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J Bacteriol. Feb 1977; 129(2): 1091–1101.
PMCID: PMC235050

Bacterial parasite of a plant nematode: morphology and ultrastructure.


The life cycle of a bacterial endoparasite of the plant-parasitic nematode Meloidogyne incognita was examined by scanning and transmission electron microscopy. The infective stage begins with the attachment of an endospore to the surface of the nematode. A germ tube then penetrates the cuticle, and mycelil colonies form in the pseudocoelom. Sporulation is initiated when terminal cells of the mycelium enlarge to form sporangia. A septum within each sporangium divides the forespore from the basal or parasporal portion of the cell. The forespore becomes enclosed by several laminar coats. The parasporal cell remains attached to the forespore and forms the parasporal microfibers. After the newly formed spores are released into the soil, these microfibers apparently enable a mature spore to attach to the nematode. These results indicate that the endoparasite is a procaryotic organism having structural features that are more common to members of Actinomycetales and to the bacterium Pasteuria ramosa than to the sporozoans or to the family Bacillaceae, as previous investigatios have concluded.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.
  • Cross T. Symposium on bacterial spores: 8. The diversity of bacterial spores. J Appl Bacteriol. 1970 Mar;33(1):95–102. [PubMed]
  • Cross T, Walker PD, Gould GW. Thermophilic actinomycetes producing resistant endospores. Nature. 1968 Oct 26;220(5165):352–354. [PubMed]
  • Spurr AR. A low-viscosity epoxy resin embedding medium for electron microscopy. J Ultrastruct Res. 1969 Jan;26(1):31–43. [PubMed]
  • Staley JT. Budding bacteria of the Pasteuria-Blastobacter group. Can J Microbiol. 1973 May;19(5):609–614. [PubMed]

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