Guided Microbial Remodeling for Nitrogen Fixation in Crops
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Solution Overview
Problem
Current agricultural practices are inefficient and environmentally detrimental due to reliance on the Haber-Bosch process for nitrogen fertilizer production, leading to significant resource consumption and environmental pollution, with only a small fraction of applied nitrogen being utilized by crops.
Innovation Solution
A guided microbial remodeling (GMR) method to enhance plant-associated microbes by introducing targeted genetic variations, improving their ability to perform nitrogen fixation and colonization, using non-intergeneric genetic modifications to create microbes that can efficiently fix nitrogen in non-leguminous crops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nitrogen fertilizer is applied to meet growing food demand, then crop productivity is improved, but environmental pollution and resource waste increase due to fertilizer loss
Solution Approach 1:
The patent develops microbes that can independently fix atmospheric nitrogen and deliver it to plants without requiring synthetic fertilizer application. The microbial systems autonomously perform nitrogen fixation, conversion, and delivery functions that would otherwise require external chemical inputs, thereby eliminating the harmful environmental effects of fertilizer production and application while maintaining crop productivity
Solution Approach 2:
The patent uses engineered microbes as intermediary organisms to convert atmospheric nitrogen into plant-available forms. These microbial intermediaries facilitate nitrogen transfer from the atmosphere to crops, replacing the direct application of synthetic fertilizers and thereby reducing environmental pollution associated with fertilizer production, application, and loss
2Quantity of substance
If Haber-Bosch process is used to produce nitrogen fertilizer, then nitrogen supply for crops is ensured, but resource consumption and environmental damage increase
Solution Approach 1:
The patent replaces the mechanical-chemical Haber-Bosch process with a biological nitrogen fixation system. Instead of using high-pressure reactors, metal catalysts, and immense energy inputs, the invention employs microbial enzymes (nitrogenase) that naturally fix atmospheric nitrogen under ambient conditions, thereby eliminating the resource-intensive industrial process while ensuring adequate nitrogen supply for crops
Solution Approach 2:
The patent changes the operational parameters of nitrogen fixation from industrial conditions (high temperature, high pressure, synthetic catalysts) to biological conditions (ambient temperature, ambient pressure, enzymatic catalysts). This parameter transformation enables nitrogen fixation to occur under sustainable conditions while maintaining effective nitrogen supply for plant growth
3Quantity of substance
If chemical nitrogen fertilizer is applied, then nitrogen availability to plants is increased, but utilization efficiency decreases due to degradation and loss
Solution Approach 1:
The patent employs microbes as living intermediaries that not only fix nitrogen but also actively deliver it to plant roots and regulate its release. These microbial carriers protect the nitrogen from degradation and loss mechanisms that affect chemical fertilizers (rain, runoff, volatilization), thereby improving both nitrogen availability to plants and overall utilization efficiency
Solution Approach 2:
The patent develops microbial systems that can sense plant nitrogen needs and regulate nitrogen fixation and delivery accordingly. The microbes respond to plant signals and environmental conditions, adjusting their nitrogen production and delivery rates to match actual crop requirements, thereby maximizing nitrogen utilization efficiency and minimizing losses
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The GMR method enhances microbial nitrogen fixation efficiency, reducing the need for synthetic fertilizers, improving crop yields, and minimizing environmental impact by optimizing microbial functions for plant benefit.
Implementation Method 1
These systems utilize an enzyme called nitrogenase that catalyzes the reaction between N2 and H2, and results in nitrogen fixation.
Data Source
AI summary
The present disclosure provides guided microbial remodeling (GMR) methods for the rational improvement of plant-associated microbes to perform plant-beneficial functions. The GMR methods described herein allow for non-intergeneric genetic optimization of key regulatory networks within the microbes, which improve plant-beneficial functions over wild-type microbes but don't have the risks associated with transgenic approaches (e.g., unpredictable gene function, public and regulatory concerns, etc.). The present disclosure also provides remodeled microbes and compositions thereof. The utilization of remodeled microbes and compositions thereof will enable farmers to realize more productive and predictable crop yields without the nutrient degradation, leaching, or toxic runoff associated with traditional synthetically derived fertilizers.