Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Botany |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200001 |
Resumo: | The chalazal megaspore develops in a Polygonum-type embryo sac. The amyloplast-rich endothelium is partially degraded during the expansion of the micropylar portion of the megagametophyte. Organization of the mature embryo sac is determined by the patterns of vacuolation, nuclear migration, spindle orientation and cellularization. The egg cell is slightly chalazal in relation to the synergids, and its micropylar end does not touch the micropylar channel. At the chalazal pole of the egg apparatus, the common walls between the synergids, the egg and central cells, despite their tenuity, are present in the mature megagametophyte. The polar nuclei do not fuse before fertilization and the antipodals are persistent until the first stages of endosperm formation. The taxonomic significance of some embryological characters for the Bignoniaceae is discussed. |
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Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac developmentEmbryo sacmegagametogenesisfemale germ unitcellularizationTabebuiaThe chalazal megaspore develops in a Polygonum-type embryo sac. The amyloplast-rich endothelium is partially degraded during the expansion of the micropylar portion of the megagametophyte. Organization of the mature embryo sac is determined by the patterns of vacuolation, nuclear migration, spindle orientation and cellularization. The egg cell is slightly chalazal in relation to the synergids, and its micropylar end does not touch the micropylar channel. At the chalazal pole of the egg apparatus, the common walls between the synergids, the egg and central cells, despite their tenuity, are present in the mature megagametophyte. The polar nuclei do not fuse before fertilization and the antipodals are persistent until the first stages of endosperm formation. The taxonomic significance of some embryological characters for the Bignoniaceae is discussed.Sociedade Botânica de São Paulo2002-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200001Brazilian Journal of Botany v.25 n.2 2002reponame:Brazilian Journal of Botanyinstname:Sociedade Botânica de São Paulo (SBSP)instacron:SBSP10.1590/S0100-84042002000200001info:eu-repo/semantics/openAccessBITTENCOURT JR.,NELSON S.MARIATH,JORGE E.A.eng2002-09-08T00:00:00Zoai:scielo:S0100-84042002000200001Revistahttps://www.scielo.br/j/rbb/ONGhttps://old.scielo.br/oai/scielo-oai.phpbrazbot@gmail.com||brazbot@gmail.com1806-99590100-8404opendoar:2002-09-08T00:00Brazilian Journal of Botany - Sociedade Botânica de São Paulo (SBSP)false |
dc.title.none.fl_str_mv |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
title |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
spellingShingle |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development BITTENCOURT JR.,NELSON S. Embryo sac megagametogenesis female germ unit cellularization Tabebuia |
title_short |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
title_full |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
title_fullStr |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
title_full_unstemmed |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
title_sort |
Ovule ontogeny of Tabebuia pulcherrima Sandwith (Bignoniaceae): embryo sac development |
author |
BITTENCOURT JR.,NELSON S. |
author_facet |
BITTENCOURT JR.,NELSON S. MARIATH,JORGE E.A. |
author_role |
author |
author2 |
MARIATH,JORGE E.A. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
BITTENCOURT JR.,NELSON S. MARIATH,JORGE E.A. |
dc.subject.por.fl_str_mv |
Embryo sac megagametogenesis female germ unit cellularization Tabebuia |
topic |
Embryo sac megagametogenesis female germ unit cellularization Tabebuia |
description |
The chalazal megaspore develops in a Polygonum-type embryo sac. The amyloplast-rich endothelium is partially degraded during the expansion of the micropylar portion of the megagametophyte. Organization of the mature embryo sac is determined by the patterns of vacuolation, nuclear migration, spindle orientation and cellularization. The egg cell is slightly chalazal in relation to the synergids, and its micropylar end does not touch the micropylar channel. At the chalazal pole of the egg apparatus, the common walls between the synergids, the egg and central cells, despite their tenuity, are present in the mature megagametophyte. The polar nuclei do not fuse before fertilization and the antipodals are persistent until the first stages of endosperm formation. The taxonomic significance of some embryological characters for the Bignoniaceae is discussed. |
publishDate |
2002 |
dc.date.none.fl_str_mv |
2002-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200001 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0100-84042002000200001 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Botânica de São Paulo |
publisher.none.fl_str_mv |
Sociedade Botânica de São Paulo |
dc.source.none.fl_str_mv |
Brazilian Journal of Botany v.25 n.2 2002 reponame:Brazilian Journal of Botany instname:Sociedade Botânica de São Paulo (SBSP) instacron:SBSP |
instname_str |
Sociedade Botânica de São Paulo (SBSP) |
instacron_str |
SBSP |
institution |
SBSP |
reponame_str |
Brazilian Journal of Botany |
collection |
Brazilian Journal of Botany |
repository.name.fl_str_mv |
Brazilian Journal of Botany - Sociedade Botânica de São Paulo (SBSP) |
repository.mail.fl_str_mv |
brazbot@gmail.com||brazbot@gmail.com |
_version_ |
1754734838098690048 |