Xanthomonas-Specific Bacteriophage Composition for Plant Disease Control
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Solution Overview
Problem
Existing methods for controlling plant diseases caused by Xanthomonas bacteria, such as copper fungicides and antibiotics, pose risks to the bacterial lawn balance and have limited host range, necessitating the development of a safer and more specific bacteriolytic agent.
Innovation Solution
Isolation of novel bacteriophages with unique genomic DNA sequences, specifically targeting Xanthomonas bacteria, and their use in compositions for plant disease control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If copper fungicides or antibiotics are used to control plant diseases caused by Xanthomonas bacteria, then the bacteriolytic ability against target bacteria is improved, but the bacterial lawn balance is disrupted and drug poisoning occurs
Solution Approach 1:
The patent converts the previously harmful approach of using broad-spectrum antibiotics and copper fungicides into a beneficial selective approach by utilizing bacteriophages that specifically target only pathogenic Xanthomonas bacteria. This transforms the harm of bacterial lawn balance disruption into benefit by preserving non-target beneficial bacteria while eliminating only the pathogenic ones.
Solution Approach 2:
The patent introduces bacteriophages as an intermediary agent between the controller and the target bacteria. Instead of directly applying chemical fungicides that affect all bacteria, the bacteriophage serves as a biological mediator that selectively infects and lyses only the desired pathogenic bacteria through specific receptor recognition, thereby avoiding direct harmful chemical interactions with the entire bacterial community.
2Reliability
If conventional phages are used to control Xanthomonas bacteria, then the bacteriolytic activity is achieved, but the host range is extremely narrow
Solution Approach 1:
The patent creates a universal bacteriolytic solution by isolating and characterizing multiple distinct bacteriophage strains (including Phage XA1 with 42,933 bp genome, Phage XA2 with 35,321 bp genome, and Phage XC1 with 43,601 bp genome) that can collectively target multiple species within the Xanthomonas genus. This multi-functional approach allows the system to adapt to different Xanthomonas pathogens while maintaining high bacteriolytic activity.
Solution Approach 2:
The patent expands the host range by varying key parameters of the bacteriophage system, including genome size (ranging from 35,321 to 43,601 bp), nucleotide sequence composition, and host specificity characteristics. By selecting and applying different phage strains with varying genomic parameters, the system achieves broader adaptability across Xanthomonas species while maintaining effective bacteriolytic activity.
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 bacteriolytic agents effectively target and lyse Xanthomonas bacteria, preventing plant diseases while maintaining ecological balance and safety for humans and plants.
Implementation Method 1
Many phages, also called bacteriolytic phages, are specifically attached to target bacteria (host) as a host, then inject their own DNA, and are self-amplified utilizing the translational mechanism of the bacteria. Furthermore, the bacteria are bacteriolyzed, and consequently, the amplified phages are diffused, and an infection into new target bacteria is repeated
Implementation Method 2
the amplified phages are diffused, and an infection into new target bacteria is repeated
Data Source
Figure 1A~1B
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Figure 3A~3B
AI summary
To control plant diseases caused by Xanthomonas bacteria, a novel bacteriophage exhibiting bacteriolytic activity specifically against Xanthomonas bacteria was isolated, and a plant disease control composition containing the bacteriophage as an active ingredient has been developed and provided. Provided are a bacteriolytic agent comprising a bacteriophage that has a novel genomic DNA sequence and exhibits bacteriolytic activity specifically against Xanthomonas bacteria, and a plant disease control composition containing the bacteriophage as an active ingredient.