Oosféra
Oosféry Hyaloperonospora parasitica
Oosféra je velká nepohyblivá samičí (vaječná) gameta, která obsahuje zásobní látky. Je uložená v gametangiu. Splynutí samčí pohlavní buňky (spermatozoidu) s oosférou se nazývá oogamie. Vzniká u některých druhů řas a hub.
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Hyaloperonospora-parasitica-hyphae-oospore-2.jpg
Autor: Emmanuel Boutet, Licence: CC BY-SA 2.5
Hyphea of Hyaloperonospora parasitica (downy mildew) growing within the leaf of a compatible (susceptible) Arabidopsis thaliana (cf.wikipedia) observed by bright-field microscopy. The staining with trypan blue makes the cytoplasm of H. parasitica dark blue. The long structure is the hyphea, whereas the little spheres are haustoria. Bigger dark spheres are Oospores, the long term storage form of H. parasitica. This is the mating step of the short life cycle of H. parasitica.
Autor: Emmanuel Boutet, Licence: CC BY-SA 2.5
Hyphea of Hyaloperonospora parasitica (downy mildew) growing within the leaf of a compatible (susceptible) Arabidopsis thaliana (cf.wikipedia) observed by bright-field microscopy. The staining with trypan blue makes the cytoplasm of H. parasitica dark blue. The long structure is the hyphea, whereas the little spheres are haustoria. Bigger dark spheres are Oospores, the long term storage form of H. parasitica. This is the mating step of the short life cycle of H. parasitica.