Duckweed-Based Microbial Screening for Stress Tolerance
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Solution Overview
Problem
Conventional methods for selecting beneficial microorganisms for plant growth under abiotic and biotic stresses are laborious and inefficient, often failing to isolate all necessary microorganisms, especially those that exhibit benefits only in specific microbial mixtures and are difficult to culture.
Innovation Solution
A screening method involving repeated cycles of plant growth under increasing stress conditions, with microorganisms adhering to the plants being collected and cultured in multiple media to form effective microbial mixtures, such as Bacillus pumilus and Bacillus cereus strains, for enhanced salt and hyperosmotic stress tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plate culture methods are used to isolate microorganisms from nature, then only easily culturable microorganisms can be obtained, but difficult-to-culture microorganisms are missed
Solution Approach 1:
The patent uses duckweed as an intermediary organism to bridge the gap between difficult-to-culture microorganisms and conventional culture methods. Microorganisms from natural samples are allowed to adhere to duckweed roots, which then serve as a carrier for culturing these microorganisms in liquid medium, enabling isolation of microorganisms that cannot be cultured by conventional plate methods
Solution Approach 2:
The patent replaces the mechanical plate culture system with a biological culture system using duckweed roots as support. Instead of relying on solid agar plates, the system uses living plant roots as a substrate for microorganism attachment and growth, enabling culture of microorganisms that require specific biological interactions for growth
2Reliability
If numerous microbial combinations are tested to find beneficial symbiotic mixtures, then effective microbial mixtures can be identified, but the process becomes laborious and difficult
Solution Approach 1:
The patent employs self-service by allowing microorganisms to naturally adhere to duckweed roots in a co-culture system. The duckweed-microorganism system self-organizes into beneficial associations without requiring manual combination testing, enabling identification of effective microbial mixtures through natural selection rather than exhaustive experimental testing
3Reliability
If stress conditions are applied during microorganism screening, then stress-tolerant symbiotic microorganisms can be selected, but the screening process becomes more complex
Solution Approach 1:
The patent merges multiple functions into a single screening system: the duckweed serves simultaneously as a culture substrate, stress indicator, and symbiotic partner. By combining microorganism culturing, stress tolerance testing, and symbiosis evaluation into one integrated system, the method simplifies the screening process while maintaining the ability to select for stress-tolerant symbiotic microorganisms
Data Source
AI summary
The present invention provides a screening method for selecting plant symbiotic microorganisms enabling plant growth under abiotic stress and/or biotic stress, a microbial mixture of microorganisms which are selected from nature by the method and enables a plant to grow under salinity stress and/or hyperosmotic stress in symbiosis with the plant. Specifically, the present invention provides a screening method for selecting plant symbiotic microorganisms, comprising a first screening step of allowing at least one plant to grow for a predetermined period of time while being partially soaked in a solution containing a microbial mixture under abiotic stress and/or biotic stress, and collecting microorganisms adhering to grown plant to thereby select out the microorganisms as plant symbiotic microorganisms enabling plant growth under the stress.