Development of a highly sensitive nested RT-PCR method for Beet necrotic yellow vein virus detection.

Area of Science:

• Plant Pathology
• Molecular Biology
• Virology

Background:

• Beet necrotic yellow vein virus (BNYVV) poses a significant threat to sugar beet production worldwide.
• Accurate and sensitive diagnostic methods are essential for effective disease management and control.
• Existing diagnostic protocols may lack the sensitivity required for early or low-level detection.

Purpose of the Study:

• To develop and optimize a sensitive diagnostic test for BNYVV detection.
• To evaluate the performance of reverse-transcription polymerase chain reaction (RT-PCR) and nested polymerase chain reaction (nPCR) assays.
• To compare the sensitivity and specificity of the developed assays against existing methods.

Main Methods:

• Development of a refined one-step RT-PCR protocol using established primers.
• Implementation of a nested PCR (nPCR) approach for enhanced sensitivity.
• Testing of both assays on diverse BNYVV isolates from various geographical locations and host plants (sugar beet, Chenopodium quinoa).

Main Results:

• The optimized RT-PCR protocol maintained sensitivity and specificity without complex extraction.
• Nested PCR (nPCR) demonstrated a 1000-fold increase in sensitivity compared to standard RT-PCR.
• Both assays accurately detected various BNYVV pathotypes and isolates, showing no cross-reactivity with healthy or Beet soil-borne virus-infected samples.

Conclusions:

• The developed nPCR assay provides a highly sensitive and reliable method for BNYVV detection.
• This assay is recommended for applications requiring superior sensitivity, such as early infection detection in soil and for quarantine purposes.
• The refined RT-PCR offers a simplified, yet effective, diagnostic tool for BNYVV surveillance.