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Monica Mirta Steciow - One of the best experts on this subject based on the ideXlab platform.
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achlya spiralis a new aquatic oomycete with bent Oogonial stalks isolated from the burgundian region of france
Fems Microbiology Letters, 2008Co-Authors: Bernard Paul, Monica Mirta SteciowAbstract:Achlya spiralis sp. nov. was isolated from water samples collected in the river Tille in the Burgundian region of France. The new oomycete is described, illustrated and compared with related species of the genus Achlya. It is characterized by the presence of smooth-walled Oogonia that are usually borne on bent or twisted Oogonial stalks; mainly monoclinous, androgynous and diclinous antheridial branches and eccentric oospores which generally do not mature or mature after a long period of time. The internal transcribed spacer (ITS) region of its rRNA is comprised of 671 bases. The taxonomic description of this new species, its comparison with related oomycetes and the sequence of the ITS region of its rRNA are discussed here.
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a new species of brevilegnia saprolegniales straminipila from buenos aires province argentina
Mycologia, 2003Co-Authors: Monica Mirta SteciowAbstract:Brevilegnia ensenadensis sp. nov. is described from litter (floating twigs, leaves, and roots) in a man-made, polluted channel near a petroleum refinery, in Buenos Aires Province, Argentina. The species is illustrated and compared with other species of the genus; it can be identified by the preponderance of smooth or papillate Oogonia, with a distinctive irregular inner wall, borne in bent or coiled Oogonial stalks, which are terminal, lateral or of the intercalary position. The Oogonia often are irregular in shape, and the oospheres mostly are immature. The single oospore is eccentric inside the great Oogonia, and the species develops mainly diclinous antheridial branches and has fewer monoclinous and androgynous ones.
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Saprolegnia oliviae sp. nov. isolated from an Argentine river (Tierra del Fuego Province, Argentina)
FEMS microbiology letters, 2003Co-Authors: Monica Mirta SteciowAbstract:Saprolegnia oliviae sp. nov. is described from litter (floating dead twigs, leaves and roots) in the Olivia River, Ushuaia Department, Tierra del Fuego Province (Argentina). The new species is illustrated and compared with other species of the genus. Distinguishing characteristics of S. oliviae are the production of smooth Oogonia (with some lateral or terminal projections) and the absence of antheridial branches on the majority of the Oogonia, but when present, they are mostly diclinous, at times Oogonia are supplied with androgynous and monoclinous antheridial branches. The Oogonial stalks are predominantly short and straight or long and bent, curved or many times coiled; oospores are distinctive subcentric, (1-) 15-50 (-70) per oogonium. Morphological details of the new species and its comparison with other described species are discussed here.
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a robusta sp nov a new species of achlya saprolegniales straminipila from a polluted argentine channel
Microbiological Research, 2002Co-Authors: Monica Mirta Steciow, Lorena Alejandra EliadesAbstract:Summary Achlya robusta sp. nov. was found on litter (floating twigs, leaves, and roots) in an artificial polluted channel, near a petroleum refinery, in Buenos Aires province, Argentina. The species is described, illustrated and compared with other species of the genus. A. robusta produces mainly smooth and papillate, tuberculate or bullate Oogonia and monoclinous antheridial branches. It develops spherical and subglobose Oogonia, with the Oogonial wall yellowish and containing mainly immature oospheres. The oospores are eccentric and ranging from (1) 4–17 (30) per oogonium.
Bernard Paul - One of the best experts on this subject based on the ideXlab platform.
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achlya spiralis a new aquatic oomycete with bent Oogonial stalks isolated from the burgundian region of france
Fems Microbiology Letters, 2008Co-Authors: Bernard Paul, Monica Mirta SteciowAbstract:Achlya spiralis sp. nov. was isolated from water samples collected in the river Tille in the Burgundian region of France. The new oomycete is described, illustrated and compared with related species of the genus Achlya. It is characterized by the presence of smooth-walled Oogonia that are usually borne on bent or twisted Oogonial stalks; mainly monoclinous, androgynous and diclinous antheridial branches and eccentric oospores which generally do not mature or mature after a long period of time. The internal transcribed spacer (ITS) region of its rRNA is comprised of 671 bases. The taxonomic description of this new species, its comparison with related oomycetes and the sequence of the ITS region of its rRNA are discussed here.
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A new species of Pythium isolated from a vineyard in France.
FEMS microbiology letters, 2006Co-Authors: Bernard PaulAbstract:Pythium apiculatum sp. nov. is a new oomycete characterized by the presence of both ornamented and smooth-walled Oogonia. The ornamentations are blunt, and at times, bent. The oomycete was isolated from soil samples taken in a vineyard in the Burgundian region of France. Morphologically, it resembles some species having ornamented Oogonia like Pythium radiosum, Pythium echinulatum, and resembles, also the species having smooth-walled Oogonia like Pythium hypogynum and Pythium acrogynum. However, the oomycete has its own distinguishing characteristics which, when combined with molecular features, enables us to describe it as a new species. The taxonomic description of this new oomycete, its comparison with related species, and the sequence of the ITS region of its rRNA gene, are described in this article.
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ITS1 region of the rDNA of Pythium proliferatum, a new species: its taxonomy and its comparison with related species
FEMS microbiology letters, 2001Co-Authors: Bernard PaulAbstract:Pythium longandrum (F-73.0) was isolated, from soil samples taken in Lille in northern France. Morphologically the fungus resembles closely Pythium rostratum, however its antheridial characters are unique. The Oogonia of this species are provided with hypogynous and monoclinous antheridia. The antheridial cells are inflated and are probably the largest and longest for the genus. The internal transcribed spacer region of its nuclear ribosomal DNA indicates that it is entirely different from all other species of Pythium. This new species is characterized by its spherical to elongated sporangia, smooth-walled Oogonia and hypogynous to monoclinous antheridia bearing long antheridial cells closely applied to the Oogonia. Morphological features of this new species, together with the sequences of the ITS region of its nuclear ribosomal DNA and comparison with related species are discussed here.
Steciow, Mónica Mirta - One of the best experts on this subject based on the ideXlab platform.
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A. robusta sp. nov., a new species of Achlya (saprolegniales, straminipila) from a polluted argentine channel
2019Co-Authors: Steciow, Mónica Mirta, Elíades, Lorena AlejandraAbstract:Achlya robusta sp. nov. was found on litter (floating twigs, leaves, and roots) in an artificial polluted channel, near a petroleum refinery, in Buenos Aires province, Argentina. The species is described, illustrated and compared with other species of the genus. A. robusta produces mainly smooth and papillate, tuberculate or bullate Oogonia and monoclinous antheridial branches. It develops spherical and subglobose Oogonia, with the Oogonial wall yellowish and containing mainly immature oospheres. The oospores are eccentric and ranging from (1) 4-17 (30) per oogonium.Instituto de Botánica "Dr. Carlos Spegazzini
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Saprolegnia oliviae sp. nov. isolated from an Argentine river (Tierra del Fuego Province, Argentina)
2019Co-Authors: Steciow, Mónica MirtaAbstract:Saprolegnia oliviae sp. nov. is described from litter (floating dead twigs, leaves and roots) in the Olivia River, Ushuaia Department, Tierra del Fuego Province (Argentina). The new species is illustrated and compared with other species of the genus. Distinguishing characteristics of S. oliviae are the production of smooth Oogonia (with some lateral or terminal projections) and the absence of antheridial branches on the majority of the Oogonia, but when present, they are mostly diclinous, at times Oogonia are supplied with androgynous and monoclinous antheridial branches. The Oogonial stalks are predominantly short and straight or long and bent, curved or many times coiled; oospores are distinctive subcentric, (1-) 15-50 (-70) per oogonium. Morphological details of the new species and its comparison with other described species are discussed here.Instituto de Botánica "Dr. Carlos Spegazzini
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A new freshwater species of Achlya from Tierra del Fuego Province, Argentina
2019Co-Authors: Steciow, Mónica MirtaAbstract:Achlya ambispora sp. nov. occurring on litter (floating dead leaves and twigs) in Las Cotofla stream, Tierra del Fuego Province, Argentina, is described and illusbated and cornpared with similar species. The species produces principally androgynous and monoclinous, rarely diclinous antheridial branches; Oogonial wall and oospores are distinctly yellowish at maturity and differ from other species in having also 1–6(-22) centric-subcentric oospores, in Oogonia somethes apiculate, that are frequently intercalary or proliferate in chains.Instituto de Botánica "Dr. Carlos Spegazzini
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A new species of Saprolegnia (Saprolegniales, Straminipila), from a polluted Argentine channel
2019Co-Authors: Steciow, Mónica Mirta, Elíades, Lorena AlejandraAbstract:Saprolegnia variabilis sp. nov. is described from litter (floating twigs, leaves, and roots) in a artificial polluted channel, near a petroleum refinery, in Buenos Aires Province, Argentina. The species is illustrated and compared with other species of the genus. It differs from S. australis in having mature subcentric oospores; the Oogonia and the oospores are larger and more variable in shape and size, and the number of oospores is greater. The Oogonial stalks are also variable in length and the zoosporangia are very much longer.Instituto de Botánica "Dr. Carlos Spegazzini
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Saprolegnia milnae (Saprolegniales, Straminipila), a new species from an Argentine river (Tierra del Fuego Province, Argentina)
2019Co-Authors: Steciow, Mónica MirtaAbstract:Saprolegnia milnae is described from litter (floating dead twigs, leaves, and roots) in the Milna River, Ushuaia Department, Tierra del Fuego Province (Argentina). The new species is illustrated and compared with other species of the genus. Distinguishing characteristics of S. milnae are the production of smooth Oogonia and predominantly contorted androgynous antheridial branches, and also monoclinous and diclinous ones. The Oogonial stalks are predominantly bent, curved or once coiled; oospores are subcentric, (1—)3—23(—40) per oogonium, and are variable in size, reaching a diameter of up to 60 μm.Instituto de Botánica "Dr. Carlos Spegazzini
Arkadiy A. Reunov - One of the best experts on this subject based on the ideXlab platform.
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the Oogonia of macroalga undaria pinnatifida are alkaline phosphatase positive and contain germinal body like structures1
Journal of Phycology, 2008Co-Authors: Ya N. Alexandrova, Arkadiy A. ReunovAbstract:It was observed that in the female gametophyte of Undaria pinnatifida (Harv.) Suringar (Phaeophyta, Laminariales) gametangial initials and maturing Oogonia demonstrated different levels of alkaline-phosphatase activity (APA). The Oogonia exhibited a higher level of APA than in its initials. Electron-dense granular ovoid structures ∼0.5–0.6 μm were present in the cytoplasm of Oogonia. These inclusions were not membrane bound and do not appear to be associated with any particular organelles. The number of the inclusions was 1 to 2 in a single section of the cell. In essential details, the specific APA and subcellular germinal body-like structure of the developing female gamete in U. pinnatifida were very similar to those in metazoan oocytes.
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THE Oogonia OF MACROALGA UNDARIA PINNATIFIDA ARE ALKALINE‐PHOSPHATASE POSITIVE AND CONTAIN GERMINAL BODY‐LIKE STRUCTURES1
Journal of phycology, 2008Co-Authors: Ya N. Alexandrova, Arkadiy A. ReunovAbstract:It was observed that in the female gametophyte of Undaria pinnatifida (Harv.) Suringar (Phaeophyta, Laminariales) gametangial initials and maturing Oogonia demonstrated different levels of alkaline-phosphatase activity (APA). The Oogonia exhibited a higher level of APA than in its initials. Electron-dense granular ovoid structures ∼0.5–0.6 μm were present in the cytoplasm of Oogonia. These inclusions were not membrane bound and do not appear to be associated with any particular organelles. The number of the inclusions was 1 to 2 in a single section of the cell. In essential details, the specific APA and subcellular germinal body-like structure of the developing female gamete in U. pinnatifida were very similar to those in metazoan oocytes.
Ya N. Alexandrova - One of the best experts on this subject based on the ideXlab platform.
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the Oogonia of macroalga undaria pinnatifida are alkaline phosphatase positive and contain germinal body like structures1
Journal of Phycology, 2008Co-Authors: Ya N. Alexandrova, Arkadiy A. ReunovAbstract:It was observed that in the female gametophyte of Undaria pinnatifida (Harv.) Suringar (Phaeophyta, Laminariales) gametangial initials and maturing Oogonia demonstrated different levels of alkaline-phosphatase activity (APA). The Oogonia exhibited a higher level of APA than in its initials. Electron-dense granular ovoid structures ∼0.5–0.6 μm were present in the cytoplasm of Oogonia. These inclusions were not membrane bound and do not appear to be associated with any particular organelles. The number of the inclusions was 1 to 2 in a single section of the cell. In essential details, the specific APA and subcellular germinal body-like structure of the developing female gamete in U. pinnatifida were very similar to those in metazoan oocytes.
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THE Oogonia OF MACROALGA UNDARIA PINNATIFIDA ARE ALKALINE‐PHOSPHATASE POSITIVE AND CONTAIN GERMINAL BODY‐LIKE STRUCTURES1
Journal of phycology, 2008Co-Authors: Ya N. Alexandrova, Arkadiy A. ReunovAbstract:It was observed that in the female gametophyte of Undaria pinnatifida (Harv.) Suringar (Phaeophyta, Laminariales) gametangial initials and maturing Oogonia demonstrated different levels of alkaline-phosphatase activity (APA). The Oogonia exhibited a higher level of APA than in its initials. Electron-dense granular ovoid structures ∼0.5–0.6 μm were present in the cytoplasm of Oogonia. These inclusions were not membrane bound and do not appear to be associated with any particular organelles. The number of the inclusions was 1 to 2 in a single section of the cell. In essential details, the specific APA and subcellular germinal body-like structure of the developing female gamete in U. pinnatifida were very similar to those in metazoan oocytes.
