Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)

This paper deals with the ovule and anther structure, sporogenesis, and gametogenesis of Anreda cordifolia (Ten.) Steenis. The conclusions are: the anther wall develops according to the Monocotyledonous type of DAVIS (1966). The tapetum is secretory and the endothecial cells develop U-form thickenin...

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Autores principales: Pozner, R., Maldonado, S.
Formato: JOUR
Materias:
Anredera cordifolia
Anther and ovule development
Basellaceae
Embryo sac
Embryology
Megasporogenesis
Microsporogenesis
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00170070_v123_n1-2_p39_Pozner
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00170070_v123_n1-2_p39_Pozner2023-10-03T14:14:55Z Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae) Pozner, R. Maldonado, S. Anredera cordifolia Anther and ovule development Basellaceae Embryo sac Embryology Megasporogenesis Microsporogenesis This paper deals with the ovule and anther structure, sporogenesis, and gametogenesis of Anreda cordifolia (Ten.) Steenis. The conclusions are: the anther wall develops according to the Monocotyledonous type of DAVIS (1966). The tapetum is secretory and the endothecial cells develop U-form thickenings on radial and internal tangential walls. Microspore mother cells undergo simultaneous cytokinesis and the microspore tetrads are tetrahedral. Pollen grains are 3-celled when shed. At anthesis the ovule is orthoamphitropous crassinucellar and bitegmic with the micropyle formed by the inner integument. The archesporial cell cuts off a primary parietal cell which becomes the parietal tissue. A nucellar cap develops from the nucellar epidermis. The outer integument is dermal and subdermal in origin but the inner is only dermal. Only one archesporial cell differentiates from the nucellus, and the megaspores are arranged in T-tedrads. The chalazal megaspore produces an 8-nucleate embryo sac which develops according to the Polygonum type. The mature synergids present a filiform apparatus that accords to the type. I following Cocucci (1981). The antipodal cells are ephemeral. Starch grains accumulate in the synergids, egg cell and central cell. Finally, the systematic value for Basellaceae of the embryological characters here considered, is discussed. © Taylor & Francis Group, LLC. Fil:Pozner, R. 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_00170070_v123_n1-2_p39_Pozner
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anredera cordifolia
Anther and ovule development
Basellaceae
Embryo sac
Embryology
Megasporogenesis
Microsporogenesis
spellingShingle Anredera cordifolia
Anther and ovule development
Basellaceae
Embryo sac
Embryology
Megasporogenesis
Microsporogenesis
Pozner, R.
Maldonado, S.
Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)
topic_facet Anredera cordifolia
Anther and ovule development
Basellaceae
Embryo sac
Embryology
Megasporogenesis
Microsporogenesis
description This paper deals with the ovule and anther structure, sporogenesis, and gametogenesis of Anreda cordifolia (Ten.) Steenis. The conclusions are: the anther wall develops according to the Monocotyledonous type of DAVIS (1966). The tapetum is secretory and the endothecial cells develop U-form thickenings on radial and internal tangential walls. Microspore mother cells undergo simultaneous cytokinesis and the microspore tetrads are tetrahedral. Pollen grains are 3-celled when shed. At anthesis the ovule is orthoamphitropous crassinucellar and bitegmic with the micropyle formed by the inner integument. The archesporial cell cuts off a primary parietal cell which becomes the parietal tissue. A nucellar cap develops from the nucellar epidermis. The outer integument is dermal and subdermal in origin but the inner is only dermal. Only one archesporial cell differentiates from the nucellus, and the megaspores are arranged in T-tedrads. The chalazal megaspore produces an 8-nucleate embryo sac which develops according to the Polygonum type. The mature synergids present a filiform apparatus that accords to the type. I following Cocucci (1981). The antipodal cells are ephemeral. Starch grains accumulate in the synergids, egg cell and central cell. Finally, the systematic value for Basellaceae of the embryological characters here considered, is discussed. © Taylor & Francis Group, LLC.
format JOUR
author Pozner, R.
Maldonado, S.
author_facet Pozner, R.
Maldonado, S.
author_sort Pozner, R.
title Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)
title_short Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)
title_full Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)
title_fullStr Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)
title_full_unstemmed Embryological studies in anredera cordifolia (Ten.) steenis (basellaceae)
title_sort embryological studies in anredera cordifolia (ten.) steenis (basellaceae)
url http://hdl.handle.net/20.500.12110/paper_00170070_v123_n1-2_p39_Pozner
work_keys_str_mv AT poznerr embryologicalstudiesinanrederacordifoliatensteenisbasellaceae
AT maldonados embryologicalstudiesinanrederacordifoliatensteenisbasellaceae
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