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Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes
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Published on: September 4, 2016

Morphological variation in Pratylenchus penetrans.

R Tarte, W F Mai

    Journal of Nematology
    |March 25, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Morphological variations in Pratylenchus penetrans, including tail terminus and stylet knobs, challenge species identification. Environmental factors significantly impact these nematode characteristics, suggesting potential conspecificity with related species.

    Keywords:
    crenate tailhost effectselective responsesmooth tailtaxonomy

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    Area of Science:

    • Plant Nematology
    • Agricultural Entomology
    • Invertebrate Morphology

    Background:

    • Accurate identification of plant-parasitic nematodes is crucial for effective pest management.
    • The genus Pratylenchus, particularly Pratylenchus penetrans, is economically significant in agriculture.
    • Morphological characters are traditionally used for species differentiation within Pratylenchus.

    Purpose of the Study:

    • To investigate the variability of morphological characters used to distinguish Pratylenchus penetrans.
    • To assess the influence of environmental factors, specifically host plants, on nematode morphology.
    • To re-evaluate the validity of current species identification criteria for Pratylenchus.

    Main Methods:

    • Analysis of morphological variability within a population derived from a single gravid female.
    • Characterization of heteromorphic features such as tail terminus shape and stylet knob morphology.
    • Rearing nematodes on various host plants (pea, cabbage, tomato, rye, beet) and callus culture to observe environmental influences.

    Main Results:

    • Significant morphological variability (heteromorphism) was observed in Pratylenchus penetrans.
    • Environmental factors, especially host plants, demonstrably altered morphometric (e.g., length, width) and qualitative (e.g., tail terminus) characters.
    • Nematodes from different geographical locations and the Cornell population also showed morphological variations.

    Conclusions:

    • The high degree of morphological variability challenges the reliability of current characters for species identification within Pratylenchus.
    • Environmental plasticity suggests that some observed variations may not represent distinct species.
    • The study raises questions about the conspecificity of certain related Pratylenchus species with Pratylenchus penetrans.