Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)

Oedogonium pluviale Nordstedt is nannandrous, described as possessing single-celled dwarf males. In some studies the dwarf males appear to have a reduced, lens-shaped pedicular portion whose nature and structure remain unclear. The present study aims to: 1) establish whether dwarf males of O. pluvia...

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Detalles Bibliográficos
Autor principal: Vélez, Carlos Guillermo
Publicado: 1998
Materias:
Androspores
Chlorophyceae
Dwarf males
Fine structure
Oedogoniales
Oedogonium pluviale
Pedicular portion
Ultrastructure
algae
Eukaryota
Oedogonium
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223646_v34_n2_p250_Leonardi
http://hdl.handle.net/20.500.12110/paper_00223646_v34_n2_p250_Leonardi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00223646_v34_n2_p250_Leonardi
record_format dspace
spelling paper:paper_00223646_v34_n2_p250_Leonardi2023-06-08T14:50:03Z Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae) Vélez, Carlos Guillermo Androspores Chlorophyceae Dwarf males Fine structure Oedogoniales Oedogonium pluviale Pedicular portion Ultrastructure algae Chlorophyceae Eukaryota Oedogoniales Oedogonium Oedogonium pluviale Oedogonium pluviale Oedogonium pluviale Nordstedt is nannandrous, described as possessing single-celled dwarf males. In some studies the dwarf males appear to have a reduced, lens-shaped pedicular portion whose nature and structure remain unclear. The present study aims to: 1) establish whether dwarf males of O. pluviale are single- or two-celled, 2) describe the different developmental stages of dwarf males, and 3) understand the nature of the pedicular portion. Milotic division of the dwarf male was observed, but neither upwards phycoplast migration nor synthesis of a gametangial cell wall occurred. Instead, the phycoplast and cell plate migrated downwards, producing a small pedicular portion whose content then degenerated. The antheridium occupied most of the dwarf male wall. Gametogenesis thus took place inside the wall of the young dwarf male (internal gametangium). Because the pedicular cell degenerated, we define this type of dwarf male as pseudo-single-celled to differentiate it from a true singled-celled dwarf male. The antheridial nucleus underwent one mitotic division to give rise to two gametes. Instead of a true wall between gametes, mucilage condensed and was observed as a discrete layer that disappeared during gamete release. Fil:Vélez, C.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223646_v34_n2_p250_Leonardi http://hdl.handle.net/20.500.12110/paper_00223646_v34_n2_p250_Leonardi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Androspores
Chlorophyceae
Dwarf males
Fine structure
Oedogoniales
Oedogonium pluviale
Pedicular portion
Ultrastructure
algae
Chlorophyceae
Eukaryota
Oedogoniales
Oedogonium
Oedogonium pluviale
Oedogonium pluviale
spellingShingle Androspores
Chlorophyceae
Dwarf males
Fine structure
Oedogoniales
Oedogonium pluviale
Pedicular portion
Ultrastructure
algae
Chlorophyceae
Eukaryota
Oedogoniales
Oedogonium
Oedogonium pluviale
Oedogonium pluviale
Vélez, Carlos Guillermo
Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)
topic_facet Androspores
Chlorophyceae
Dwarf males
Fine structure
Oedogoniales
Oedogonium pluviale
Pedicular portion
Ultrastructure
algae
Chlorophyceae
Eukaryota
Oedogoniales
Oedogonium
Oedogonium pluviale
Oedogonium pluviale
description Oedogonium pluviale Nordstedt is nannandrous, described as possessing single-celled dwarf males. In some studies the dwarf males appear to have a reduced, lens-shaped pedicular portion whose nature and structure remain unclear. The present study aims to: 1) establish whether dwarf males of O. pluviale are single- or two-celled, 2) describe the different developmental stages of dwarf males, and 3) understand the nature of the pedicular portion. Milotic division of the dwarf male was observed, but neither upwards phycoplast migration nor synthesis of a gametangial cell wall occurred. Instead, the phycoplast and cell plate migrated downwards, producing a small pedicular portion whose content then degenerated. The antheridium occupied most of the dwarf male wall. Gametogenesis thus took place inside the wall of the young dwarf male (internal gametangium). Because the pedicular cell degenerated, we define this type of dwarf male as pseudo-single-celled to differentiate it from a true singled-celled dwarf male. The antheridial nucleus underwent one mitotic division to give rise to two gametes. Instead of a true wall between gametes, mucilage condensed and was observed as a discrete layer that disappeared during gamete release.
author Vélez, Carlos Guillermo
author_facet Vélez, Carlos Guillermo
author_sort Vélez, Carlos Guillermo
title Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)
title_short Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)
title_full Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)
title_fullStr Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)
title_full_unstemmed Fine structure of dwarf males in Oedogonium pluviale (Chlorophyceae)
title_sort fine structure of dwarf males in oedogonium pluviale (chlorophyceae)
publishDate 1998
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223646_v34_n2_p250_Leonardi
http://hdl.handle.net/20.500.12110/paper_00223646_v34_n2_p250_Leonardi
work_keys_str_mv AT velezcarlosguillermo finestructureofdwarfmalesinoedogoniumpluvialechlorophyceae
_version_ 1768543643835039744

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