Search results for "Oospores"

showing 3 items of 3 documents

Achlya spiralis, a new aquatic oomycete with bent oogonial stalks, isolated from the Burgundian region of France

2008

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 reg…

Achlya spiralisAntheridiaMolecular Sequence DataFresh WaterMicrobiologyDNA AlgalOogoniaRiversGenusDNA Ribosomal SpacerBotanyGeneticsAchlya spiralisCiencias NaturalesInternal transcribed spacerrRNAMolecular BiologyOomyceteMicroscopybiologyITS regionSequence Analysis DNAAchlyaOosporesRibosomal RNAbiology.organism_classificationAchlyaAntheridiumOosporeFrance
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Aproximación a las comunidades de carófitos que existieron en la albufera de valencia a partir del estudio de las oósporas del sedimento

2009

14 páginas, 8 figuras, 3 tablas.

CarófitosTolypellaEspañaPlant ScienceValènciaNitellaCharaCharophytCarófitos; Oósporas; La Albufera; Valencia; España; Chara; Nitella; Tolypella; LamprothamniumAbundance (ecology)lcsh:BotanyBotany:CIENCIAS DE LA VIDA::Biología vegetal (Botánica) ::Biología marina [UNESCO]BalticaLamprothamniumNitellaEcology Evolution Behavior and SystematicsCharabiologyL’AlbuferaEcologySedimentLa AlbuferaVegetationOosporesOósporasbiology.organism_classificationlcsh:QK1-989SpainOosporeUNESCO::CIENCIAS DE LA VIDA::Biología vegetal (Botánica) ::Biología marinaValenciaCharophyteEutrophication
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A cytological and ultrastructural study on the maturation and germination of oospores of Plasmopara viticola from overwintering vine leaves.

1999

Observations on cytological and ultrastructural changes in Plasmopara viticola oospores were carried out during the overwintering period. Three types of oospores were observed. Type I, characterized by a thin inner oospore wall (IOW), large lipid globules and two nuclei, was recovered only in samples collected in October. These oospores were considered to be immature. Maturation occurred during November and involved a noticeable increase in thickness of the IOW, fusion of nuclei, formation of an ooplast and break up of large lipid globules into smaller ones (type II oospores). A few oospores (type III) showed abnormal organization with very large lipid globules and less frequently discernib…

Plasmopara viticola oospore maturation germinationSporangiumGerm tubePlasmopara viticola-oospores-germinationSettore AGR/12 - Patologia VegetalePlant ScienceBiologybiology.organism_classificationSporeCytoplasmPlasmopara viticolaOrganelleBotanyGeneticsUltrastructureOosporeEcology Evolution Behavior and SystematicsBiotechnology
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