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PCR - Polymerase Chain Reaction01:32

PCR - Polymerase Chain Reaction

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Streamlined Probe-Melt PCR for Multiplex Detection of Wheat Fungal Pathogens.

Weiwen Cui1, Robert Schmidt2, Fan-En Chen1

  • 1Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States.

Analytical Chemistry
|September 16, 2025
PubMed
Summary

A new diagnostic method accurately detects three major wheat fungal pathogens using a simplified probe-based melt curve analysis. This approach enables rapid, multiplexed identification for improved crop disease management.

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Area of Science:

  • Plant Pathology
  • Molecular Diagnostics
  • Biotechnology

Background:

  • Fungal diseases cause substantial wheat yield losses globally.
  • Current molecular diagnostic tools like PCR have limitations in specificity, cost, and multiplexing.
  • Distinguishing closely related fungal species remains a challenge for existing methods.

Purpose of the Study:

  • To develop a novel, cost-effective, and multiplexed diagnostic assay for common wheat fungal pathogens.
  • To overcome the limitations of high-resolution melt PCR and TaqMan PCR for fungal pathogen detection.
  • To enable rapid and accurate identification of *Zymoseptoria tritici*, *Puccinia triticina*, and *Puccinia striiformis f. sp. tritici*.

Main Methods:

  • Developed a simplified probe-based melt curve analysis combined with asymmetric PCR.
  • Utilized a universal primer and probe for multiplexed detection.
  • Employed distinct melting temperatures for differentiating fungal species using a single fluorescent dye.

Main Results:

  • Successfully differentiated three key wheat fungal pathogens with high specificity.
  • Achieved assay sensitivity down to 3 copies/μL.
  • Demonstrated reproducibility and ability to detect multitarget mixtures.

Conclusions:

  • The developed method offers a promising solution for rapid, accurate, and multiplexed detection of wheat fungal pathogens.
  • This approach facilitates more timely and cost-effective disease management strategies.
  • The simplified assay has the potential to significantly impact wheat crop protection.