Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)

The tribe Sipaneeae has its center of diversity on the Guiana Shield (northern South America), where 9 of the 10 genera occur, and a total of 44 species. It includes the genera Chalepophyllum (3 spp.), Dendrosipanea (3 spp.), Limnosipanea (3 spp.), Maguireothamnus (3 spp.), Neblinathamnus (2 spp.),...

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Autores principales: Delprete, P. G., Van der Beeten, I., De Block, P.
Formato: Artículo revista
Lenguaje:Inglés
Publicado: Instituto de Botánica del Nordeste 2023
Acceso en línea:https://revistas.unne.edu.ar/index.php/bon/article/view/6944
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Revistas UNNE - Universidad Nacional del Noroeste (UNNE) de Universidad Nacional del Nordeste
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spelling I48-R154-article-69442023-12-27T22:56:31Z Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae) Delprete, P. G. Van der Beeten, I. De Block, P. The tribe Sipaneeae has its center of diversity on the Guiana Shield (northern South America), where 9 of the 10 genera occur, and a total of 44 species. It includes the genera Chalepophyllum (3 spp.), Dendrosipanea (3 spp.), Limnosipanea (3 spp.), Maguireothamnus (3 spp.), Neblinathamnus (2 spp.), Neobertiera (5 spp.), Pteridocalyx (1 sp.), Sipanea (17 spp.), Sipaneopsis (8 spp.), and Steyermarkia (1 sp.). The pollen morphology of all the genera of the tribe was studied. For pollen preparation, nearly mature flower buds (just before anthesis) were taken from herbarium material. Pollen grains destined for light microscope (LM) studies were mounted in Kaiser’s glycerine jelly. Pollen grains for scanning electron microscope (SEM) studies were suspended in ethanol and mounted on aluminium stubs using carbon adhesive tape and coated with a platinum palladium. Values of the length of polar and equatorial axes were based on LM-measurements. In all the genera, pollen grains are released in monads, and are 3- or 4-colporate. In most genera the number of colpi are consistently 3 or 4, which represents a significant diagnostic character. The largest pollen grains are found in Maguireothamnus, which is also the genus with the largest corollas in the tribe. The second largest grains in the tribe are found in Chalepophyllum, which is the genus with the second largest corollas in the tribe. The smallest pollen grains are found in Neobertiera, Pteridocalyx, and Sipanea, which are the genera with the smallest corollas in the tribe. The exine is externally foveolate-reticulate in Chalepophyllum, Neblinathamnus, Pteridocalyx, and Sipanea, foveolate or foveolate-reticulate in Dendrosipanea, shallowly foveolate, without perforations or finely perforated in Limnosipanea, smooth or finely foveolate in Maguireothamnus, and foveolate in Neobertiera, Sipaneopsis, and Steyermarkia. Possible pollen dimorphism was observed only in populations of S. pratensis var. pratensis, in which pollen grains dimensions and external ornamentation were found to be similar. Instituto de Botánica del Nordeste 2023-10-26 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://revistas.unne.edu.ar/index.php/bon/article/view/6944 Bonplandia; Vol. 32 (2023): Suplemento; 7 Bonplandia; Vol. 32 (2023): Suplemento; 7 1853-8460 0524-0476 eng https://revistas.unne.edu.ar/index.php/bon/article/view/6944/6358 Derechos de autor 2023 Bonplandia http://creativecommons.org/licenses/by/4.0
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-154
container_title_str Revistas UNNE - Universidad Nacional del Noroeste (UNNE)
language Inglés
format Artículo revista
author Delprete, P. G.
Van der Beeten, I.
De Block, P.
spellingShingle Delprete, P. G.
Van der Beeten, I.
De Block, P.
Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)
author_facet Delprete, P. G.
Van der Beeten, I.
De Block, P.
author_sort Delprete, P. G.
title Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)
title_short Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)
title_full Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)
title_fullStr Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)
title_full_unstemmed Pollen morphology in the tribe Sipaneeae (Rubiaceae, Ixoroideae)
title_sort pollen morphology in the tribe sipaneeae (rubiaceae, ixoroideae)
description The tribe Sipaneeae has its center of diversity on the Guiana Shield (northern South America), where 9 of the 10 genera occur, and a total of 44 species. It includes the genera Chalepophyllum (3 spp.), Dendrosipanea (3 spp.), Limnosipanea (3 spp.), Maguireothamnus (3 spp.), Neblinathamnus (2 spp.), Neobertiera (5 spp.), Pteridocalyx (1 sp.), Sipanea (17 spp.), Sipaneopsis (8 spp.), and Steyermarkia (1 sp.). The pollen morphology of all the genera of the tribe was studied. For pollen preparation, nearly mature flower buds (just before anthesis) were taken from herbarium material. Pollen grains destined for light microscope (LM) studies were mounted in Kaiser’s glycerine jelly. Pollen grains for scanning electron microscope (SEM) studies were suspended in ethanol and mounted on aluminium stubs using carbon adhesive tape and coated with a platinum palladium. Values of the length of polar and equatorial axes were based on LM-measurements. In all the genera, pollen grains are released in monads, and are 3- or 4-colporate. In most genera the number of colpi are consistently 3 or 4, which represents a significant diagnostic character. The largest pollen grains are found in Maguireothamnus, which is also the genus with the largest corollas in the tribe. The second largest grains in the tribe are found in Chalepophyllum, which is the genus with the second largest corollas in the tribe. The smallest pollen grains are found in Neobertiera, Pteridocalyx, and Sipanea, which are the genera with the smallest corollas in the tribe. The exine is externally foveolate-reticulate in Chalepophyllum, Neblinathamnus, Pteridocalyx, and Sipanea, foveolate or foveolate-reticulate in Dendrosipanea, shallowly foveolate, without perforations or finely perforated in Limnosipanea, smooth or finely foveolate in Maguireothamnus, and foveolate in Neobertiera, Sipaneopsis, and Steyermarkia. Possible pollen dimorphism was observed only in populations of S. pratensis var. pratensis, in which pollen grains dimensions and external ornamentation were found to be similar.
publisher Instituto de Botánica del Nordeste
publishDate 2023
url https://revistas.unne.edu.ar/index.php/bon/article/view/6944
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AT vanderbeeteni pollenmorphologyinthetribesipaneeaerubiaceaeixoroideae
AT deblockp pollenmorphologyinthetribesipaneeaerubiaceaeixoroideae
first_indexed 2024-08-21T22:36:56Z
last_indexed 2024-08-21T22:36:56Z
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