Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae

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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: Zini, Lucía Melisa, Galati, Beatriz Gloria, Ferrucci, María Silvia, Zarlavsky, Gabriela Elena, Rosenfeldt, Sonia
Formato: Artículo
Lenguaje:Inglés
Publicado: Elsevier Gmbh 2021
Materias:
Cabomba caroliniana
Filiform apparatus
Nymphaea gardneriana
Transfer cell
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/30332
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-30332
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spelling I48-R184-123456789-303322024-10-15T11:04:23Z Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae Zini, Lucía Melisa Galati, Beatriz Gloria Ferrucci, María Silvia Zarlavsky, Gabriela Elena Rosenfeldt, Sonia Cabomba caroliniana Filiform apparatus Nymphaea gardneriana Transfer cell 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. 2021-12-09T16:32:39Z 2021-12-09T16:32:39Z 2016 Artículo Zini, Lucía Melisa, et al., 2016. Ultrastructural study of the female gametophyte and the epistase in cabombaceae and nymphaeaceae. Flora. Berlín: Elsevier Gmbh, vol. 220, p. 25-36. ISSN 0367-2530. 0367-2530 http://repositorio.unne.edu.ar/handle/123456789/30332 eng https://www.sciencedirect.com/science/article/abs/pii/S0367253016300160?via%3Dihub openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Elsevier Gmbh Flora, 2016, vol. 220, p. 25-36.
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
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AT galatibeatrizgloria ultrastructuralstudyofthefemalegametophyteandtheepistaseincabombaceaeandnymphaeaceae
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