Skip to main content Accessibility help
×
Home

The tylenchid (Nematoda) egg shell: formation of the egg shell in Meloidogyne javanica

  • Michael A. McClure (a1) and A. F. Bird (a1)

Summary

Oogonia of Meloidogyne javanica are radially arranged around a central rachis to which they are attached by cytoplasmic bridges. As the oocytes mature the rachis disappears and the oocytes pass through the oviduct in tandem. The oviduct-spermatotheca valve is constructed of two rows of tightly packed cells of which there are four per row. The nuclei of these cells are large and contain balloon-shaped cytoplasmic invaginations. The spermatotheca is characterized by microtubules which extend to its lumen and by invaginations of plasmalemma. Cells of the distal uterine region contain large intracytoplasmic spaces bordered by endoplasmic reticulum whereas proximal uterine cells have dense cytoplasm and large areas of compact endoplasmic reticulum. Egg-shell formation begins in the spermatotheca with the modification of the oolemma to form the vitelline layer. The chitinous layer begins in the distal portion of the uterus and appears to originate from the egg. Proline-containing protein is incorporated into the chitinous and lipid layers as the egg passes through the mid-region of the uterus and formation of the lipid layer in this region completes egg development.

Copyright

References

Hide All
Bird, A. F. (1968). Changes associated with parasitism in nematodes. III. Ultrastructure of the egg shell, larval cuticle, and contents of the subventral esophageal glands in Meloidogyne javanica, with some observations on hatching. Journal of Parasitology 54, 475–89.
Bird, A. F. (1971). The Structure of Nematodes. New York, London: Academic Press.
Bird, A. F. & McClure, M. A. (1976). The tylenchid (Nematoda) egg shell: structure, composition and permeability. Parasitology 72, 1928.
Crompton, D. W. T. & Lee, D. L. (1965). The fine structure of the body wall of Polymorphus minutus (Goeze, 1782) (Acanthocephala). Parasitology 55, 357–64.
Foor, W. E. (1967). Ultrastructural aspects of oocyte development in Ascaris lumbricoides. Journal of Parasitology 53, 1245–61.
Geraert, E. (1972). A comparative study of the structure of female gonads in plant-parasitic tylenchida (Nematoda). Annales de la Soci 102 171–98.
Lee, D. L. & Lešťan, P. (1971). Oogenesis and egg shell formation in Heterakis gallinarum (Nematoda). Journal of Zoology, London 164, 189–96.
McLaren, D. J. (1973). Oogenesis and fertilization in Dipetalonema viteae (Nematoda: Filaroidea). Parasitology 66, 465–72.
Paweletz, M. (1967). Specimen preparation methods for electron microscope autoradiography. Siemens Review 34, 32–7.
Triantaphyllou, A. C. (1962). Oogenesis in the root-knot nematode Meloidogyne javanica. Nematologica 7, 105–13.
Yuen, P. H. (1964). The female gonad in the subfamily Hoplolaiminae with a note on the spermatotheca of Tylenchorhynchus. Nematologica 10, 570–80.
Yuen, P. H. (1971 a). Electron microscope studies on Aphelenchoides blastophthorus (Nematoda). I. The female genital tube. Nematologica 17, 112.
Yuen, P. H. (1971 b). Electron microscope studies on Aphelenchoides blastophthorus (Nematoda). II. Oogenesis. Nematologica 17, 1322.

The tylenchid (Nematoda) egg shell: formation of the egg shell in Meloidogyne javanica

  • Michael A. McClure (a1) and A. F. Bird (a1)

Metrics

Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.