Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion

The extreme reduction of flowers in the Balanophoraceae has generated few and incomplete studies with scattered and often contradictory results with respect to embryology. Using light and scanning microscopy, gynoecium, ovule and embryo-sac development are described in two (of 4) species of Lopho ph...

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Detalles Bibliográficos
Autores principales: Sato, Héctor Arnaldo, González, Ana María
Formato: Artículo
Lenguaje:Inglés
Publicado: Elsevier 2022
Materias:
Balanophoraceae
Embryo-sac
Holoparasite
Inversion
Lophophytum leandri
Lophophytum mirabile
Ovule
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/47975
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-47975
record_format dspace
spelling I48-R184-123456789-479752024-10-07T10:17:43Z Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion Sato, Héctor Arnaldo González, Ana María Balanophoraceae Embryo-sac Holoparasite Inversion Lophophytum leandri Lophophytum mirabile Ovule The extreme reduction of flowers in the Balanophoraceae has generated few and incomplete studies with scattered and often contradictory results with respect to embryology. Using light and scanning microscopy, gynoecium, ovule and embryo-sac development are described in two (of 4) species of Lopho phytum. The pistillate flower lacks perianth, and it is reduced to one pistil formed by a superior, biloculate ovary and two styles with capitated stigmas. Two ategmic hemianatropous ovules are inserted on the upper portion of a central placental column. The two locules are almost completely obstructed by the ovules. The term micropyle is not applicable in its usual sense, due to the absence of integuments. The term “micropylar pole” instead of micropyle was used to designate the apex of the nucellus, where the megaspore mother cell develops. Vascular supply is missing in the placenta and the ovule, therefore, the chalaza and the funiculus cannot be defined. The point of attachment of the nucellus to the placenta was designated “chalazal pole”. The embryo-sac is Adoxa type. During the migration of the two pairs of nuclei to the opposite poles,the four-nucleate embryo-sac tends to take a “J” shape. Each pair of nuclei undergoes a mitotic division to form an eight-nucleate embryo-sac. In the upper, chalazal pole of the embryo-sac, a typical egg-apparatus with a central egg-cell and two adjacent synergids cells is developed, while in the micropylar pole three antipodes are formed, all that determines an embryo-sac of reversed position. The analysis of the anatomy and development of pistillate flowers and the study of the functional architec ture of ovules, carpels and embryo-sac, provide embryological data of great importance to complement phylogenetic studies in the family Balanophoraceae, and even in order Santalales 2022-06-01T12:41:39Z 2022-06-01T12:41:39Z 2016-03 Artículo Sato, Héctor Arnaldo y González, Ana María, 2016. Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversión. Flora. Ámsterdam: Elsevier, vol. 2019, p. 35-47. ISSN 0367-2530. 0367-2530 http://repositorio.unne.edu.ar/handle/123456789/47975 eng https://www.sciencedirect.com/science/article/abs/pii/S0367253016000049?via%3Dihub openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Elsevier Flora, 2016, vol. 219, p. 35-47.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Balanophoraceae
Embryo-sac
Holoparasite
Inversion
Lophophytum leandri
Lophophytum mirabile
Ovule
spellingShingle Balanophoraceae
Embryo-sac
Holoparasite
Inversion
Lophophytum leandri
Lophophytum mirabile
Ovule
Sato, Héctor Arnaldo
González, Ana María
Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion
topic_facet Balanophoraceae
Embryo-sac
Holoparasite
Inversion
Lophophytum leandri
Lophophytum mirabile
Ovule
description The extreme reduction of flowers in the Balanophoraceae has generated few and incomplete studies with scattered and often contradictory results with respect to embryology. Using light and scanning microscopy, gynoecium, ovule and embryo-sac development are described in two (of 4) species of Lopho phytum. The pistillate flower lacks perianth, and it is reduced to one pistil formed by a superior, biloculate ovary and two styles with capitated stigmas. Two ategmic hemianatropous ovules are inserted on the upper portion of a central placental column. The two locules are almost completely obstructed by the ovules. The term micropyle is not applicable in its usual sense, due to the absence of integuments. The term “micropylar pole” instead of micropyle was used to designate the apex of the nucellus, where the megaspore mother cell develops. Vascular supply is missing in the placenta and the ovule, therefore, the chalaza and the funiculus cannot be defined. The point of attachment of the nucellus to the placenta was designated “chalazal pole”. The embryo-sac is Adoxa type. During the migration of the two pairs of nuclei to the opposite poles,the four-nucleate embryo-sac tends to take a “J” shape. Each pair of nuclei undergoes a mitotic division to form an eight-nucleate embryo-sac. In the upper, chalazal pole of the embryo-sac, a typical egg-apparatus with a central egg-cell and two adjacent synergids cells is developed, while in the micropylar pole three antipodes are formed, all that determines an embryo-sac of reversed position. The analysis of the anatomy and development of pistillate flowers and the study of the functional architec ture of ovules, carpels and embryo-sac, provide embryological data of great importance to complement phylogenetic studies in the family Balanophoraceae, and even in order Santalales
format Artículo
author Sato, Héctor Arnaldo
González, Ana María
author_facet Sato, Héctor Arnaldo
González, Ana María
author_sort Sato, Héctor Arnaldo
title Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion
title_short Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion
title_full Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion
title_fullStr Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion
title_full_unstemmed Floral development and anatomy of pistillate flowers of Lophophytum (Balanophoraceae), with special reference to the embryo sac inversion
title_sort floral development and anatomy of pistillate flowers of lophophytum (balanophoraceae), with special reference to the embryo sac inversion
publisher Elsevier
publishDate 2022
url http://repositorio.unne.edu.ar/handle/123456789/47975
work_keys_str_mv AT satohectorarnaldo floraldevelopmentandanatomyofpistillateflowersoflophophytumbalanophoraceaewithspecialreferencetotheembryosacinversion
AT gonzalezanamaria floraldevelopmentandanatomyofpistillateflowersoflophophytumbalanophoraceaewithspecialreferencetotheembryosacinversion
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