compositions and methods for editing an endogenous NAC genes in plants are provided, for the improvement of traits of agronomic or commercial importance. Modifications of expression and activity of NAC genes are described, including editing endogenous NAC gene functional motifs and knocking out NAC gene function.