Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Mode of Reproduction and Development of the Reproductive System of Helicotylenchus Dihystera

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Nematologica
For more content, see Nematology.

The morphology of the adult female reproductive system was studied in Helicolylenchus dibystera and H. digonicus. In both species, it was found to comprise the following parts: Ovary (8.7 to 21.2 oogonia and oocytes in anterior gonad, 7.6 to 18.3 in posterior gonad of H. dihystera), narrow .constriction (four cells), tubular oviduct (sixteen cells), constriction (eight cells), dorsally bulging, nonfunctional spermatotheca (twelve cells), glandular tricolumella (twelve cells) and uterus proper. The final number of cells making up the spermatotheca is determined during the last molt, no cell divisions take place later in the adult. No spermatozoa could be demonstrated in the spermatotheca or in any other part of the gonoducts and reproduction was by mitotic parthenogenesis. The cells of the tricolumella have a secretory function and the material they produce appears to be deposited on the surface of the eggs. The post-embryonic development of H. dihystera comprises four larval stages and the adult. The first molt takes place within the egg. The three larval stages outside the egg can be recognized on the basis of the degree of development of the reproductive system. The reproductive system of each larval stage has a constant number of nuclei. Nuclear divisions in the reproductive system occur only during molting, whereas cell enlargement takes place mainly during the larval stages. The reproductive system consists of four nuclei in the second larval stage, fourteen nuclei in the third and 108 nuclei in the fourth larval stage. The final differentiation of the various gonadal parts takes place during the fourth molt. Specialized ventral chord nuclei and some other nuclei outside the gonad whose origin could not be determined take part in the formation of the vagina. One of the central nuclei of the gonad proper appears to function as vaginal organizer ("I" nucleus).

Affiliations: 1: Department of Plant Pathology and Department of Genetics, respectively, North Carolina State University at Raleigh, N. C., U.S.A


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
    Nematologica — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation