Pollen ontogeny in Magnolia liliflora Desr.

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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Detalles Bibliográficos
Autores principales: Galati, B.G., Zarlavsky, G., Rosenfeldt, S., Gotelli, M.M.
Formato: JOUR
Materias:
Basal angiosperms
Centripetally growing furrows
Magnolia liliflora
Orbicules
Pollen
Magnolia quinquepeta
Magnoliaceae
Magnoliophyta
Spermatophyta
Acceso en línea: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 todo:paper_03782697_v298_n3_p527_Galati
record_format dspace
spelling todo:paper_03782697_v298_n3_p527_Galati2023-10-03T15:32:10Z Pollen ontogeny in Magnolia liliflora Desr. Galati, B.G. Zarlavsky, G. Rosenfeldt, S. Gotelli, M.M. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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, B.G.
Zarlavsky, G.
Rosenfeldt, S.
Gotelli, M.M.
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.
format JOUR
author Galati, B.G.
Zarlavsky, G.
Rosenfeldt, S.
Gotelli, M.M.
author_facet Galati, B.G.
Zarlavsky, G.
Rosenfeldt, S.
Gotelli, M.M.
author_sort Galati, B.G.
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.
url http://hdl.handle.net/20.500.12110/paper_03782697_v298_n3_p527_Galati
work_keys_str_mv AT galatibg pollenontogenyinmagnolialilifloradesr
AT zarlavskyg pollenontogenyinmagnolialilifloradesr
AT rosenfeldts pollenontogenyinmagnolialilifloradesr
AT gotellimm pollenontogenyinmagnolialilifloradesr
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