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Updated: Jun 24, 2026

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Counting nematodes with a microplate reader.

A F Robinson, J A Veech, C M Heald

    Journal of Nematology
    |March 14, 2009
    PubMed
    Summary
    This summary is machine-generated.

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    This study demonstrates a fast and accurate method for counting plant-parasitic nematodes using light transmittance. The technique, utilizing an ELISA microplate reader, offers a significant improvement over traditional counting methods for nematode research.

    Area of Science:

    • Agricultural Science
    • Nematology
    • Plant Pathology

    Background:

    • Accurate quantification of plant-parasitic nematodes is crucial for understanding their impact on agriculture.
    • Traditional methods for nematode counting are often labor-intensive and time-consuming.

    Purpose of the Study:

    • To evaluate the feasibility of using light transmittance measurements with an ELISA microplate reader for quantifying plant-parasitic nematodes.
    • To compare the accuracy and efficiency of this novel method against conventional direct counting techniques.

    Main Methods:

    • Plant-parasitic nematodes (eggs and vermiform stages) were suspended in aqueous solutions.
    • Light transmittance (absorbance) was measured using an ELISA microplate reader.
    • Absorbance readings were correlated with known nematode concentrations.
    Keywords:
    Ditylenchus phyllobiusMeloidogyne incognitaRotylenchulus reniformiscountingenumerationnematodetechnique

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    Main Results:

    • A strong linear relationship (R(2) > 0.99) was observed between absorbance readings and nematode concentrations (0-10,000 nematodes/ml).
    • Coefficients of variation were acceptable, ranging from 12-23%, depending on nematode species and life stage.
    • The light transmittance method proved to be over 100 times faster than manual microscopic counting.

    Conclusions:

    • Measuring light transmittance with an ELISA microplate reader is a feasible, accurate, and rapid method for counting plant-parasitic nematodes.
    • This technique offers a significant advancement for nematode population studies, plant resistance research, and behavioral analyses.