Oomycota (oomycetes)

aquatic and terrestrial FUNGUS-like ORGANISMS, traditionally classified with the fungi, and according to some authorities, placed in the MASTIGOMYCOTINA. However, unlike most fungi, many oomycetes have a CELL WALL that appears to contain not CHITIN but CELLULOSE, and they typically produce motile ZOOSPORES, with two equal FLAGELLA, in ASEXUAL REPRODUCTION. Furthermore, SEXUAL REPRODUCTION is oogamous (see OOGAMY). Oomycetes may be PARASITES or SAPROBIONTS, and include water moulds and some important PATHOGENS of plants, such as Phytophthora infestans, which causes potato blight. This organism was responsible for the Irish potato famine in the 19th century.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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References in periodicals archive

Molecular phylogenetic analysis of genic regions from Achlya bisexualis (Oomycota) and Costaria costata (Chromophyta).

Algae containing chlorophylls a + c are paraphyletic: molecular evolutionaryanalysis of the Chromophyta

The term zoosporic true fungi will be used in this manuscript to refer to members of the Phyla Blastocladiomycota and Chytridiomycota, while heterotrophic straminipiles will be used here to refer to the Phyla Oomycota, Hyphochytriomycota and Labyrinthulomycota and plasmodiophorids to the Class Phytomyxea.

To date, 434 taxa have been recorded for both countries, being 174 (14 Blastocladiomycota, 42 Chytridiomycota, two Hyphochytriomycota, three Labyrinthulomycota, 112 Oomycota and one Phytomyxea) for Argentina and 348 (18 Blastocladiomycota, 121 Chytridiomycota, five Hyphochytriomycota, four Labyrinthulomycota, 196 Oomycota and four Phytomyxea) for Brazil.

Taxonomical studies of the Phylum Oomycota in Brazil are numerous, in particular, those referring to the orders Saprolegniales and Rhipidiales (e.g.

Considering that the estimated percentage of known species of Chytridiomycota and Oomycota is quite small (Mueller & Schmit, 2007), human activities and environmental change may lead to species losses before they have even been discovered.

vexans (Lagenidiales, Oomycota) en limnobios de la Provincia de Buenos Aires, Argentina.

Diversidade de Oomycota da Reserva Biologica de Paranapiacaba, Santo Andre, SP: primeiras citacoes para o Brasil.

Oomycota (Straminipila) da Reserva Biologica de Paranapiacaba, Santo Andre, SP, Brasil.

Novas citacoes de Chytridiomycota e Oomycota para o Parque Estadual das Fontes do Ipiranga (PEFI), SP, Brasil.

Chytridiomycota e Oomycota da "Represa do Guarapiranga", Sao Paulo, SP.

Hongos zoosporicos verdaderos, Straminipilas heterotroficos y Plasmodioforidios: estado del conocimiento en America del Sur