Endophytic Rhizobium Biostimulant for Low-Fertilizer Nitrogen Fixation
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Solution Overview
Problem
Existing biofertilizers face challenges due to high stress from abiotic and biotic factors, leading to reduced effectiveness and efficiency, necessitating high doses and increased farming costs, while conventional nitrogen fertilizers contribute to climate change and environmental harm.
Innovation Solution
A novel isolated endophyte strain of Rhizobium metallidurans DSM 34351, capable of penetrating plant tissue and proliferating within, combined with adjuvants to enhance survivability and efficacy, is used as a biostimulant and biofertilizer, facilitating efficient nitrogen fixation and bioprotection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional nitrogen fertilizers (ammonium nitrate, urea) are used to improve crop growth and yield, then plant nitrogen supply is improved, but CO2 emissions increase and environmental harm occurs
Solution Approach 1:
The patent replaces the mechanical/industrial Haber-Bosch ammonia production system with a biological nitrogen fixation system using endophytic bacteria. The bacteria naturally convert atmospheric nitrogen to plant-available forms through enzymatic processes, eliminating the need for energy-intensive industrial synthesis and reducing CO2 emissions associated with fertilizer production and application.
2Reliability
If biofertilizers are applied to seed or soil surface to provide nitrogen fixation, then sustainable nitrogen supply is improved, but effectiveness is reduced due to stress from abiotic factors and wash-off
Solution Approach 1:
The patent places nitrogen-fixing endophytic bacteria inside plant tissues (roots, stems, leaves) rather than on the surface. This nesting approach protects the bacteria from external stressors including temperature extremes, drought, UV radiation, and wash-off from rain, allowing them to thrive in the protected endophytic niche while continuously providing nitrogen fixation services.
Solution Approach 2:
The patent applies adjuvants before or during bacterial application to pre-condition the plant surface and facilitate bacterial penetration. These adjuvants modify surface properties temporarily to enable successful endophytic colonization before the bacteria encounter harsh environmental conditions, ensuring establishment and long-term effectiveness.
3Productivity
If high doses of biofertilizers are applied to overcome low survival rate, then nitrogen fixation capability is improved, but farming costs increase
Solution Approach 1:
By nesting bacteria inside plant tissues, the patent dramatically improves survival rates compared to surface application. The protected endophytic environment reduces mortality from environmental stress and biotic factors, meaning fewer bacterial units are needed to achieve the same nitrogen fixation output, thereby reducing product quantity requirements and associated costs.
Solution Approach 2:
The endophytic bacteria establish themselves within the plant and utilize plant-derived carbon sources and protective environments to sustain their own survival and proliferation. This self-maintenance capability reduces the need for repeated high-dose applications, lowering overall farming costs while maintaining continuous nitrogen fixation services.
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 endophyte strain, when combined with adjuvants, significantly enhances nitrogen fixation and plant growth, achieving comparable results to full synthetic fertilizer application with half the dose, reducing environmental impact and farming costs.
Implementation Method 1
Biofertilizers are made up of living microorganisms that are able to reduce atmospheric nitrogen and thus make it available to the plant in form of ammonium/ammonia or organically bound nitrogen
Data Source
AI summary
The present invention relates to a composition comprising:an isolated endophyte, wherein the endophyte is a strain of Rhizobium metallidurans, andan adjuvant and wherein the Rhizobium metallidurans strain has Accession Number DSM34351.