Natural Microbial Barcode Assays for Plant Root Colonization
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Solution Overview
Problem
Current agricultural practices are inefficient in nitrogen fixation and delivery, leading to high environmental impact and resource wastage, with modern row crop agriculture heavily reliant on the resource-intensive and environmentally deleterious Haber-Bosch process, and nitrogen fertilizer utilization by crops is inefficient, resulting in significant losses before harvest.
Innovation Solution
A method of barcoding host cells by inserting a native barcode polynucleotide cassette comprising forward and reverse primer binding sites and a barcode sequence into the genome of bacterial cells, enabling efficient nitrogen fixation and colonization of non-leguminous crops, using non-intergeneric remodeled bacteria capable of fixing atmospheric nitrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the Haber-Bosch process is used to produce nitrogen fertilizer, then nitrogen fertilizer can be produced to meet crop demands, but resource consumption increases and environmental damage occurs
Solution Approach 1:
The patent utilizes naturally occurring diazotrophic bacteria that can autonomously fix atmospheric nitrogen into plant-usable forms. These bacteria serve themselves by obtaining energy from plant exudates and converting atmospheric nitrogen, eliminating the need for external synthetic fertilizer production and application infrastructure.
Solution Approach 2:
The patent replaces the mechanical-industrial Haber-Bosch process with a biological system. Instead of using high-pressure reactors, metal catalysts, and energy-intensive machinery to fix nitrogen, the system employs living bacteria that naturally perform nitrogen fixation through enzymatic processes in the rhizosphere.
2Quantity of substance
If heavy machinery is used to apply nitrogen fertilizer, then fertilizer can be delivered to fields, but energy consumption increases and soil compaction occurs
Solution Approach 1:
The nitrogen-fixing bacteria are applied as a biological product that self-propagates and self-delivers nitrogen fixation services to the crop throughout the growing season. No additional energy input is required for fertilizer application after the initial bacterial inoculation.
Solution Approach 2:
The bacteria are applied to the soil or seed before the growing season begins, allowing them to establish populations in advance. Once established, they continuously provide nitrogen fixation services throughout the crop growth cycle without requiring repeated applications or energy-intensive delivery operations.
3Quantity of substance
If chemical nitrogen fertilizer is applied to crops, then nitrogen supply increases, but fertilizer loss before crop utilization increases
Solution Approach 1:
The bacteria continuously fix atmospheric nitrogen directly in the rhizosphere where the crop roots are located, delivering nitrogen in small, frequent amounts that match crop uptake demands. This eliminates the losses associated with bulk fertilizer application, including volatilization, runoff, and denitrification that occur when large amounts of chemical fertilizer are applied all at once.
Solution Approach 2:
The bacteria act as a living intermediary between atmospheric nitrogen and the crop plant. They convert atmospheric nitrogen into ammonium and other plant-usable forms directly at the root surface, ensuring that nitrogen is delivered in a form and location that the crop can immediately utilize, minimizing losses to the environment.
4Measurement precision
If natural microbial barcodes are used for screening bacteria, then detection precision improves, but the complexity of analyzing mixed samples increases
Solution Approach 1:
The patent uses highly specific natural barcode sequences that provide unambiguous identification of individual bacterial strains. This high degree of specificity allows for precise tracking and quantification of each strain in mixed populations, enabling researchers to distinguish between closely related strains and accurately measure their relative abundances and colonization efficiencies.
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
Enhances nitrogen fixation and delivery to non-leguminous crops, reducing environmental impact and fertilizer waste, and allows for efficient detection and screening of nitrogen-fixing bacteria in mixed samples.
Implementation Method 1
These systems utilize an enzyme called nitrogenase that catalyzes the reaction between N2 and H2, and results in nitrogen fixation.
Implementation Method 2
A method of barcoding host cells by inserting a native barcode polynucleotide cassette comprising forward and reverse primer binding sites and a barcode sequence into the genome of bacterial cells
Data Source
AI summary
The present disclosure is drawn to methods of utilizing nucleic acid barcodes and corresponding amplifying sites in cells in which the barcodes naturally occur. These barcodes and amplifying sites are reconfigured into a single nucleic acid cassette that provides for ease of use in tagging particular species, strains, or variants of cells, each with a different barcode. These barcodes can be used to track the colonization capabilities of the barcoded cells. The present disclosure further provides for assays that utilize natural barcodes to measure relative microbial colonization ability of a plant root system.