Pollen ontogeny in Magnolia liliflora Desr.

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Pollen ontogeny contributes significantly to the evolutionary analysis and the understanding of the reproductive biology of seed plants. Although much research on basal angiosperms is being carried out there are still many important features about which little is known in these taxa, such as the spo...

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Autores principales:	Galati, Beatriz Gloria, Rosenfeldt, Sonia, Gotelli, Marina María
Publicado:	2012
Materias:	Basal angiosperms Centripetally growing furrows Magnolia liliflora Orbicules Pollen Magnolia quinquepeta Magnoliaceae Magnoliophyta Spermatophyta
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03782697_v298_n3_p527_Galati http://hdl.handle.net/20.500.12110/paper_03782697_v298_n3_p527_Galati
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_03782697_v298_n3_p527_Galati
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spelling	paper:paper_03782697_v298_n3_p527_Galati2023-06-08T15:39:35Z Pollen ontogeny in Magnolia liliflora Desr. Galati, Beatriz Gloria Rosenfeldt, Sonia Gotelli, Marina María Basal angiosperms Centripetally growing furrows Magnolia liliflora Orbicules Pollen Magnolia quinquepeta Magnoliaceae Magnoliophyta Spermatophyta Pollen ontogeny contributes significantly to the evolutionary analysis and the understanding of the reproductive biology of seed plants. Although much research on basal angiosperms is being carried out there are still many important features about which little is known in these taxa, such as the sporophytic structures related to pollen development and morphology. In this study, pollen development of Magnolia liliflora was analyzed by optical microscopy and transmission electron microscopy. The aim of this paper was to supply data that will help characterize basal angiosperms. Microsporogenesis is of the successive type, so that tetrads are decussate or isobilateral. The callosic walls form by the centripetal growth of furrows. The secretory tapetum develops orbicules, which start to form in the microspore tetrad stage. Pollen grains are shed at the bicellular stage. The exine wall has a granular infratectum. Ultrastructural changes observed in the cytoplasm of microspores and tapetal cells are related to the development of the pollen grain wall and orbicules. Centrifugal cell plates are more usual for the successive type of microsporogenesis. The presence of the successive type of microsporogenesis with callosic walls formed by the centripetal growth of furrows could reflect the fact that the successive type in Magnoliaceae is derived from the simultaneous type. The granular infratectum of the ectexine and the presence of orbicules could indicate that this species is one of the most evolved of the genus. © 2011 Springer-Verlag. Fil:Galati, B.G. 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:Gotelli, M.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2012 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03782697_v298_n3_p527_Galati http://hdl.handle.net/20.500.12110/paper_03782697_v298_n3_p527_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	Basal angiosperms Centripetally growing furrows Magnolia liliflora Orbicules Pollen Magnolia quinquepeta Magnoliaceae Magnoliophyta Spermatophyta
spellingShingle	Basal angiosperms Centripetally growing furrows Magnolia liliflora Orbicules Pollen Magnolia quinquepeta Magnoliaceae Magnoliophyta Spermatophyta Galati, Beatriz Gloria Rosenfeldt, Sonia Gotelli, Marina María Pollen ontogeny in Magnolia liliflora Desr.
topic_facet	Basal angiosperms Centripetally growing furrows Magnolia liliflora Orbicules Pollen Magnolia quinquepeta Magnoliaceae Magnoliophyta Spermatophyta
description	Pollen ontogeny contributes significantly to the evolutionary analysis and the understanding of the reproductive biology of seed plants. Although much research on basal angiosperms is being carried out there are still many important features about which little is known in these taxa, such as the sporophytic structures related to pollen development and morphology. In this study, pollen development of Magnolia liliflora was analyzed by optical microscopy and transmission electron microscopy. The aim of this paper was to supply data that will help characterize basal angiosperms. Microsporogenesis is of the successive type, so that tetrads are decussate or isobilateral. The callosic walls form by the centripetal growth of furrows. The secretory tapetum develops orbicules, which start to form in the microspore tetrad stage. Pollen grains are shed at the bicellular stage. The exine wall has a granular infratectum. Ultrastructural changes observed in the cytoplasm of microspores and tapetal cells are related to the development of the pollen grain wall and orbicules. Centrifugal cell plates are more usual for the successive type of microsporogenesis. The presence of the successive type of microsporogenesis with callosic walls formed by the centripetal growth of furrows could reflect the fact that the successive type in Magnoliaceae is derived from the simultaneous type. The granular infratectum of the ectexine and the presence of orbicules could indicate that this species is one of the most evolved of the genus. © 2011 Springer-Verlag.
author	Galati, Beatriz Gloria Rosenfeldt, Sonia Gotelli, Marina María
author_facet	Galati, Beatriz Gloria Rosenfeldt, Sonia Gotelli, Marina María
author_sort	Galati, Beatriz Gloria
title	Pollen ontogeny in Magnolia liliflora Desr.
title_short	Pollen ontogeny in Magnolia liliflora Desr.
title_full	Pollen ontogeny in Magnolia liliflora Desr.
title_fullStr	Pollen ontogeny in Magnolia liliflora Desr.
title_full_unstemmed	Pollen ontogeny in Magnolia liliflora Desr.
title_sort	pollen ontogeny in magnolia liliflora desr.
publishDate	2012
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03782697_v298_n3_p527_Galati http://hdl.handle.net/20.500.12110/paper_03782697_v298_n3_p527_Galati
work_keys_str_mv	AT galatibeatrizgloria pollenontogenyinmagnolialilifloradesr AT rosenfeldtsonia pollenontogenyinmagnolialilifloradesr AT gotellimarinamaria pollenontogenyinmagnolialilifloradesr
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Pollen ontogeny in Magnolia liliflora Desr.

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