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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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 |
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DIOECY FLOWER MORPHS ANATOMY ANTHER POLLEN GRAINS ULTRASTRUCTURE DIOECY FLOWER MORPHS ANATOMY ANTHER POLLEN GRAINS ULTRASTRUCTURE |
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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 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= http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber= |
work_keys_str_mv |
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1762927469132775424 |