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Ultrastructure of the Hyphae of Saprolegnia parasitica
Author(s) -
Xu Dehai,
Rogers Wilmer A.,
Rushing Ann E.
Publication year - 1990
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/1548-8667(1990)002<0289:uothos>2.3.co;2
Subject(s) - hypha , biology , vacuole , ultrastructure , endoplasmic reticulum , sporangium , organelle , botany , mycelium , vesicle , microbiology and biotechnology , cytoplasm , spore , membrane , biochemistry
Vegetative hyphae of Saprolegnia parasitica , a common parasitic fungus offish and fish eggs, are aseptate and have thin walls (30–90 nm). The hyphae contain large vacuoles and have elongate mitochondria and nuclei oriented parallel to the longitudinal axis and in the direction of hyphal extension. Presporangium hyphae, those hyphae that will form sporangia, also are aseptate, but have thicker walls (120–170 nm) and contain smaller vacuoles. Presporangium hyphae do not, in general, have the longitudinal orientation of organelles seen in vegetative hyphae. Densebody vesicles and primary bars, or encystment vesicles, as well as mitochondria, dictyosomes, and endoplasmic reticulum, are consistent features of these presporangium hyphae.