Artificial Rhizosphere Nitrogen Fixation via Engineered Microbial-Plant Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nitrogen fertilizer utilization efficiency in agriculture is low, leading to overuse and dependence on nitrogen fertilizers, with natural nitrogen fixation systems being limited by biological stress, low efficiency, and weak stress resistance in traditional crop roots and microorganisms.
Innovation Solution
An artificial combined rhizosphere nitrogen fixation system is developed using synthetic biology techniques, where a nitrogen-fixing and ammonium-secreting gene module is coupled with an efficient nitrogen utilization module in a plant chassis through coated seed inoculation, enhancing nitrogen fixation and utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If natural nitrogen fixation systems are used, then nitrogen fixation occurs in the rhizosphere, but nitrogen fixation efficiency is low and stress resistance is weak
Solution Approach 1:
The invention divides the nitrogen fixation system into separate functional modules: a nitrogen-fixing microbial chassis and a plant chassis with nitrogen utilization modules. These modules can be independently optimized and then combined, allowing each component to be specialized for its specific function without the constraints of a natural integrated system.
Solution Approach 2:
The invention uses synthetic biology to alter the genetic parameters of both microbial and plant chassis, creating engineered strains with enhanced nitrogen fixation and utilization capabilities. This involves modifying gene expression, metabolic pathways, and other biological parameters to achieve superior performance compared to natural systems.
2Productivity
If traditional crop roots are used, then plant growth occurs, but nitrogen utilization capacity is weak
Solution Approach 1:
The invention extracts and isolates the nitrogen fixation function from the complex natural rhizosphere system and places it in a dedicated microbial chassis. This separates the nitrogen fixation function from the plant root system, allowing each to be optimized independently - the microbial chassis for fixation efficiency and the plant chassis for utilization capacity.
Solution Approach 2:
The engineered microbial chassis is designed to perform multiple functions: nitrogen fixation, ammonium secretion, and interaction with plant roots. This multi-functional design replaces the need for complex root system adaptations while achieving enhanced nitrogen utilization through the microbial-plant symbiosis.
3Productivity
If nitrogen fertilizers are overused, then high yields are achieved, but nitrogen utilization efficiency remains low
Solution Approach 1:
The engineered microbial chassis provides autonomous nitrogen fixation and ammonium secretion functions that directly benefit the plant without requiring external nitrogen fertilizer inputs. The system self-regulates nitrogen acquisition and delivery to the plant, reducing dependence on external fertilizers while maintaining high yield potential.
Solution Approach 2:
The engineered microbial chassis acts as an intermediary between atmospheric nitrogen and the plant, converting atmospheric nitrogen into biologically fixed nitrogen and secreting ammonium that the plant can readily utilize. This intermediary function bridges the gap between available nitrogen sources and plant nitrogen utilization needs.
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 system significantly increases nitrogen fixation efficiency and plant growth, reducing fertilizer consumption and promoting yield, while overcoming the limitations of traditional methods by integrating microbial and plant genetic modifications for improved nitrogen utilization.
Implementation Method 1
a nitrogen-fixing microbial chassis and an efficient nitrogen utilization plant chassis are functionally coupled
Implementation Method 2
an amtR (encoded by a DNA sequence shown in SEQ ID NO: 2) ammonium transport module that are artificially designed
Implementation Method 3
The above two modules are functionally coupled through coated seed inoculation at a rhizosphere of a crop
Data Source
AI summary
An artificial combined rhizosphere nitrogen fixation system includes a recombinant nitrogen-fixing engineering bacterium, which is transformed with genes for encoding a nitrogen fixation activator Neb and an ammonium transporter amtR, and a recombinant plant, which is transformed with a gene for encoding an ammonium-affiliated protein Ham. The coupling of the functions of the above two is achieved through a seed-coated inoculation at a rhizosphere of a crop.