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Updated: Jun 24, 2026

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Published on: December 11, 2012

Host Response to Meloidodera spp. (Heteroderidae).

M Mundo-Ocampo, J G Baldwin

    Journal of Nematology
    |March 20, 2009
    PubMed
    Summary
    This summary is machine-generated.

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    Body Wall Fine Structure of the Anterior Region of Meloidogyne incognita and Heterodera glycines Males.

    Journal of nematology·2009

    Plant-parasitic nematodes Meloidodera floridensis, M. charis, and M. belli induce single giant cells in host plants. These giant cells exhibit unique structural features and organelle content, aiding in nematode-plant interaction studies.

    Area of Science:

    • Plant Pathology
    • Nematology
    • Cell Biology

    Background:

    • Plant-parasitic nematodes are significant agricultural pests.
    • Understanding nematode-induced host cell modifications is crucial for developing control strategies.
    • The genus Meloidodera induces unique host responses compared to other Heteroderidae.

    Purpose of the Study:

    • To investigate and compare the host responses of loblolly pine, peony, and sage to Meloidodera floridensis, M. charis, and M. belli.
    • To characterize the cellular and subcellular structures of nematode-induced giant cells using advanced microscopy techniques.
    • To evaluate the phylogenetic implications of giant cell formation within the Heteroderidae family.

    Main Methods:

    • Light, scanning, and transmission electron microscopy were employed.
    Keywords:
    Heteroderoidaecallosegiant cellhistopathologyplasmodesmatawall ingrowths

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  • Detailed ultrastructural analysis of giant cells and surrounding host tissues was performed.
  • Comparative analysis of giant cell morphology and organelle content across different Meloidodera species and host plants.

    • Main Results:

    • All three Meloidodera species induced a single, uninucleate giant cell originating from the pericycle.
    • Giant cell wall thickness varied, being thickest near the nematode's lip region, with numerous plasmodesmata but no wall ingrowths.
    • Nuclear morphology differed: M. floridensis induced irregular nuclei, while M. charis and M. belli induced clustered nuclear units.
    • Organelles within giant cells were typical for Heteroderidae, suggesting conserved cellular responses.

    Conclusions:

    • Meloidodera species consistently induce uninucleate giant cells, distinct from the syncytia formed by Heterodera.
    • The observed structural variations in giant cells may offer insights into nematode phylogeny within Heteroderidae.
    • Further research incorporating additional characters is needed to establish the most parsimonious phylogenetic patterns.