Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)

The ontogeny of the ovule and megasporogenesis in Jacaranda mimosifolia D. Don. was investigated. There is no previous account about ovular initiation in the family Bignoniaceae. The mature ovule is anatropous, unitegmic and tenuinucellate. The ovular primordium is bizonate and the integument is of...

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Guardado en:
Detalles Bibliográficos
Publicado: 1999
Materias:
Callose
Development
Jacaranda
Megagametophyte
Megaspore
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319449_v49_n1_p67_Galati
http://hdl.handle.net/20.500.12110/paper_00319449_v49_n1_p67_Galati
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00319449_v49_n1_p67_Galati
record_format dspace
spelling paper:paper_00319449_v49_n1_p67_Galati2023-06-08T14:59:44Z Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae) Callose Development Jacaranda Megagametophyte Megaspore The ontogeny of the ovule and megasporogenesis in Jacaranda mimosifolia D. Don. was investigated. There is no previous account about ovular initiation in the family Bignoniaceae. The mature ovule is anatropous, unitegmic and tenuinucellate. The ovular primordium is bizonate and the integument is of dermal origin. Cytoplasm is highly concentrated at the chalazal pole of the megaspore mother cell which undergoes meiosis; this polarity may be related with the selection of the functional megaspore. Linear or T-shaped tetrads of megaspores are formed of which the lowermost is functional and produces an Polygonum type of embryo sac. During the course of megasporogenesis, callose appears only along the transverse walls in dyads and tetrads. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319449_v49_n1_p67_Galati http://hdl.handle.net/20.500.12110/paper_00319449_v49_n1_p67_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 Callose
Development
Jacaranda
Megagametophyte
Megaspore
spellingShingle Callose
Development
Jacaranda
Megagametophyte
Megaspore
Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)
topic_facet Callose
Development
Jacaranda
Megagametophyte
Megaspore
description The ontogeny of the ovule and megasporogenesis in Jacaranda mimosifolia D. Don. was investigated. There is no previous account about ovular initiation in the family Bignoniaceae. The mature ovule is anatropous, unitegmic and tenuinucellate. The ovular primordium is bizonate and the integument is of dermal origin. Cytoplasm is highly concentrated at the chalazal pole of the megaspore mother cell which undergoes meiosis; this polarity may be related with the selection of the functional megaspore. Linear or T-shaped tetrads of megaspores are formed of which the lowermost is functional and produces an Polygonum type of embryo sac. During the course of megasporogenesis, callose appears only along the transverse walls in dyads and tetrads.
title Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)
title_short Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)
title_full Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)
title_fullStr Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)
title_full_unstemmed Ovule ontogeny and megasporogenesis in Jacaranda mimosifolia D.Don. (Bignoniaceae)
title_sort ovule ontogeny and megasporogenesis in jacaranda mimosifolia d.don. (bignoniaceae)
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00319449_v49_n1_p67_Galati
http://hdl.handle.net/20.500.12110/paper_00319449_v49_n1_p67_Galati
_version_ 1768544629653766144

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