Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family

Anther and pollen development in staminate and pistillate flowers of dioecious Melicoccus lepidopetalus (Sapindaceae) were examined by light and electron microscopy. Young anthers are similar in both types of flowers; they consist of epidermis, endothecium, two to four middle layers and a secretory tapetum. The microspore tetrads are tetrahedral. The mature anther in staminate flowers presents compressed epidermal cells and endothecium cells with fibrillar thickenings. A single locule is formed in the theca by dissolution of the septum and pollen grains are shed at two-celled stage. The mature anthers of pistillate flowers differ anatomically from those of staminate flowers. The epidermis is not compressed, the endothecium does not develop fibrillar thickenings, middle layers and tapetum are generally persisting, and the stomium is nonfunctional. Microspore degeneration begins after meiosis of microspore mother cells. At anthesis, uninucleate microspores and pollen grains with vegetative and generative nuclei with no cytokinesis are observed. Some pollen walls display an abnormal exine deposition, whereas others show a well formed exine, although both are devoid of intine. These results suggest that in the evolution towards unisexuality, the developmental differences of anther wall tissues and pollen grains between pistillate and staminate flowers might become more pronounced in a derived condition, such as dioecy.

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Main Authors: Zini, Lucía Melisa, Galati, Beatriz Gloria, Solís, Stella Maris, Ferrucci, María Silvia
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Language:e
Subjects:DIOECY, FLOWER MORPHS, ANATOMY, ANTHER, POLLEN GRAINS, ULTRASTRUCTURE, ,
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spelling KOHA-OAI-AGRO:453582023-03-29T15:08:09Zhttp://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=45358http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=AAGAnther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the familyZini, Lucía MelisaGalati, Beatriz GloriaSolís, Stella MarisFerrucci, María Silviatexte application/pdfAnther and pollen development in staminate and pistillate flowers of dioecious Melicoccus lepidopetalus (Sapindaceae) were examined by light and electron microscopy. Young anthers are similar in both types of flowers; they consist of epidermis, endothecium, two to four middle layers and a secretory tapetum. The microspore tetrads are tetrahedral. The mature anther in staminate flowers presents compressed epidermal cells and endothecium cells with fibrillar thickenings. A single locule is formed in the theca by dissolution of the septum and pollen grains are shed at two-celled stage. The mature anthers of pistillate flowers differ anatomically from those of staminate flowers. The epidermis is not compressed, the endothecium does not develop fibrillar thickenings, middle layers and tapetum are generally persisting, and the stomium is nonfunctional. Microspore degeneration begins after meiosis of microspore mother cells. At anthesis, uninucleate microspores and pollen grains with vegetative and generative nuclei with no cytokinesis are observed. Some pollen walls display an abnormal exine deposition, whereas others show a well formed exine, although both are devoid of intine. These results suggest that in the evolution towards unisexuality, the developmental differences of anther wall tissues and pollen grains between pistillate and staminate flowers might become more pronounced in a derived condition, such as dioecy.Anther and pollen development in staminate and pistillate flowers of dioecious Melicoccus lepidopetalus (Sapindaceae) were examined by light and electron microscopy. Young anthers are similar in both types of flowers; they consist of epidermis, endothecium, two to four middle layers and a secretory tapetum. The microspore tetrads are tetrahedral. The mature anther in staminate flowers presents compressed epidermal cells and endothecium cells with fibrillar thickenings. A single locule is formed in the theca by dissolution of the septum and pollen grains are shed at two-celled stage. The mature anthers of pistillate flowers differ anatomically from those of staminate flowers. The epidermis is not compressed, the endothecium does not develop fibrillar thickenings, middle layers and tapetum are generally persisting, and the stomium is nonfunctional. Microspore degeneration begins after meiosis of microspore mother cells. At anthesis, uninucleate microspores and pollen grains with vegetative and generative nuclei with no cytokinesis are observed. Some pollen walls display an abnormal exine deposition, whereas others show a well formed exine, although both are devoid of intine. These results suggest that in the evolution towards unisexuality, the developmental differences of anther wall tissues and pollen grains between pistillate and staminate flowers might become more pronounced in a derived condition, such as dioecy.DIOECYFLOWER MORPHSANATOMYANTHERPOLLEN GRAINSULTRASTRUCTUREFlora : Morphology, Distribution, Functional Ecology of Plants
institution UBA FA
collection Koha
country Argentina
countrycode AR
component Bibliográfico
access En linea
En linea
databasecode cat-ceiba
tag biblioteca
region America del Sur
libraryname Biblioteca Central FAUBA
language e
topic DIOECY
FLOWER MORPHS
ANATOMY
ANTHER
POLLEN GRAINS
ULTRASTRUCTURE

DIOECY
FLOWER MORPHS
ANATOMY
ANTHER
POLLEN GRAINS
ULTRASTRUCTURE
spellingShingle DIOECY
FLOWER MORPHS
ANATOMY
ANTHER
POLLEN GRAINS
ULTRASTRUCTURE

DIOECY
FLOWER MORPHS
ANATOMY
ANTHER
POLLEN GRAINS
ULTRASTRUCTURE
Zini, Lucía Melisa
Galati, Beatriz Gloria
Solís, Stella Maris
Ferrucci, María Silvia
Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family
description Anther and pollen development in staminate and pistillate flowers of dioecious Melicoccus lepidopetalus (Sapindaceae) were examined by light and electron microscopy. Young anthers are similar in both types of flowers; they consist of epidermis, endothecium, two to four middle layers and a secretory tapetum. The microspore tetrads are tetrahedral. The mature anther in staminate flowers presents compressed epidermal cells and endothecium cells with fibrillar thickenings. A single locule is formed in the theca by dissolution of the septum and pollen grains are shed at two-celled stage. The mature anthers of pistillate flowers differ anatomically from those of staminate flowers. The epidermis is not compressed, the endothecium does not develop fibrillar thickenings, middle layers and tapetum are generally persisting, and the stomium is nonfunctional. Microspore degeneration begins after meiosis of microspore mother cells. At anthesis, uninucleate microspores and pollen grains with vegetative and generative nuclei with no cytokinesis are observed. Some pollen walls display an abnormal exine deposition, whereas others show a well formed exine, although both are devoid of intine. These results suggest that in the evolution towards unisexuality, the developmental differences of anther wall tissues and pollen grains between pistillate and staminate flowers might become more pronounced in a derived condition, such as dioecy.
format Texto
topic_facet
DIOECY
FLOWER MORPHS
ANATOMY
ANTHER
POLLEN GRAINS
ULTRASTRUCTURE
author Zini, Lucía Melisa
Galati, Beatriz Gloria
Solís, Stella Maris
Ferrucci, María Silvia
author_facet Zini, Lucía Melisa
Galati, Beatriz Gloria
Solís, Stella Maris
Ferrucci, María Silvia
author_sort Zini, Lucía Melisa
title Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family
title_short Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family
title_full Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family
title_fullStr Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family
title_full_unstemmed Anther structure and pollen development in Melicoccus lepidopetalus (Sapindaceae) an evolutionary approach to dioecy in the family
title_sort anther structure and pollen development in melicoccus lepidopetalus (sapindaceae) an evolutionary approach to dioecy in the family
url http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=45358
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