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ON THE RELATION BETWEEN DICTYOSOME AND CONTRACTILE VACUOLE IN SPONGES
Author(s) -
Lutfy R. G.
Publication year - 1956
Publication title -
journal of the royal microscopical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0368-3974
DOI - 10.1111/j.1365-2818.1956.tb00451.x
Subject(s) - vacuole , contractile vacuole , biology , golgi apparatus , vesicle , sponge , ultrastructure , microbiology and biotechnology , cytoplasm , botany , membrane , endoplasmic reticulum , biochemistry
SYNOPSIS 1. In the freshwater sponge Ephydatia , the osmiophile dictyosomes of the choanocytes are intimately related to the contractile vacuoles and show a great deal of morphological variation. In many cases the contractile vacuole itself possesses an osmiophile cortex. The condition here bears a general resemblance to the osmiophile vacuole‐reservoir complex of some flagellates. 2. In the marine sponge Grantia , the osmiophile dictyosomes still show morphological variations. The vacuoles or chromophobe areas of the dictyosomes increase in size under the effect of hypotonic solutions. However, in ordinary or control material, the vacuoles show quantitative variations, though to a much lesser extent. 3. The inference to be drawn from the above‐mentioned facts is that the sponge choanocyte dictyosome might be engaged in osmo‐regulation. 4. From electron microscope work on the contractile vacuole cortices of protozoans, the parabasals of flagellates and the dictyosomes of Grantia choanocytes, it is quite clear that these structures have one thing in common, i.e. the presence in all of them of double lamellæ or flattened closed vesicles, a character which they share with the metazoan Golgi apparatus.