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Über die Entwicklung des marinen parasitischen PhycomycetenLagenisma coscinodisci (Lagenidiales)

On the development of the marine, parasitic phycomyceteLagenisma coscinodisci (Lagenidiales)

Abstract

This paper concentrates on the study of vegetative development and sexual reproduction inLagenisma coscinodisci Drebes. Before infecting a diatom cell (Coscinodiscus granii), the freshly released zoospores pass through two different cyst stages. The primary zoospores are kidney-shaped and laterally biflagellated. They form a primary cyst with a spiny cyst wall which is left by isomorphic secondary zoospores. The latter form a secondary cyst (sometimes perhaps repeatedly), which is smooth-walled. The secondary cyst germinates and infects a new diatom cell by means of an infecting tube which enters the cell through the gap between epi- and hypotheca and develops a new thallus. Sexual reproduction is induced by ageing of cultures. Two kinds of isomorphic, kidney-shaped, laterally biflagellated swarmers are produced as in zoosporogenesis. Female-determined swarmers settle down near the host cell and encyst with a more or less smooth wall (oogonia). Male-determined swarmers are obviously attracted by the oogonia and encyst close to them to form a more or less smooth-walled antheridium which drives a thin fertilization tube to the oogonium. During plasmogamy the oogonium develops a thick, short hypha. The cytoplasm with the two nuclei moves completely into this hypha, concentrates near the hyphal tip, and surrounds itself with a thick wall to become a resting spore (oospore) in which karyogamy takes place. The walls of cysts, tubes, hyphae and spores react positively with zinc-chlor-iodide. In the spines and walls of the primary cysts the network of 2 to 3 nm thick fibrils is more distinct than in the other walls.

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Schnepf, E., Drebes, G. Über die Entwicklung des marinen parasitischen PhycomycetenLagenisma coscinodisci (Lagenidiales). Helgolander Wiss. Meeresunters 29, 291–301 (1977). https://doi.org/10.1007/BF01614265

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  • DOI: https://doi.org/10.1007/BF01614265