Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications

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This is the first embryological report of the Grewioideae subfamily, which is meant to contribute to the characterisation of the genera Corchorus, Luehea and Triumfetta. Ovule and female gametophyte development in C. argutus, L. divaricata and T. semitriloba was analysed. The ovules of all species a...

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Autores principales: Lattar, Elsa Clorinda, Galati, Beatriz Gloria, Ferrucci, María Silvia
Formato: Artículo
Lenguaje:Inglés
Publicado: CSIRO Publishing 2021
Materias:
Callose
Corchorus
Female gametophyte
Hypostase
Luehea
Triumfetta
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/30328
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-30328
record_format dspace
spelling I48-R184-123456789-303282024-10-10T13:06:03Z Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications Lattar, Elsa Clorinda Galati, Beatriz Gloria Ferrucci, María Silvia Callose Corchorus Female gametophyte Hypostase Luehea Triumfetta This is the first embryological report of the Grewioideae subfamily, which is meant to contribute to the characterisation of the genera Corchorus, Luehea and Triumfetta. Ovule and female gametophyte development in C. argutus, L. divaricata and T. semitriloba was analysed. The ovules of all species are anatropous, bitegmic and of crassinucellate mixed type. The micropyle of the studied species is formed by the outer integument (exostome). The ovule of L. divaricata differs from those of the other two species because the chalazal tissue expands forming a cap, which gives rise to a wing in the seed. All species present one hypostase. The megaspore mother cell gives rise to a linear megaspore triad in C. argutus and L. divaricata, whereas in T. semitriloba, triads and diads can be observed in the same ovule. The chalazal megaspore develops a seven-celled and eight-nucleate female gametophyte corresponding to the Polygonum type. The synergids of L. divaricata have hooks and a conspicuous filiform apparatus. The antipodal cells in C. argutus are persistent, whereas in the other species, they are small and ephemeral. The embryological characters are compared with those of other taxa within the family and the megagametophyte formation in these species is discussed. 2021-12-09T15:37:33Z 2021-12-09T15:37:33Z 2016 Artículo Lattar, Elsa Clorinda, Galati, Beatriz Gloria y Ferrucci, María Silvia, 2016. Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications. Australian Journal of Botany. Australia: CSIRO Publishing, vol. 64, no. 5, p. 369-376. ISSN 1444-9862. 1444-9862 http://repositorio.unne.edu.ar/handle/123456789/30328 eng https://www.publish.csiro.au/bt/BT15230 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf CSIRO Publishing Australian Journal of Botany, 2016, vol. 64, no. 5, p. 369-376.
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 Callose
Corchorus
Female gametophyte
Hypostase
Luehea
Triumfetta
spellingShingle Callose
Corchorus
Female gametophyte
Hypostase
Luehea
Triumfetta
Lattar, Elsa Clorinda
Galati, Beatriz Gloria
Ferrucci, María Silvia
Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications
topic_facet Callose
Corchorus
Female gametophyte
Hypostase
Luehea
Triumfetta
description This is the first embryological report of the Grewioideae subfamily, which is meant to contribute to the characterisation of the genera Corchorus, Luehea and Triumfetta. Ovule and female gametophyte development in C. argutus, L. divaricata and T. semitriloba was analysed. The ovules of all species are anatropous, bitegmic and of crassinucellate mixed type. The micropyle of the studied species is formed by the outer integument (exostome). The ovule of L. divaricata differs from those of the other two species because the chalazal tissue expands forming a cap, which gives rise to a wing in the seed. All species present one hypostase. The megaspore mother cell gives rise to a linear megaspore triad in C. argutus and L. divaricata, whereas in T. semitriloba, triads and diads can be observed in the same ovule. The chalazal megaspore develops a seven-celled and eight-nucleate female gametophyte corresponding to the Polygonum type. The synergids of L. divaricata have hooks and a conspicuous filiform apparatus. The antipodal cells in C. argutus are persistent, whereas in the other species, they are small and ephemeral. The embryological characters are compared with those of other taxa within the family and the megagametophyte formation in these species is discussed.
format Artículo
author Lattar, Elsa Clorinda
Galati, Beatriz Gloria
Ferrucci, María Silvia
author_facet Lattar, Elsa Clorinda
Galati, Beatriz Gloria
Ferrucci, María Silvia
author_sort Lattar, Elsa Clorinda
title Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications
title_short Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications
title_full Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications
title_fullStr Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications
title_full_unstemmed Ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south America and its systematic implications
title_sort ovule and megagametophyte development in selected species of apeibeae and grewieae (malvaceae-grewioideae) from south america and its systematic implications
publisher CSIRO Publishing
publishDate 2021
url http://repositorio.unne.edu.ar/handle/123456789/30328
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