Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development

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Background: The inflorescences of the genus Vigna Savi have extrafloral nectaries (EFNs) among the flowers whose origin is still unknown. The disposition, anatomy and morphology, as well as the ontogeny of the extrafloral nectaries (EFNs) associated with the inflorescences of Vigna adenantha (G.F.W....

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Autores principales: Ojeda, Fabiana Soledad, Hoc, Patricia Susana, Galati, Beatriz Gloria
Publicado: 2014
Materias:
Anatomy
Extrafloral nectaries
Inflorescences
Leguminosae
Morphology
Ontogeny
Ultrastructure
Vigna
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1817406X_v55_n1_p_Ojeda
http://hdl.handle.net/20.500.12110/paper_1817406X_v55_n1_p_Ojeda
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_1817406X_v55_n1_p_Ojeda2023-06-08T16:29:15Z Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development Ojeda, Fabiana Soledad Hoc, Patricia Susana Galati, Beatriz Gloria Anatomy Extrafloral nectaries Inflorescences Leguminosae Morphology Ontogeny Ultrastructure Vigna Background: The inflorescences of the genus Vigna Savi have extrafloral nectaries (EFNs) among the flowers whose origin is still unknown. The disposition, anatomy and morphology, as well as the ontogeny of the extrafloral nectaries (EFNs) associated with the inflorescences of Vigna adenantha (G.F.W. Meyer) Maréchal, Mascherpa & Stainier (Leguminosae, Papilionoideae, Phaseolae) were studied. Besides, the ultrastructure of the secretory stage was described. Results: The inflorescence, a raceme, bears a brief globose secondary axis in each node with 2 flowers and 5–7 EFNs, which develop in acropetal direction. Each EFN originates from the abscission of a flower bud that interrupts its development, resulting in an elevated EFN. This secretory structure is formed by a ring of epidermal and parenchymatic cells surrounding a group of elongated central cells. The nectary is irrigated by phloem and xylem. Four developmental stages proceed; each one relates to a different embryological stage of the flowers in each secondary axis. Conclusions: The first functional EFN of each secondary axis of the inflorescence reaches its maturity when both the pollen grains and the embryo sacs are completely developed and the flowers begin to open. The secretion is granulocrine. The following EFNs develop in the same way. © 2014, Ojeda et al.; licensee Springer. Fil:Ojeda, F.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Hoc, P.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Galati, B.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2014 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1817406X_v55_n1_p_Ojeda http://hdl.handle.net/20.500.12110/paper_1817406X_v55_n1_p_Ojeda
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Anatomy
Extrafloral nectaries
Inflorescences
Leguminosae
Morphology
Ontogeny
Ultrastructure
Vigna
spellingShingle Anatomy
Extrafloral nectaries
Inflorescences
Leguminosae
Morphology
Ontogeny
Ultrastructure
Vigna
Ojeda, Fabiana Soledad
Hoc, Patricia Susana
Galati, Beatriz Gloria
Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development
topic_facet Anatomy
Extrafloral nectaries
Inflorescences
Leguminosae
Morphology
Ontogeny
Ultrastructure
Vigna
description Background: The inflorescences of the genus Vigna Savi have extrafloral nectaries (EFNs) among the flowers whose origin is still unknown. The disposition, anatomy and morphology, as well as the ontogeny of the extrafloral nectaries (EFNs) associated with the inflorescences of Vigna adenantha (G.F.W. Meyer) Maréchal, Mascherpa & Stainier (Leguminosae, Papilionoideae, Phaseolae) were studied. Besides, the ultrastructure of the secretory stage was described. Results: The inflorescence, a raceme, bears a brief globose secondary axis in each node with 2 flowers and 5–7 EFNs, which develop in acropetal direction. Each EFN originates from the abscission of a flower bud that interrupts its development, resulting in an elevated EFN. This secretory structure is formed by a ring of epidermal and parenchymatic cells surrounding a group of elongated central cells. The nectary is irrigated by phloem and xylem. Four developmental stages proceed; each one relates to a different embryological stage of the flowers in each secondary axis. Conclusions: The first functional EFN of each secondary axis of the inflorescence reaches its maturity when both the pollen grains and the embryo sacs are completely developed and the flowers begin to open. The secretion is granulocrine. The following EFNs develop in the same way. © 2014, Ojeda et al.; licensee Springer.
author Ojeda, Fabiana Soledad
Hoc, Patricia Susana
Galati, Beatriz Gloria
author_facet Ojeda, Fabiana Soledad
Hoc, Patricia Susana
Galati, Beatriz Gloria
author_sort Ojeda, Fabiana Soledad
title Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development
title_short Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development
title_full Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development
title_fullStr Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development
title_full_unstemmed Ontogeny of the extrafloral nectaries of Vigna adenantha (Leguminosae, Phaseolae) and its relation with floral development
title_sort ontogeny of the extrafloral nectaries of vigna adenantha (leguminosae, phaseolae) and its relation with floral development
publishDate 2014
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1817406X_v55_n1_p_Ojeda
http://hdl.handle.net/20.500.12110/paper_1817406X_v55_n1_p_Ojeda
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