Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas

This paper is the first embryological report on the genus Cephalanthus L. and contributes to future studies in other genera in the tribe Naucleeae. The development of the anther wall in Cephalanthus glabratus (Spreng.) K. Schum. corresponds to the dicot type and microsporogenesis is simultaneous. Th...

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Autores principales: Romero, María Florencia, Salas, Roberto Manuel, González, Ana María
Formato: Artículo
Lenguaje:Inglés
Publicado: Csiro Publishing 2021
Materias:
Botánica
Ciencias naturales
Cephalanthus glabratus
Microsporogenesis
Pollen
Rubiaceae
Oncus
Orbicules
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/28700
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-28700
record_format dspace
spelling I48-R184-123456789-287002024-10-10T13:31:23Z Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas Romero, María Florencia Salas, Roberto Manuel González, Ana María Botánica Ciencias naturales Cephalanthus glabratus Microsporogenesis Pollen Rubiaceae Oncus Orbicules This paper is the first embryological report on the genus Cephalanthus L. and contributes to future studies in other genera in the tribe Naucleeae. The development of the anther wall in Cephalanthus glabratus (Spreng.) K. Schum. corresponds to the dicot type and microsporogenesis is simultaneous. The young wall of the anther has four layers: epidermis, endothecium, one middle layer and the secretory tapetum. The tissue of the septum has idioblasts with crystalline sand. In the wall of the mature anther, only the endothecium and remnants of epidermal cells were preserved. The occurrence and morphology of orbicules were observed in the mature anthers of all three species of Cephalanthus with scanning electron microscopy. The orbicules have taxonomic value at species level, since these structures allow us to distinguish between the species analyzed. The presence of a protruding oncus was observed for the first time in Cephalanthus in non-acetolyzed pollen grains. According to our observations, this structure is not affected by the state of anther dehiscence in Cephalanthus glabratus, because the oncus is visible and prominent in the mature pollen grains in both indehiscent and dehiscent anthers. 2021-09-17T17:40:53Z 2021-09-17T17:40:53Z 2017 Artículo Romero, María Florencia, Salas, Roberto Manuel y González, Ana María, 2017. Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas. Australian Journal of Botany. Clayton: Csiro Publishing, vol. 17, no. 3, p. 233-247. 1444-9862 http://repositorio.unne.edu.ar/handle/123456789/28700 eng https://sci-hub.se/10.1071/bt16238 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Csiro Publishing Australian Journal of Botany, 2017, vol. 65, no. 3, p. 233-247.
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 Botánica
Ciencias naturales
Cephalanthus glabratus
Microsporogenesis
Pollen
Rubiaceae
Oncus
Orbicules
spellingShingle Botánica
Ciencias naturales
Cephalanthus glabratus
Microsporogenesis
Pollen
Rubiaceae
Oncus
Orbicules
Romero, María Florencia
Salas, Roberto Manuel
González, Ana María
Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas
topic_facet Botánica
Ciencias naturales
Cephalanthus glabratus
Microsporogenesis
Pollen
Rubiaceae
Oncus
Orbicules
description This paper is the first embryological report on the genus Cephalanthus L. and contributes to future studies in other genera in the tribe Naucleeae. The development of the anther wall in Cephalanthus glabratus (Spreng.) K. Schum. corresponds to the dicot type and microsporogenesis is simultaneous. The young wall of the anther has four layers: epidermis, endothecium, one middle layer and the secretory tapetum. The tissue of the septum has idioblasts with crystalline sand. In the wall of the mature anther, only the endothecium and remnants of epidermal cells were preserved. The occurrence and morphology of orbicules were observed in the mature anthers of all three species of Cephalanthus with scanning electron microscopy. The orbicules have taxonomic value at species level, since these structures allow us to distinguish between the species analyzed. The presence of a protruding oncus was observed for the first time in Cephalanthus in non-acetolyzed pollen grains. According to our observations, this structure is not affected by the state of anther dehiscence in Cephalanthus glabratus, because the oncus is visible and prominent in the mature pollen grains in both indehiscent and dehiscent anthers.
format Artículo
author Romero, María Florencia
Salas, Roberto Manuel
González, Ana María
author_facet Romero, María Florencia
Salas, Roberto Manuel
González, Ana María
author_sort Romero, María Florencia
title Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas
title_short Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas
title_full Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas
title_fullStr Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas
title_full_unstemmed Pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the Americas
title_sort pollen development and orbicule and pollen grain morphology in species of cephalanthus (rubiaceae-naucleeae) from the americas
publisher Csiro Publishing
publishDate 2021
url http://repositorio.unne.edu.ar/handle/123456789/28700
work_keys_str_mv AT romeromariaflorencia pollendevelopmentandorbiculeandpollengrainmorphologyinspeciesofcephalanthusrubiaceaenaucleeaefromtheamericas
AT salasrobertomanuel pollendevelopmentandorbiculeandpollengrainmorphologyinspeciesofcephalanthusrubiaceaenaucleeaefromtheamericas
AT gonzalezanamaria pollendevelopmentandorbiculeandpollengrainmorphologyinspeciesofcephalanthusrubiaceaenaucleeaefromtheamericas
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