Identification and Quantification of Pathogenic Pythium spp. from Soils in Eastern Washington Using Real-Time

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On-Site Molecular Detection of Soil-Borne Phytopathogens Using a Portable Real-Time PCR System
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On-Site Molecular Detection of Soil-Borne Phytopathogens Using a Portable Real-Time PCR System

Published on: February 23, 2018

K L Schroeder, P A Okubara, J T Tambong

    Phytopathology
    |October 24, 2008
    PubMed

    Insights

    This study introduces a new, accurate method for quantifying Pythium species in soil using real-time PCR and species-specific primers. This technique offers a rapid and reliable alternative to traditional methods for studying these plant pathogens.

    Area of Science:

    • * Plant Pathology
    • * Molecular Biology
    • * Soil Microbiology

    Background:

    • * Traditional methods for quantifying Pythium species, such as selective media and dilution plating, suffer from high variability.
    • * Existing methods may not accurately represent the pathogenic population of Pythium species in soil.
    • * Accurate quantification of Pythium is crucial for understanding its role in plant diseases.

    Purpose of the Study:

    • * To develop and validate a novel, accurate method for detecting and quantifying nine specific Pythium species in soil.
    • * To design species-specific primers targeting variable regions of the rDNA internal transcribed spacer for Pythium quantification.
    • * To compare the new method with traditional enumeration techniques.

    Main Methods:

    • * Design of species-specific primers for nine Pythium species based on rDNA internal transcribed spacer regions.
    • * Utilization of real-time polymerase chain reaction (PCR) with SYBR Green I for amplification detection.
    • * Generation of standard curves for each species to correlate DNA quantity with population size.
    • * Screening of 77 Pythium isolates to confirm primer specificity.

    Main Results:

    • * Development of species-specific primer pairs for Pythium abappressorium, P. attrantheridium, P. heterothallicum, P. irregulare groups I and IV, P. paroecandrum, P. rostratifingens, P. sylvaticum, and P. ultimum.
    • * Successful amplification and detection of Pythium DNA in soil samples using real-time PCR.
    • * Generation of standard curves allowed for correlation of amplified DNA with soil populations for key species.
    • * The new technique demonstrated speed and accuracy in quantifying Pythium species.

    Conclusions:

    • * A rapid and accurate real-time PCR method using species-specific primers has been established for quantifying nine Pythium species in soil.
    • * This molecular approach overcomes the limitations of traditional methods, providing more reliable enumeration of pathogenic Pythium populations.
    • * The developed technique is a valuable tool for future research on Pythium species and their impact on plant health.

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