Engineered Nitrogen-Fixing Bacteria for Non-Legume Crops
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Solution Overview
Problem
Existing technologies have not effectively addressed the challenge of enhancing nitrogen fixation in non-leguminous plants, such as wheat, rice, and maize, which is crucial for meeting the increasing global food production demands amidst environmental and economic pressures.
Innovation Solution
Introducing specific genetic variations into the nitrogen fixation or assimilation genetic regulatory network of bacteria, such as Enterobacter, to enhance their ability to fix atmospheric nitrogen in the presence of exogenous nitrogen, resulting in the production of significant amounts of fixed nitrogen in plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If genetic variations are introduced into bacteria's nitrogen fixation regulatory network, then nitrogen fixation capability is improved, but bacterial system complexity increases
Solution Approach 1:
The patent introduces genetic variations that alter parameters within the bacteria's nitrogen fixation and assimilation regulatory networks. By modifying specific genes and regulatory elements, the system changes its operational parameters to maintain nitrogen fixation activity even in the presence of exogenous nitrogen, thereby improving productivity without fundamentally redesigning the entire bacterial system.
Solution Approach 2:
The invention creates bacteria with dynamic regulatory networks that can adapt their nitrogen fixation activity based on environmental conditions. The modified regulatory network allows the bacteria to dynamically adjust between utilizing exogenous nitrogen and fixing atmospheric nitrogen, providing flexibility and improved nitrogen fixation capability under varying conditions while maintaining system adaptability rather than increasing static complexity.
2Loss of substance
If bacteria are modified to fix nitrogen in the presence of exogenous nitrogen, then supplemental nitrogen requirements are reduced, but manufacturing complexity of modified bacteria increases
Solution Approach 1:
The patent modifies specific parameters within the bacteria's genetic regulatory network, particularly in nitrogen fixation and assimilation pathways. By making targeted changes to gene expression regulation rather than complete system redesign, the manufacturing complexity is kept manageable while achieving the goal of reducing supplemental nitrogen requirements in plant cultivation.
Solution Approach 2:
The modified bacteria are designed to autonomously regulate their own nitrogen fixation activity based on environmental nitrogen levels. The self-regulating regulatory network allows the bacteria to automatically adjust their metabolism without external control, reducing the need for complex manufacturing and management interventions while minimizing supplemental nitrogen requirements.
3Productivity
If genetic variations are introduced into bacteria, then nitrogen fixation efficiency is improved, but reliability of bacterial performance may deteriorate
Solution Approach 1:
The patent introduces genetic variations that modify specific parameters in the nitrogen fixation regulatory network while maintaining overall system stability. By carefully selecting and implementing targeted genetic modifications rather than random or extensive changes, the system achieves improved nitrogen fixation efficiency while preserving reliable and consistent bacterial performance across different conditions.
Solution Approach 2:
The modified bacteria incorporate feedback mechanisms within their regulatory networks that monitor environmental nitrogen levels and adjust fixation activity accordingly. This feedback control ensures reliable and consistent performance by preventing over-fixation or malfunction, maintaining stable nitrogen fixation efficiency across varying conditions despite the introduced genetic variations.
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 modified bacteria produce 1% to 10% or more of the fixed nitrogen in plants, improving nitrogen fixation efficiency and reducing the need for supplemental nitrogen sources like fertilizers.
Implementation Method 1
Nitrogen fixation, whether accomplished chemically or biologically, requires an investment of large amounts of energy. In biological systems, an enzyme known as nitrogenase catalyzes the reaction which results in nitrogen fixation.
Data Source
AI summary
Disclosed herein are methods of increasing nitrogen fixation in a non-leguminous plant. The methods can comprise exposing the plant to a plurality of bacteria. Each member of the plurality comprises one or more genetic variations introduced into one or more genes or non-coding polynucleotides of the bacteria's nitrogen fixation or assimilation genetic regulatory network, such that the bacteria are capable of fixing atmospheric nitrogen in the presence of exogenous nitrogen. The bacteria are not intergeneric microorganisms. Additionally, the bacteria, in planta, produce 1% or more of the fixed nitrogen in the plant.