Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance
Nothofagaceae (southern beeches) are a relatively small flowering plant family of trees confined to the Southern Hemisphere. The fossil record of the family is abundant and it has been widely used as a test case for the classic hypothesis that Antarctica, Patagonia, Australia and New Zealand were on...
Published in: | Acta Palaeobotanica |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
De Gruyter
|
Subjects: | |
Online Access: | http://hdl.handle.net/11336/48708 |
id |
ftconicet:oai:ri.conicet.gov.ar:11336/48708 |
---|---|
record_format |
openpolar |
spelling |
ftconicet:oai:ri.conicet.gov.ar:11336/48708 2023-10-09T21:44:55+02:00 Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance Fernández, Damián Andrés Santamarina, Patricio Emmanuel Tellería, María Cristina Palazzesi, Luis Barreda, Viviana Dora application/pdf http://hdl.handle.net/11336/48708 eng eng De Gruyter info:eu-repo/semantics/altIdentifier/doi/10.1515/acpa-2016-0017 info:eu-repo/semantics/altIdentifier/url/https://content.sciendo.com/view/journals/acpa/56/2/article-p223.xml http://hdl.handle.net/11336/48708 Fernández, Damián Andrés; Santamarina, Patricio Emmanuel; Tellería, María Cristina; Palazzesi, Luis; Barreda, Viviana Dora; Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance; De Gruyter; Acta Palaeobotanica; 56; 2; 12-2016; 223-245 2082-0259 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ CHARACTER EVOLUTION EXINE STRUCTURE NOTHOFAGUS POLLEN MORPHOLOGY SOUTH AMERICA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1515/acpa-2016-0017 2023-09-24T19:44:25Z Nothofagaceae (southern beeches) are a relatively small flowering plant family of trees confined to the Southern Hemisphere. The fossil record of the family is abundant and it has been widely used as a test case for the classic hypothesis that Antarctica, Patagonia, Australia and New Zealand were once joined together. Although the phylogenetic relationships in Nothofagus appear to be well supported, the evolution of some pollen morphological traits remains elusive, largely because of the lack of ultrastructural analyses. Here we describe the pollen morphology of all extant South American species of Nothofagus, using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and light microscopy (LM), and reconstruct ancestral character states using a well-supported phylogenetic tree of the family. Our results indicate that the main differences between pollen of subgenera Fuscospora (pollen type fusca a) and Nothofagus (pollen type fusca b) are related to the size of microspines (distinguishable or not in optical section), and the thickening of colpi margins (thickened inwards, or thickened both inwards and outwards). In particular, Nothofagus alessandrii, the only extant South American species of subgenus Fuscospora, presents distinctive pollen features that have not been observed in any other species of the genus (i.e. a large granular infratectum and spongy apertural endexine). Species of subgenus Lophozonia are characterized by having the largest pollen grains, with polygonal outline in polar view, microspines distinguishable in optical section, long and non-thickened colpi, and a thin endexine. The reconstruction of character states for the node corresponding to the common ancestor to genus Nothofagus leads us to conclude that the ancestral form of Nothofagaceae should have had: equatorial diameter < 40 μm, circular outline in polar view, microspines distinguishable in optical section, short colpi thickened inwards, and a thin endexine. These features are fully consistent with those ... Article in Journal/Newspaper Antarc* Antarctica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Patagonia New Zealand Acta Palaeobotanica 56 2 223 245 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
CHARACTER EVOLUTION EXINE STRUCTURE NOTHOFAGUS POLLEN MORPHOLOGY SOUTH AMERICA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
CHARACTER EVOLUTION EXINE STRUCTURE NOTHOFAGUS POLLEN MORPHOLOGY SOUTH AMERICA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Fernández, Damián Andrés Santamarina, Patricio Emmanuel Tellería, María Cristina Palazzesi, Luis Barreda, Viviana Dora Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance |
topic_facet |
CHARACTER EVOLUTION EXINE STRUCTURE NOTHOFAGUS POLLEN MORPHOLOGY SOUTH AMERICA https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
Nothofagaceae (southern beeches) are a relatively small flowering plant family of trees confined to the Southern Hemisphere. The fossil record of the family is abundant and it has been widely used as a test case for the classic hypothesis that Antarctica, Patagonia, Australia and New Zealand were once joined together. Although the phylogenetic relationships in Nothofagus appear to be well supported, the evolution of some pollen morphological traits remains elusive, largely because of the lack of ultrastructural analyses. Here we describe the pollen morphology of all extant South American species of Nothofagus, using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and light microscopy (LM), and reconstruct ancestral character states using a well-supported phylogenetic tree of the family. Our results indicate that the main differences between pollen of subgenera Fuscospora (pollen type fusca a) and Nothofagus (pollen type fusca b) are related to the size of microspines (distinguishable or not in optical section), and the thickening of colpi margins (thickened inwards, or thickened both inwards and outwards). In particular, Nothofagus alessandrii, the only extant South American species of subgenus Fuscospora, presents distinctive pollen features that have not been observed in any other species of the genus (i.e. a large granular infratectum and spongy apertural endexine). Species of subgenus Lophozonia are characterized by having the largest pollen grains, with polygonal outline in polar view, microspines distinguishable in optical section, long and non-thickened colpi, and a thin endexine. The reconstruction of character states for the node corresponding to the common ancestor to genus Nothofagus leads us to conclude that the ancestral form of Nothofagaceae should have had: equatorial diameter < 40 μm, circular outline in polar view, microspines distinguishable in optical section, short colpi thickened inwards, and a thin endexine. These features are fully consistent with those ... |
format |
Article in Journal/Newspaper |
author |
Fernández, Damián Andrés Santamarina, Patricio Emmanuel Tellería, María Cristina Palazzesi, Luis Barreda, Viviana Dora |
author_facet |
Fernández, Damián Andrés Santamarina, Patricio Emmanuel Tellería, María Cristina Palazzesi, Luis Barreda, Viviana Dora |
author_sort |
Fernández, Damián Andrés |
title |
Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance |
title_short |
Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance |
title_full |
Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance |
title_fullStr |
Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance |
title_full_unstemmed |
Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance |
title_sort |
pollen morphology of nothofagus (nothofagaceae, fagales) and its phylogenetic significance |
publisher |
De Gruyter |
url |
http://hdl.handle.net/11336/48708 |
geographic |
Patagonia New Zealand |
geographic_facet |
Patagonia New Zealand |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1515/acpa-2016-0017 info:eu-repo/semantics/altIdentifier/url/https://content.sciendo.com/view/journals/acpa/56/2/article-p223.xml http://hdl.handle.net/11336/48708 Fernández, Damián Andrés; Santamarina, Patricio Emmanuel; Tellería, María Cristina; Palazzesi, Luis; Barreda, Viviana Dora; Pollen morphology of Nothofagus (Nothofagaceae, Fagales) and its phylogenetic significance; De Gruyter; Acta Palaeobotanica; 56; 2; 12-2016; 223-245 2082-0259 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1515/acpa-2016-0017 |
container_title |
Acta Palaeobotanica |
container_volume |
56 |
container_issue |
2 |
container_start_page |
223 |
op_container_end_page |
245 |
_version_ |
1779314609631526912 |