Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae
Ultrastructural studies on the female gametophyte are restricted to species at relatively derived positions in the angiosperm phylogenetic tree. Therefore, this topic remains mostly unknown for the early divergent lineages, in which a four-celled megagametophyte is common. Here, ultrastructure of t...
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Autores principales: | , , , , |
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Formato: | Artículo |
Lenguaje: | Inglés |
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Elsevier Gmbh
2021
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Materias: | |
Acceso en línea: | http://repositorio.unne.edu.ar/handle/123456789/30332 |
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id |
I48-R184-123456789-30332 |
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record_format |
dspace |
institution |
Universidad Nacional del Nordeste |
institution_str |
I-48 |
repository_str |
R-184 |
collection |
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) |
language |
Inglés |
topic |
Cabomba caroliniana Filiform apparatus Nymphaea gardneriana Transfer cell |
spellingShingle |
Cabomba caroliniana Filiform apparatus Nymphaea gardneriana Transfer cell Zini, Lucía Melisa Galati, Beatriz Gloria Ferrucci, María Silvia Zarlavsky, Gabriela Elena Rosenfeldt, Sonia Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
topic_facet |
Cabomba caroliniana Filiform apparatus Nymphaea gardneriana Transfer cell |
description |
Ultrastructural studies on the female gametophyte are restricted to species at relatively derived positions
in the angiosperm phylogenetic tree. Therefore, this topic remains mostly unknown for the early divergent lineages, in which a four-celled megagametophyte is common. Here, ultrastructure of the
megagametophyte and micropylar nucellar epidermis was investigated in Cabomba caroliniana A. Gray
(Cabombaceae), Nymphaea gardneriana Planch. and Victoria cruziana Orb. (Nymphaeaceae). The micropy lar nucellar epidermis ofthe studied species differentiates into an epistase. These cells have metabolically
active cytoplasm and thickened inner tangential walls. Epistase ultrastructure is compatible with a trans fer cell specialization. This tissue may play an adaptive role in the secretion of chemotropic substances
to direct the pollen tube growth toward the female gametophyte. The cytological characteristics of
the female germ unit in members of Cabombaceae and Nymphaeaceae are generally similar to other
angiosperms that develop a typical seven-celled, eight-nucleate female gametophyte; however, they
differ in some specific points. In V. cruziana and N. gardneriana, the micropylar end of the synergids
develops a rudimentary filiform apparatus with slight inward projections. By contrast, the synergids
lack a filiform apparatus in C. caroliniana. Unlike most studied angiosperms, the filiform apparatus in
the clade Cabombaceae-Nymphaeaceae is underdeveloped or absent, therefore character state transfor mations have occurred within basal angiosperms. The potential evolutionary shifts of this reproductive
feature are highlighted. |
format |
Artículo |
author |
Zini, Lucía Melisa Galati, Beatriz Gloria Ferrucci, María Silvia Zarlavsky, Gabriela Elena Rosenfeldt, Sonia |
author_facet |
Zini, Lucía Melisa Galati, Beatriz Gloria Ferrucci, María Silvia Zarlavsky, Gabriela Elena Rosenfeldt, Sonia |
author_sort |
Zini, Lucía Melisa |
title |
Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
title_short |
Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
title_full |
Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
title_fullStr |
Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
title_full_unstemmed |
Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
title_sort |
ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae |
publisher |
Elsevier Gmbh |
publishDate |
2021 |
url |
http://repositorio.unne.edu.ar/handle/123456789/30332 |
work_keys_str_mv |
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Repositorios |
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