Oligogalacturonide Foliar Formulation for Soybean Rust Resistance
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Solution Overview
Problem
Current chemical fungicides for controlling Asian soybean rust are becoming less effective due to resistant pathogen populations, pose health risks, and have negative environmental impacts, while oligogalacturonides (OGs) can affect plant growth and development if not applied correctly.
Innovation Solution
A method to prepare a formulation with straight chain oligogalacturonide compounds of galacturonic [1→4]-α-D-acid residues with Polymerization Degree between 3-8, using a specific enzymatic process to purify and concentrate OGs, which are applied foliarly to induce systemic resistance in plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical fungicides are used to control Asian soybean rust, then disease control efficacy is improved, but pathogen resistance develops and health/environmental risks increase
Solution Approach 1:
The patent uses oligogalacturonides as an intermediary substance that activates the plant's own immune system to resist the pathogen. Instead of directly killing the fungus with chemical fungicides, the formulation mediates the interaction by inducing the plant to produce its own defense responses, including phytoalexins, pathogenesis-related proteins, and reactive oxygen species, thereby reducing dependence on external chemical agents and associated health/environmental risks
Solution Approach 2:
The formulation enables the plant to defend itself against Asian soybean rust by activating its intrinsic immune mechanisms. The oligogalacturonides trigger the plant to self-produce defense compounds such as isoflavone phytoalexins, chitinases, glucanases, and other pathogenesis-related proteins, allowing the plant to autonomously resist pathogen infection without continuous external chemical intervention
2Reliability
If oligogalacturonides are applied to induce plant defense responses, then disease resistance is improved, but plant growth and development may be negatively affected
Solution Approach 1:
The patent applies oligogalacturonides at specific low concentrations (0.01-10 µM) that are sufficient to activate defense responses without triggering growth-inhibiting effects. This localized optimization of concentration ensures that the elicitor concentration is high enough to induce phytoalexin and pathogenesis-related protein production but low enough to avoid interfering with normal auxin-mediated growth processes
Solution Approach 2:
The patent optimizes multiple parameters including oligogalacturonide concentration (0.01-10 µM), Polymerization Degree (3-8 units), and application timing to achieve the desired balance between inducing disease resistance and maintaining normal plant growth. By precisely controlling these parameters, the formulation activates defense mechanisms while minimizing interference with growth hormone pathways
3Reliability
If high concentrations of oligogalacturonides are used to ensure disease protection, then defense response activation is improved, but plant growth inhibition increases
Solution Approach 1:
The patent establishes that optimal oligogalacturonide concentrations for inducing defense responses range from 0.01 to 10 µM, with specific embodiments using 0.1-1 µM. This precise parameter optimization ensures sufficient activation of phytoalexin and pathogenesis-related protein production while remaining below thresholds that would inhibit growth processes. The Polymerization Degree is also controlled at 3-8 units to maximize efficacy at these low concentrations
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 formulation effectively reduces soybean rust susceptibility by activating defense responses without significant growth impact, allowing fewer chemical fungicide applications and minimizing health and environmental risks.
Implementation Method 1
purifying oligogalacturonide compounds, from the product of the partial enzymatic hydrolysis of polygalacturonic acid during the pectin refining process, on which the hydrolysis reaction is conducted by a pectinase complex
Implementation Method 2
The formulation elicits a wide range of defense responses which include the accumulation of phytoalexines, glucanases and chitinases, callose deposition, of oxygen and nitric oxide reactive species
Data Source
AI summary
This invention refers to a method to prepare a formulation having as active ingredients straight chain oligogalacturonide compounds of galacturonic [1→4]-α-D-acid residues with Polymerization Degree between 3-8 units. This formulation is intended for the foliar treatment of a plant by inducing the acquired systemic resistance (ASR), decreasing its susceptibility to pathogen Phakopsora pachyrhiz, which causes the disease, commonly known as Asian rust.