Related Experiment Video
Updated: Jun 15, 2026
11:42
Genetic Manipulation of the Plant Pathogen Ustilago maydis to Study Fungal Biology and Plant Microbe Interactions
Published on: September 30, 2016
Agrobacterium-meditated gene disruption using split-marker in Grosmannia clavigera, a mountain pine beetle associated
Ye Wang1, Scott DiGuistini, Tzu-Chu T Wang
1Department of Wood Sciences, University of British Columbia, Vancouver, BC, Canada.
Current Genetics
|March 16, 2010
Summary
Researchers developed a new gene disruption method for Grosmannia clavigera, a fungus that harms pine forests. This efficient technique, using Agrobacterium-mediated transformation, aids in understanding fungal pathogenicity and host defense mechanisms.
Area of Science:
- Mycology
- Plant Pathology
- Molecular Biology
Background:
- Grosmannia clavigera is a fungal pathogen linked to the mountain pine beetle, causing significant damage to conifer forests in western Canada.
- The fungus produces melanin, leading to discoloration of pine sapwood, impacting timber quality.
- A draft genome of G. clavigera exists, but efficient gene function analysis requires effective gene disruption methods.
Purpose of the Study:
- To develop and assess an efficient gene replacement strategy for Grosmannia clavigera.
- To facilitate functional characterization of genes involved in fungal pathogenicity and melanin biosynthesis.
- To establish a foundation for understanding how G. clavigera overcomes host defense systems.
Main Methods:
- Agrobacterium-mediated transformation was employed for gene disruption in G. clavigera.
- Linear or split-marker deletion cassettes with long flanking regions (up to 3 kb) were utilized.
- The method was validated by targeting two melanin biosynthesis genes: polyketide synthase and scytalone dehydratase.
Main Results:
- The developed gene replacement strategy achieved high homologous recombination rates, ranging from 65% to 82%.
- Mutant phenotypes (white and red/brown) were successfully generated for targeted melanin biosynthesis genes.
- This study represents the first report of using split-markers with Agrobacterium-mediated transformation for mutant generation in filamentous fungi like G. clavigera.
Conclusions:
- The reported gene disruption method is efficient for G. clavigera, enabling targeted gene replacement.
- This technique is crucial for identifying genes involved in G. clavigera pathogenicity and understanding its interaction with host trees.
- The findings pave the way for future research into fungal virulence factors and host-pathogen dynamics in forest ecosystems.
