Detection of plant viruses in mixed infection by a macroarray-assisted method

Area of Science:

• Plant Pathology
• Molecular Biology
• Virology

Background:

• Accurate diagnosis of mixed plant viral infections is crucial for crop production.
• Existing methods may lack the sensitivity or specificity required for routine on-site diagnosis.
• Development of a reliable, field-deployable detection protocol is needed.

Purpose of the Study:

• To provide a simple, sensitive, and specific method for detecting multiple plant viruses.
• To enable reliable routine diagnosis of mixed viral infections directly at crop production sites.
• To demonstrate the utility of the method for detecting specific asparagus viruses.

Main Methods:

• RNA extraction from infected plant tissues.
• Duplex reverse transcription polymerase chain reaction (RT-PCR) to generate biotinylated cDNA probes.
• Microtube hybridization (MTH) of cDNA probes to a nylon membrane containing target viral cDNAs, followed by colorimetric visualization.

Main Results:

• The developed cDNA macroarray method demonstrated high sensitivity and specificity.
• The protocol successfully detected latent infections of Asparagus virus 1 and Asparagus virus 2 in asparagus plants.
• Visual detection of positive signals by colorimetric reaction was effective.

Conclusions:

• The described cDNA macroarray protocol is a viable tool for the sensitive and specific detection of multiple plant viruses.
• This method facilitates reliable routine diagnosis of mixed viral infections, suitable for on-site application in crop production.
• The protocol's effectiveness in detecting asparagus viruses highlights its potential for broader application in plant virus diagnostics.