Embryology of Macroptilium arenarium (Leguminosae)

Macroptilium arenarium (Bacigalupo) S.I.Drewes & R.A.Palacios produces two floral morphs, aerial chasmogamous flowers and cleistogamous flowers in geophyte racemes. A comparative study of the sporogenesis, gametogenesis and the development of the related sporophytic structures in both floral mor...

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Autores principales: Gotelli, M., Galati, B., Hoc, P.
Formato: JOUR
Materias:
angiosperm
apomixis
comparative study
embryonic development
floral trait
genotype
pollen
Endothecium
Fabaceae
Macroptilium
Polygonum
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00671924_v54_n6_p531_Gotelli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00671924_v54_n6_p531_Gotelli
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spelling todo:paper_00671924_v54_n6_p531_Gotelli2023-10-03T14:53:11Z Embryology of Macroptilium arenarium (Leguminosae) Gotelli, M. Galati, B. Hoc, P. angiosperm apomixis comparative study embryonic development floral trait genotype pollen Endothecium Fabaceae Macroptilium Polygonum Macroptilium arenarium (Bacigalupo) S.I.Drewes & R.A.Palacios produces two floral morphs, aerial chasmogamous flowers and cleistogamous flowers in geophyte racemes. A comparative study of the sporogenesis, gametogenesis and the development of the related sporophytic structures in both floral morphs is reported. The anther is tetrasporangiate, its wall consists of epidermis, endothecium, one or two middle layers and an uninucleate secretory tapetum. The mature endothecium presents fibrilar thickenings that are more developed in cleistogamous flowers. Pollen grains are tricolporate, angulaperturate, and are shed at bicellular stage. The ovule is crassinucelate, bitegmic and anacampylotropous. Megaspore tetrads with linear arrangement have been observed in chasmogamous flowers, whereas only megaspore dyads have been found in cleistogamous flowers. In both floral morphs the chalazal megaspore develops into an embryo sac of Polygonum type. Apomixis is considered as a possible replacement for sexual reproduction in cleistogamous flowers. © CSIRO 2006. Fil:Gotelli, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Galati, B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Hoc, P. 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_00671924_v54_n6_p531_Gotelli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic angiosperm
apomixis
comparative study
embryonic development
floral trait
genotype
pollen
Endothecium
Fabaceae
Macroptilium
Polygonum
spellingShingle angiosperm
apomixis
comparative study
embryonic development
floral trait
genotype
pollen
Endothecium
Fabaceae
Macroptilium
Polygonum
Gotelli, M.
Galati, B.
Hoc, P.
Embryology of Macroptilium arenarium (Leguminosae)
topic_facet angiosperm
apomixis
comparative study
embryonic development
floral trait
genotype
pollen
Endothecium
Fabaceae
Macroptilium
Polygonum
description Macroptilium arenarium (Bacigalupo) S.I.Drewes & R.A.Palacios produces two floral morphs, aerial chasmogamous flowers and cleistogamous flowers in geophyte racemes. A comparative study of the sporogenesis, gametogenesis and the development of the related sporophytic structures in both floral morphs is reported. The anther is tetrasporangiate, its wall consists of epidermis, endothecium, one or two middle layers and an uninucleate secretory tapetum. The mature endothecium presents fibrilar thickenings that are more developed in cleistogamous flowers. Pollen grains are tricolporate, angulaperturate, and are shed at bicellular stage. The ovule is crassinucelate, bitegmic and anacampylotropous. Megaspore tetrads with linear arrangement have been observed in chasmogamous flowers, whereas only megaspore dyads have been found in cleistogamous flowers. In both floral morphs the chalazal megaspore develops into an embryo sac of Polygonum type. Apomixis is considered as a possible replacement for sexual reproduction in cleistogamous flowers. © CSIRO 2006.
format JOUR
author Gotelli, M.
Galati, B.
Hoc, P.
author_facet Gotelli, M.
Galati, B.
Hoc, P.
author_sort Gotelli, M.
title Embryology of Macroptilium arenarium (Leguminosae)
title_short Embryology of Macroptilium arenarium (Leguminosae)
title_full Embryology of Macroptilium arenarium (Leguminosae)
title_fullStr Embryology of Macroptilium arenarium (Leguminosae)
title_full_unstemmed Embryology of Macroptilium arenarium (Leguminosae)
title_sort embryology of macroptilium arenarium (leguminosae)
url http://hdl.handle.net/20.500.12110/paper_00671924_v54_n6_p531_Gotelli
work_keys_str_mv AT gotellim embryologyofmacroptiliumarenariumleguminosae
AT galatib embryologyofmacroptiliumarenariumleguminosae
AT hocp embryologyofmacroptiliumarenariumleguminosae
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