Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis

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Variations in pollen characters and tapetum behavior were recently acknowledged in the early-divergent family Nymphaeaceae and even within the genus Nymphaea, which probably is not monophyletic; some traits such as infratectum and tapetum type are also a matter of different interpretations. In this...

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Autores principales: Zini, Lucía Melisa, Galati, Beatriz Gloria, Zarlavsky, Gabriela Elena, Ferrucci, María Silvia
Formato: Artículo
Lenguaje:Inglés
Publicado: Springer 2021
Materias:
Exine
Membranous granular layer
Orbicules
Pollen
Tapetum type
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/30344
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-30344
record_format dspace
spelling I48-R184-123456789-303442024-09-30T12:43:54Z Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis Zini, Lucía Melisa Galati, Beatriz Gloria Zarlavsky, Gabriela Elena Ferrucci, María Silvia Exine Membranous granular layer Orbicules Pollen Tapetum type Variations in pollen characters and tapetum behavior were recently acknowledged in the early-divergent family Nymphaeaceae and even within the genus Nymphaea, which probably is not monophyletic; some traits such as infratectum and tapetum type are also a matter of different interpretations. In this study, developmental characters of the pollen grains and tapetum in Nymphaea subgenus Hydrocallis are provided for the first time. Observations were made in N. amazonum, N. gardneriana, and N. prolifera using light, scanning, and transmission electron microscopy. Tapetum is of the secretory type and produces orbicules. At microspore and pollen grain stages, the distal and proximal walls differ considerably. This result supports the operculate condition of the aperture in Hydrocallis, and such aperture might be plesiomorphic for Nymphaeoideae. The infratectum is intermediate, composed of inter-columellae granular elements, robust columellae consisting of agglomerated granules, complete columellae, and fused columellae. Narrow microchannels are present and persist until the mature pollen grain stage. The membranous granular layer is often present in the pollen grains of Nymphaeaceae. In N. gardneriana, this layer is most probably a component of the intine because it is lost after acetolysis Orbicules in the Nymphaeaceae are characterized as spherical or subspherical, with a smooth sporopolleninic wall that surrounds an electron-lucent core and with individual orbicules that usually merge to give irregular aggregations. The aperture, pollen wall ultrastructure, and the tapetum of the studied species are discussed in an evolutionary and systematic context, and these characters are also compared with those of other angiosperm lineages. 2021-12-10T15:39:54Z 2021-12-10T15:39:54Z 2017 Artículo Zini, Lucía Melisa, et al., 2017. Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis. Protoplasma. Viena: Springer, vol. 254, no. 5, p. 1777-1790. ISSN 0033-183X. http://repositorio.unne.edu.ar/handle/123456789/30344 eng https://link.springer.com/article/10.1007/s00709-016-1074-8 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Springer Protoplasma, 2017, vol. 254, no. 5, p. 1777-1790.
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 Exine
Membranous granular layer
Orbicules
Pollen
Tapetum type
spellingShingle Exine
Membranous granular layer
Orbicules
Pollen
Tapetum type
Zini, Lucía Melisa
Galati, Beatriz Gloria
Zarlavsky, Gabriela Elena
Ferrucci, María Silvia
Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
topic_facet Exine
Membranous granular layer
Orbicules
Pollen
Tapetum type
description Variations in pollen characters and tapetum behavior were recently acknowledged in the early-divergent family Nymphaeaceae and even within the genus Nymphaea, which probably is not monophyletic; some traits such as infratectum and tapetum type are also a matter of different interpretations. In this study, developmental characters of the pollen grains and tapetum in Nymphaea subgenus Hydrocallis are provided for the first time. Observations were made in N. amazonum, N. gardneriana, and N. prolifera using light, scanning, and transmission electron microscopy. Tapetum is of the secretory type and produces orbicules. At microspore and pollen grain stages, the distal and proximal walls differ considerably. This result supports the operculate condition of the aperture in Hydrocallis, and such aperture might be plesiomorphic for Nymphaeoideae. The infratectum is intermediate, composed of inter-columellae granular elements, robust columellae consisting of agglomerated granules, complete columellae, and fused columellae. Narrow microchannels are present and persist until the mature pollen grain stage. The membranous granular layer is often present in the pollen grains of Nymphaeaceae. In N. gardneriana, this layer is most probably a component of the intine because it is lost after acetolysis Orbicules in the Nymphaeaceae are characterized as spherical or subspherical, with a smooth sporopolleninic wall that surrounds an electron-lucent core and with individual orbicules that usually merge to give irregular aggregations. The aperture, pollen wall ultrastructure, and the tapetum of the studied species are discussed in an evolutionary and systematic context, and these characters are also compared with those of other angiosperm lineages.
format Artículo
author Zini, Lucía Melisa
Galati, Beatriz Gloria
Zarlavsky, Gabriela Elena
Ferrucci, María Silvia
author_facet Zini, Lucía Melisa
Galati, Beatriz Gloria
Zarlavsky, Gabriela Elena
Ferrucci, María Silvia
author_sort Zini, Lucía Melisa
title Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
title_short Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
title_full Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
title_fullStr Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
title_full_unstemmed Developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
title_sort developmental and ultrastructural characters of the pollen grains and tapetum in species of nymphaea subgenus hydrocallis
publisher Springer
publishDate 2021
url http://repositorio.unne.edu.ar/handle/123456789/30344
work_keys_str_mv AT ziniluciamelisa developmentalandultrastructuralcharactersofthepollengrainsandtapetuminspeciesofnymphaeasubgenushydrocallis
AT galatibeatrizgloria developmentalandultrastructuralcharactersofthepollengrainsandtapetuminspeciesofnymphaeasubgenushydrocallis
AT zarlavskygabrielaelena developmentalandultrastructuralcharactersofthepollengrainsandtapetuminspeciesofnymphaeasubgenushydrocallis
AT ferruccimariasilvia developmentalandultrastructuralcharactersofthepollengrainsandtapetuminspeciesofnymphaeasubgenushydrocallis
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