Thyrostroma carpophilum insertional mutagenesis: A step towards understanding its pathogenicity mechanism
Rovidha S Rasool1, Bilal A Padder1, Ashraf Alam Wani2
1Plant Virology and Molecular Plant Pathology Laboratory, Division of Plant Pathology, SKUAST-K, Shalimar, Srinagar 190025, India.
Journal of Microbiological Methods
|March 10, 2020
Summary
Optimizing Agrobacterium tumefaciens mediated transformation (ATMT) for Thyrostroma carpophilum aids in understanding shot hole disease. This method generated transformants with varying pathogenicity, revealing key virulence factors.
Area of Science:
- Plant Pathology
- Molecular Biology
- Mycology
Background:
- Thyrostroma carpophilum causes significant economic losses in stone fruit crops due to shot hole disease.
- Understanding the molecular mechanisms of T. carpophilum pathogenesis is crucial for developing effective disease management strategies.
Purpose of the Study:
- To optimize Agrobacterium tumefaciens mediated transformation (ATMT) conditions for T. carpophilum.
- To generate a transformant library for functional analysis of pathogenicity.
- To identify virulence factors essential for T. carpophilum disease development.
Main Methods:
- Optimization of ATMT protocol for T. carpophilum using PBIF2-EGFP construct.
- Generation of a transformant library (2050 transformants) with stable T-DNA integration confirmed by Southern blot analysis.
- Pathogenicity testing of 1005 transformants to categorize them into pathogenicity loss, reduced virulence, and wild-type categories.
Main Results:
- An optimized ATMT protocol yielded 328 positive transformants per 10^4 spores with stable T-DNA integration.
- Pathogenicity screening identified 185 transformants with complete pathogenicity loss, 35 with reduced virulence, and 785 similar to wild type.
- Analysis of infection assays revealed that pathogenicity loss correlates with impaired host penetration and sporulation, while reduced virulence is linked to failed appressorium formation.
Conclusions:
- The optimized ATMT protocol provides a robust platform for generating large-scale transformant libraries of T. carpophilum.
- This approach facilitates the identification of essential virulence factors required for shot hole disease development.
- The study lays the groundwork for future research into the molecular pathogenesis of T. carpophilum and the development of targeted disease control measures.
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