Development of a Real-Time PCR Assay to Detect the Kiwifruit Pathogen Pectobacterium actinidiae

Area of Science:

• Plant Pathology
• Molecular Diagnostics
• Bacteriology

Background:

• Pectobacterium actinidiae is a significant pathogen causing kiwifruit canker.
• The pathogen is prevalent in kiwifruit-growing regions of Asia and South America.
• Accurate and rapid diagnostics are crucial for disease management and preventing spread.

Purpose of the Study:

• To develop a sensitive and fast diagnostic assay for Pectobacterium actinidiae.
• To enhance the capability for detecting P. actinidiae in plant material.
• To support phytosanitary measures for kiwifruit trade.

Main Methods:

• Development of a probe-based real-time PCR assay.
• Targeting the unique meta-pathway phenol degradation protein-like locus of P. actinidiae.
• Duplexing the assay with a plant internal control to validate DNA sample competency.

Main Results:

• The assay demonstrated high sensitivity, detecting down to 0.1 pg of genomic DNA.
• Pathogen detection limit was 10–50 colony-forming units in plant tissue.
• The assay is highly specific for Pectobacterium actinidiae.

Conclusions:

• The developed real-time PCR assay is a valuable tool for specific and sensitive detection of P. actinidiae.
• This method facilitates testing of imported/exported plant material to ensure freedom from the pathogen.
• The assay aids in preventing the introduction and spread of P. actinidiae into new areas.