Novel Detection and Quantification Approach of Erwinia amylovora In Vitro and In Planta Using SYBR Green-Based...

Area of Science:

• Plant Pathology
• Bacteriology
• Molecular Diagnostics

Background:

• Fire blight, caused by *Erwinia amylovora*, is a devastating disease affecting apple and pear trees.
• Systemic infection by *E. amylovora* leads to tree death, necessitating effective long-term orchard management strategies.
• Rapid and accurate diagnosis is critical for controlling the spread of this important plant pathogen.

Purpose of the Study:

• To develop a specific and sensitive diagnostic tool for *Erwinia amylovora*.
• To enable rapid identification and quantification of *E. amylovora* in orchard settings.
• To support timely interventions for fire blight management.

Main Methods:

• Comparative genomic analysis of various *Erwinia* species to identify unique target genes.
• Design and validation of specific primer sets targeting a single-copy hypothetical gene in *E. amylovora*.
• Development of a SYBR Green-based real-time PCR assay for pathogen detection and quantification.

Main Results:

• The developed primer set specifically amplified *E. amylovora* DNA, showing no cross-reactivity with related bacterial species like *E. pyrifoliae*, *Pectobacterium* spp., *Pantoea* spp., and *Dickeya chrysanthemi*.
• The real-time PCR assay accurately estimated the population size of *E. amylovora*.
• The novel primer set demonstrated high specificity and sensitivity for detecting *E. amylovora*.

Conclusions:

• A novel primer set targeting a specific gene enables precise detection of *Erwinia amylovora*.
• The developed SYBR Green real-time PCR assay provides a rapid and accurate method for diagnosing fire blight.
• This diagnostic tool facilitates continuous monitoring and prompt response, crucial for effective management of *E. amylovora* in orchards.