Primers and Probe for the Detection of Maize Chlorotic Mottle Virus (MCMV)

The Need:

Efficient and accurate diagnosis of maize lethal necrosis (MLN)-causing viruses is essential for MLN surveillance programs and testing seed for zero tolerance of Maize chlorotic mottle virus (MCMV) in seed lots. To effectively manage MLN in both farmers' fields and commercial seed fields, a customized MCMV detection assay that is specific, sensitive, affordable, and portable is crucial.

The Technology:

The Reverse Transcriptase-Recombinase Polymerase Amplification (RT-RPA) is a cutting-edge technology that offers a rapid, isothermal nucleic acid amplification and detection platform. Based on the patented Recombinase Polymerase Amplification (RPA) technology, this innovative diagnostic method enables real-time endpoint analysis and field deployable detection of MCMV. The RT-RPA uses specially designed primer sets with complementary probes, targeting the MCMV genome at position 2765-2948 bp (MCMV_gp2 replicase gene), ensuring high sensitivity, specificity, and reproducibility of results.

Commercial Applications:

  • MLN Surveillance Programs: RT-RPA can be utilized in MLN surveillance programs to detect the presence of MCMV in maize fields, allowing for timely interventions and management strategies.

  • Seed Testing: Seed certification procedures can employ RT-RPA for routine MCMV testing in seed lots, ensuring that seeds are free from MCMV infection, thus enhancing the quality and productivity of crops.

  • On-Farm Testing: The portability and rapidity of RT-RPA make it suitable for on-farm testing, enabling farmers to quickly identify MCMV and take appropriate actions to protect their crops.


  • Rapid and Accurate Results: RT-RPA delivers results in just 20 minutes, providing real-time insights into MCMV presence, allowing for immediate action and preventing further spread of the virus.

  • Comparable Sensitivity: With a detection limit of 10-4, RT-RPA performs on par with RT-PCR and other molecular-based detection assays, ensuring reliable and precise results.

  • Simplified Testing Process: The assay's ability to detect MCMV directly from leaf saps without the need for nucleic acid extraction reduces complexity and saves time, making it easier to use in various testing scenarios.

  • Cost-Effective Technology: RPA is relatively inexpensive and requires minimal instrumentation, lowering the overall cost of MCMV detection, making it a practical choice for widespread application.

  • Specificity: The RT-RPA assay discriminates against other maize infecting viruses, ensuring that it is specific to detecting MCMV and avoiding potential false positives or cross-reactions.

In conclusion, the Reverse Transcriptase-Recombinase Polymerase Amplification (RT-RPA) technology offers a game-changing solution for the rapid and accurate detection of Maize chlorotic mottle virus (MCMV). Its versatility, cost-effectiveness, and portability make it an ideal tool for MLN surveillance programs, seed testing, and on-farm diagnostics, ultimately contributing to the effective management and protection of maize crops from this devastating virus.

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