Orbicules in relation to the pollination modes

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Orbicules or Ubisch bodies are corpuscles of sporopollenin that appear in the anther locule during pollen grain development. Their size ranges from 0.14 μm to 20 μm. They present different shapes with a smooth or ornamented surface. Orbicules often form aggregates and sometimes have a plaque-like ap...

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Autores principales: Galati, Beatriz Gloria, Gotelli, Marina María, Rosenfeldt, Sonia, Torretta, Juan Pablo
Publicado: 2011
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816120_v_n_p149_Galati
http://hdl.handle.net/20.500.12110/paper_97816120_v_n_p149_Galati
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_97816120_v_n_p149_Galati2023-06-08T16:38:15Z Orbicules in relation to the pollination modes Galati, Beatriz Gloria Gotelli, Marina María Rosenfeldt, Sonia Torretta, Juan Pablo Orbicules or Ubisch bodies are corpuscles of sporopollenin that appear in the anther locule during pollen grain development. Their size ranges from 0.14 μm to 20 μm. They present different shapes with a smooth or ornamented surface. Orbicules often form aggregates and sometimes have a plaque-like appearance. Ultrastructurally, they may present a central core with different degree of transparency to electrons. Those that do not have a central core are observed completely solid. Orbicules are resistant to acetolisis, autofluorescent when irradiated with ultraviolet light and have the same reaction to colorants that the exine of pollen grains. Their presence is generally associated with a tapetal membrane in species with secretor type tapetum and with a peritapetal membrane in species with intermediate or plasmodial type tapetum. Although the shed of orbicules out of the anther along with the pollen grains is cited, they are usually attached to the inner surface of the locule when the anther opens. Investigations suggest that orbicules appear in approximately 80 families of Angiosperms and Gimnosperms. It is not certain whether orbicules are not developed in the rests of the families or are just not informed. Researches on ontogeny and ultrastructure of orbicules are rare. However, their tapetal origin and their simultaneous formation with the pollen grain wall are well established. The systematic value of orbicules is known and considered in a few families, such as Loganiaceae, Gentianaceae, Apocynaceae, Rubiaceae and Oxalidaceae. Evolutionary studies on these bodies or on its relationship with the different modes of pollination are lacking. Even though orbicules are so common among angiosperms, their function is unknown and only speculations are made. On this report a review on orbicules is made and an analysis of their presence, ontogeny and morphology is presented. Our aim is to supply information that will help understand orbicules function. Therefore, the orbicules morphology in relation with the pollination mode is studied. © 2010 Nova Science Publishers, Inc. Fil:Galati, B.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gotelli, M.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rosenfeldt, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Torretta, J.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816120_v_n_p149_Galati http://hdl.handle.net/20.500.12110/paper_97816120_v_n_p149_Galati
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Orbicules or Ubisch bodies are corpuscles of sporopollenin that appear in the anther locule during pollen grain development. Their size ranges from 0.14 μm to 20 μm. They present different shapes with a smooth or ornamented surface. Orbicules often form aggregates and sometimes have a plaque-like appearance. Ultrastructurally, they may present a central core with different degree of transparency to electrons. Those that do not have a central core are observed completely solid. Orbicules are resistant to acetolisis, autofluorescent when irradiated with ultraviolet light and have the same reaction to colorants that the exine of pollen grains. Their presence is generally associated with a tapetal membrane in species with secretor type tapetum and with a peritapetal membrane in species with intermediate or plasmodial type tapetum. Although the shed of orbicules out of the anther along with the pollen grains is cited, they are usually attached to the inner surface of the locule when the anther opens. Investigations suggest that orbicules appear in approximately 80 families of Angiosperms and Gimnosperms. It is not certain whether orbicules are not developed in the rests of the families or are just not informed. Researches on ontogeny and ultrastructure of orbicules are rare. However, their tapetal origin and their simultaneous formation with the pollen grain wall are well established. The systematic value of orbicules is known and considered in a few families, such as Loganiaceae, Gentianaceae, Apocynaceae, Rubiaceae and Oxalidaceae. Evolutionary studies on these bodies or on its relationship with the different modes of pollination are lacking. Even though orbicules are so common among angiosperms, their function is unknown and only speculations are made. On this report a review on orbicules is made and an analysis of their presence, ontogeny and morphology is presented. Our aim is to supply information that will help understand orbicules function. Therefore, the orbicules morphology in relation with the pollination mode is studied. © 2010 Nova Science Publishers, Inc.
author Galati, Beatriz Gloria
Gotelli, Marina María
Rosenfeldt, Sonia
Torretta, Juan Pablo
spellingShingle Galati, Beatriz Gloria
Gotelli, Marina María
Rosenfeldt, Sonia
Torretta, Juan Pablo
Orbicules in relation to the pollination modes
author_facet Galati, Beatriz Gloria
Gotelli, Marina María
Rosenfeldt, Sonia
Torretta, Juan Pablo
author_sort Galati, Beatriz Gloria
title Orbicules in relation to the pollination modes
title_short Orbicules in relation to the pollination modes
title_full Orbicules in relation to the pollination modes
title_fullStr Orbicules in relation to the pollination modes
title_full_unstemmed Orbicules in relation to the pollination modes
title_sort orbicules in relation to the pollination modes
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_97816120_v_n_p149_Galati
http://hdl.handle.net/20.500.12110/paper_97816120_v_n_p149_Galati
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AT gotellimarinamaria orbiculesinrelationtothepollinationmodes
AT rosenfeldtsonia orbiculesinrelationtothepollinationmodes
AT torrettajuanpablo orbiculesinrelationtothepollinationmodes
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