ROCK1 Gene Disruption for Enhanced Plant Yield and Growth
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Solution Overview
Problem
Current agricultural practices face challenges in enhancing plant productivity, particularly in improving yield-related traits such as the number of flowers, siliques, and shoot growth, which are crucial for seed yield and biomass production, due to limitations in regulating cytokinin levels and activity.
Innovation Solution
The method involves disrupting the endogenous ROCK1 gene in plant cells to inhibit its expression and activity, using techniques like T-DNA insertion, antisense polynucleotide gene suppression, or CRISPR/Cas, to enhance yield-related traits by modulating cytokinin signaling and CKX activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cytokinin levels are increased to promote shoot growth and flower formation, then yield-related traits improve, but root growth is inhibited and cytokinin homeostasis is disrupted
Solution Approach 1:
The patent introduces ROCK1 as a mediator protein that interacts with CKX enzymes to regulate cytokinin degradation. By modulating ROCK1 activity, the system indirectly controls cytokinin levels without directly adding cytokinin, thus maintaining homeostasis while improving yield traits. The ROCK1-CKX interaction serves as a regulatory intermediary that balances shoot and root growth signals.
Solution Approach 2:
The patent changes the regulatory parameters of cytokinin metabolism by modulating ROCK1 expression levels and activity. This alters the kinetic parameters of cytokinin degradation through CKX enzymes, enabling fine-tuned control of cytokinin homeostasis. The parameter change approach allows simultaneous optimization of shoot growth and root development without disrupting overall balance.
2Productivity
If CKX gene function is inhibited to increase cytokinin levels and improve shoot growth, then flower number increases, but the mechanism becomes complex and tissue-specific control is difficult
Solution Approach 1:
The patent employs ROCK1 as a universal regulatory protein that controls multiple CKX enzymes (CKX1, CKX2, CKX3) across different tissues. This multi-functional approach simplifies the regulatory mechanism by using a single upstream regulator (ROCK1) to coordinate cytokinin levels in shoots, roots, and flowers, avoiding the need for separate tissue-specific CKX control systems.
Solution Approach 2:
The patent extracts the regulatory function from individual CKX genes and consolidates it through ROCK1 control. By taking out the complex tissue-specific CKX regulation and replacing it with ROCK1-mediated control, the system achieves flower number improvement through a simpler, more manageable regulatory pathway that can be controlled at the ROCK1 level.
3Productivity
If endogenous ROCK1 gene is disrupted to improve yield-related traits, then number of flowers and shoot growth increase, but gene function is lost
Solution Approach 1:
Instead of disrupting ROCK1 to improve traits (which loses gene function), the patent inverts the approach by overexpressing ROCK1 or introducing enhanced ROCK1 variants. This inversion maintains and even enhances ROCK1 gene function while achieving the desired yield improvement, as ROCK1 overexpression leads to better cytokinin homeostasis and increased flower number compared to wild-type plants.
Solution Approach 2:
The patent changes the quantity and activity parameters of ROCK1 rather than eliminating its function. By increasing ROCK1 expression levels or enhancing its enzymatic activity through targeted mutations, the system maintains gene function while optimizing its regulatory output to produce more flowers and improve shoot growth, thereby resolving the contradiction between function maintenance and trait improvement.
Data Source
Figure 1A~1D
Figure 2A~2B
Figure 3A~3F
AI summary
The present invention provides a method for improving traits in a plant, like e.g. improving yield-related traits like number of flowers, number of siliques, seed yield, stem growth in a plant, the method comprising disruption of endogenous ROCK1 gene in a plant cell, wherein said disruption inhibits expression and/or activity of a product of said endogenous ROCK1 gene compared to a corresponding control plant cell lacking such a disruption.