Novel Bacterial Strains for Soilborne Disease Suppression

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Solution Overview

Problem

Current methods for controlling soilborne plant diseases, such as those caused by Rhizoctonia solani and Pythium spp., often rely on chemical fungicides, which pose environmental and health hazards, and biological control agents provide inconsistent results, necessitating the development of more effective and reliable alternatives.

Innovation Solution

The use of biologically pure strains of bacteria, such as H24L5A and R4F2, deposited as ATCC PTA-10183 and PTA-10182, which exhibit fungicidal or fungistatic activity, combined with inert carriers and growth media, to create compositions for suppressing plant pathogens like Rhizoctonia, Pythium, and Fusarium species.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If chemical fungicides are used to control soilborne plant diseases, then disease control effectiveness is improved, but environmental and health hazards increase

Engineering Contradiction:

Improvedisease control effectivenessVSAvoidenvironmental and health hazards

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters by using naturally occurring bacterial strains (Burkholderia and Mitsuaria species) instead of synthetic chemical fungicides. This parameter change maintains disease control effectiveness while eliminating the harmful environmental and health effects associated with chemical fungicides.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the chemical mechanism of action (synthetic fungicides) with a biological mechanism (antagonistic bacteria). The beneficial bacteria compete with pathogens for resources and produce antimicrobial substances, substituting chemical control with biological control to reduce harmful effects.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If biological control agents are used to control plant diseases, then environmental safety is improved, but control consistency and reliability deteriorate

Engineering Contradiction:

Improveenvironmental safetyVSAvoidcontrol consistency

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent segments the biological control approach by selecting specific bacterial strains with known antagonistic properties against target pathogens. Instead of using generic biological agents, the invention identifies and utilizes particular Burkholderia and Mitsuaria strains that have demonstrated consistent pathogen suppression capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses specific bacterial strains as intermediaries that mediate between the environment and plant pathogens. These bacteria produce antimicrobial substances and compete for resources, providing a reliable biological control mechanism that is environmentally safe while maintaining consistent disease suppression.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If novel bacterial strains are isolated and characterized, then disease suppression capability is improved, but isolation and identification complexity increases

Engineering Contradiction:

Improvedisease suppression capabilityVSAvoidisolation and identification complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by using molecular fingerprinting techniques (16S rRNA gene sequencing, ARDRA, REP-PCR) to pre-characterize bacterial isolates before testing their pathogen suppression capabilities. This preliminary genetic characterization streamlines the identification process and ensures that only strains with relevant genetic markers are selected for further disease suppression testing.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces complex traditional isolation and identification methods with molecular biology techniques. Instead of relying on time-consuming phenotypic characterization, the invention uses DNA-based fingerprinting methods to rapidly identify and characterize bacterial strains, reducing the overall complexity and time required for strain isolation and validation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

These bacterial strains effectively reduce fungal and oomycete pathogen growth in vitro and alleviate disease symptoms in tomato and soybean seedlings, offering a consistent and environmentally friendly approach to plant disease control.

Implementation Method 1

bacteria of a strain that exhibits fungicidal or fungistatic activity

Methodology Applied

Scientific EffectFungicidal activity:

Implementation Method 2

bacteria of a strain that exhibits fungicidal or fungistatic activity

Methodology Applied

Scientific EffectFungistatic activity:

Data Source

PatentUS8404475B2Isolation of novel bacteria contributing to soilborne disease suppression

Publication Date: 2013.03.26 THE OHIO STATE UNIVERSITY RESEARCH FOUNDATION

AI summary

Embodiments relate to plant disease suppressive microorganisms and compositions including the same, methods for isolating disease suppressive microorganisms, and methods for controlling plant disease using disclosed compositions and methods.