Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)

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• Background and Aims: Although orbicular functions are still a matter of debate, they are considered by most authors to be exclusively formed by a secretory tapetum. However, the presence of orbicules on a peritapetal membrane associated with a plasmodial tapetum has been described for Abutilon pic...

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Autores principales:	Galati, B.G., Monacci, F., Gotelli, M.M., Rosenfeldt, S.
Formato:	JOUR
Materias:	Invasive non-syncytial tapetum Modiolastrum malvifolium Orbicules Peritapetal membrane angiosperm cytoplasm developmental stage invasive species pollen spore Abutilon pictum Magnoliophyta Malvaceae Modiolastrum article growth, development and aging histology transmission electron microscopy ultrastructure Microscopy, Electron, Transmission Pollen
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03057364_v99_n4_p755_Galati
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_03057364_v99_n4_p755_Galati
record_format	dspace
spelling	todo:paper_03057364_v99_n4_p755_Galati2023-10-03T15:21:58Z Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae) Galati, B.G. Monacci, F. Gotelli, M.M. Rosenfeldt, S. Invasive non-syncytial tapetum Modiolastrum malvifolium Orbicules Peritapetal membrane angiosperm cytoplasm developmental stage invasive species pollen spore Abutilon pictum Magnoliophyta Malvaceae Modiolastrum angiosperm article growth, development and aging histology pollen transmission electron microscopy ultrastructure Malvaceae Microscopy, Electron, Transmission Pollen • Background and Aims: Although orbicular functions are still a matter of debate, they are considered by most authors to be exclusively formed by a secretory tapetum. However, the presence of orbicules on a peritapetal membrane associated with a plasmodial tapetum has been described for Abutilon pictum (Malvaceae) in a previous study. Thus, studies on other species of Malvaceae are necessary to corroborate the presence of such bodies in other members of the family. Pollen and microsporangium development of Modiolastrum malvifolium has been studied in this work. • Methods: Anthers at different stages of development were processed for transmission electron microscopy and light microscopy. Membranes and pollen walls resistant to acetolysis were isolated from whole anthers. • Key Results: Microspore tetrads have a tetrahedral arrangement. Pollen grains are shed at the bicellular stage. The tapetum is invasive, non-syncytial and a peritapetal membrane with orbicules is formed. • Conclusions: This is the first report of the presence of orbicules on a peritapetal membrane in a species with a tapetum of an invasive, non-syncytial type. Taking into consideration all the information on the subject, it can be concluded that the presence of orbicules is not a stable criterion to differentiate between a secretory or plasmodial, or intermediate invasive, non-syncytial tapetum. © The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. Fil:Galati, B.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Monacci, F. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03057364_v99_n4_p755_Galati
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Invasive non-syncytial tapetum Modiolastrum malvifolium Orbicules Peritapetal membrane angiosperm cytoplasm developmental stage invasive species pollen spore Abutilon pictum Magnoliophyta Malvaceae Modiolastrum angiosperm article growth, development and aging histology pollen transmission electron microscopy ultrastructure Malvaceae Microscopy, Electron, Transmission Pollen
spellingShingle	Invasive non-syncytial tapetum Modiolastrum malvifolium Orbicules Peritapetal membrane angiosperm cytoplasm developmental stage invasive species pollen spore Abutilon pictum Magnoliophyta Malvaceae Modiolastrum angiosperm article growth, development and aging histology pollen transmission electron microscopy ultrastructure Malvaceae Microscopy, Electron, Transmission Pollen Galati, B.G. Monacci, F. Gotelli, M.M. Rosenfeldt, S. Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
topic_facet	Invasive non-syncytial tapetum Modiolastrum malvifolium Orbicules Peritapetal membrane angiosperm cytoplasm developmental stage invasive species pollen spore Abutilon pictum Magnoliophyta Malvaceae Modiolastrum angiosperm article growth, development and aging histology pollen transmission electron microscopy ultrastructure Malvaceae Microscopy, Electron, Transmission Pollen
description	• Background and Aims: Although orbicular functions are still a matter of debate, they are considered by most authors to be exclusively formed by a secretory tapetum. However, the presence of orbicules on a peritapetal membrane associated with a plasmodial tapetum has been described for Abutilon pictum (Malvaceae) in a previous study. Thus, studies on other species of Malvaceae are necessary to corroborate the presence of such bodies in other members of the family. Pollen and microsporangium development of Modiolastrum malvifolium has been studied in this work. • Methods: Anthers at different stages of development were processed for transmission electron microscopy and light microscopy. Membranes and pollen walls resistant to acetolysis were isolated from whole anthers. • Key Results: Microspore tetrads have a tetrahedral arrangement. Pollen grains are shed at the bicellular stage. The tapetum is invasive, non-syncytial and a peritapetal membrane with orbicules is formed. • Conclusions: This is the first report of the presence of orbicules on a peritapetal membrane in a species with a tapetum of an invasive, non-syncytial type. Taking into consideration all the information on the subject, it can be concluded that the presence of orbicules is not a stable criterion to differentiate between a secretory or plasmodial, or intermediate invasive, non-syncytial tapetum. © The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved.
format	JOUR
author	Galati, B.G. Monacci, F. Gotelli, M.M. Rosenfeldt, S.
author_facet	Galati, B.G. Monacci, F. Gotelli, M.M. Rosenfeldt, S.
author_sort	Galati, B.G.
title	Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
title_short	Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
title_full	Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
title_fullStr	Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
title_full_unstemmed	Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)
title_sort	pollen, tapetum and orbicule development in modiolastrum malvifolium (malvaceae)
url	http://hdl.handle.net/20.500.12110/paper_03057364_v99_n4_p755_Galati
work_keys_str_mv	AT galatibg pollentapetumandorbiculedevelopmentinmodiolastrummalvifoliummalvaceae AT monaccif pollentapetumandorbiculedevelopmentinmodiolastrummalvifoliummalvaceae AT gotellimm pollentapetumandorbiculedevelopmentinmodiolastrummalvifoliummalvaceae AT rosenfeldts pollentapetumandorbiculedevelopmentinmodiolastrummalvifoliummalvaceae
_version_	1807323176865103872

Pollen, tapetum and orbicule development in Modiolastrum malvifolium (Malvaceae)

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