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The life-history of Pleistophora gigantea, Thélohan (Glugea gigantea Thél.)

Published online by Cambridge University Press:  06 April 2009

N. H. Swellengrebel
N. H. Swellengrebel
Affiliation:
(From the Hygienic Institute, University of Amsterdam.)
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Extract

The parasite which I have here described has a life-history containing two distinct stages: a vegetative stage and a sporogonic stage. During the vegetative period multinucleate individuals divide by irregular schizogony producing young uni- or paucinucleate individuals. During the sporogonic period, a number of trophozoites unite to form an aggregation which becomes encysted. In the encysted individuals (the pansporoblasts) there is an increase of nuclear substance and a reduction of plasmatic substance. The nuclei become arranged in pairs and by successive unequal divisions the pansporoblasts produce thesporoblasts which contain a pair of nuclei each. During the formation of the sporoblasts there is an increase of protoplasmatic substance. The sporoblasts become spores by the thickening of their pelliculae.

At first the spores contain two nuclei, finally they become mononucleate. This must be explained by the fusion of the two nuclei.

This nuclear fusion is probably to be interpreted as a paedogamous autogamy (in accordance with the nomenclature of Hartmann, 1909).

Type
Research Article
Information
Parasitology , Volume 4 , Issue 4 , December 1911 , pp. 345 - 363
Copyright
Copyright © Cambridge University Press 1911

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References

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