The encystment of a freshwater dinoflagellate: A light and electron-microscopical study
Titel:
The encystment of a freshwater dinoflagellate: A light and electron-microscopical study
Auteur:
Bibby, B. T. Dodge, J. D.
Verschenen in:
European journal of phycology
Paginering:
Jaargang 7 (1972) nr. 1 pagina's 85-100
Jaar:
1972-03-15
Inhoud:
The process of encystment, or resting spore formation, in a freshwater dinoflagellate (Woloszynskia tylota nov. comb.) has been studied with both light and electron microscopy. The main features of the process are as follows: (i) the replacement of the theca by a thin, amorphous outer wall, which gradually thickens by the deposition of material on its inner face; (ii) the appearance of a layer of closely-packed lipid droplets at the cytoplasmic margin of the mature cyst, resembling a granular 'inner wall' in the light microscope; (iii) the reduction in size or disappearance of cytoplasmic structures such as chloroplasts, Golgi bodies and pusule; and (iv) the enlargement of a central 'accumulation body' and cytoplasmic vacuoles containing crystals. Comparisons are made with light-microscope studies of encystment of other dinoflagellates, with ultrastructural studies of non-motile division stages, with zooxanthellae and with fossil dinoflagellate cysts or hystrichospheres.
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