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Oomycetes |
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Oomycetes [‚ō·ə·mī′sēd·ēz]
(mycology) A class of the Phycomycetes comprising the biflagellate water molds and downy mildews. Oomycetes A class of fungi in the subdivision Mastigomycotina. They comprise a group of heterotropic, funguslike organisms that are classified with the zoosporic fungi (Mastigomycotina) but in reality are related to the heterokont algae. They are distinguished from other zoosporic fungi by the presence of biflagellate zoospores. Some taxa are nonzoosporic. Asexual reproduction involves the release of zoospores from sporangia; in some taxa the sporangium germinates with outgrowth of a germ tube. Sexual reproduction occurs when an oogonial cell is fertilized by contact with an antheridium, resulting in one or more oospores. Oomycetes are cosmopolitan, occurring in fresh and salt water, in soil, and as terrestrial parasites of plants. Many species can be grown in pure culture on defined media. There are four orders: The Saprolegniales and Leptomitales are popularly known as water molds. Some species are destructive fish parasites. Many Lagenidiales are parasites of invertebrates and algae. The Peronosporales are primarily plant parasites attacking the root, stem, or leaf, and include some of the more destructive plant pathogens. See Eumycota, Fungi Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | infestans has been traditionally described as a fungus, but closer inspection puts it in the same family as oomycetes, or "water moulds. Among the pathogens described are bacteria, fungi, nematodes, oomycetes, viruses, and phytoplasmas. 3) PHYLUM OOMYCOTA The Third group is the kingdom Chromista phylum oomycota, they seem to be split and cannot make a clear decision on if it is better to have one smooth flagellum at the rear or to have a hairy one at the front, so the oomycetes have opted for two flagella at the side, one of the two is a hairy flagellum that points to the front and the other is a smooth one that points to the rear. |
Oomycetes |
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