Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)

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The structure and ultrastructure of the floral nectary of staminate and pistillate flowers of Koelreuteria elegans subsp. formosana (Sapindaceae, Koelreuterieae) were studied. In both floral morphs, the floral nectary is extrastaminal, receptacular, thimble-shaped and persistent. The anatomical an...

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Autores principales: Ávalos, Adán Alberto, Lattar, Elsa Clorinda, Galati, Beatriz Gloria, Ferrucci, María Silvia
Formato: Artículo
Lenguaje:Inglés
Publicado: Elsevier Gmbh 2021
Materias:
Ultrastructure
Koelreuterieae
Flower nectary
Nectarostomata
Nectar secretion
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/30334
Aporte de:
RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
id I48-R184-123456789-30334
record_format dspace
spelling I48-R184-123456789-303342024-10-10T12:53:33Z Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae) Ávalos, Adán Alberto Lattar, Elsa Clorinda Galati, Beatriz Gloria Ferrucci, María Silvia Ultrastructure Koelreuterieae Flower nectary Nectarostomata Nectar secretion The structure and ultrastructure of the floral nectary of staminate and pistillate flowers of Koelreuteria elegans subsp. formosana (Sapindaceae, Koelreuterieae) were studied. In both floral morphs, the floral nectary is extrastaminal, receptacular, thimble-shaped and persistent. The anatomical analysis revealed a differentiated secretory parenchyma and a less developed, inner non-secretory parenchyma. These anatomical features reveal that the nectary is structured, and is supplied by phloem traces derived from the central stele. In the middle of the floral nectary there are few modified stomata. The nectarostomata were of anomocytic type;they may occur atthe level of or sunken below the adjacent epidermal cells. Sta tistically significant differences were observed between both floral morphs in relation to nectar volume and the different moments of day, whereas the sugar concentration showed no significant differences. Ultrastructural studies showed no difference between staminate and pistillate flowers. At anthesis, amy loplasts and lipid globules were observed in the secretory parenchyma cells, whereas at post-anthesis the secretory parenchyma cells were degenerated. Floral nectar is secreted through nectarostomata and the outer epidermal cell walls. These results are discussed in relation to other species belonging to different tribes within Sapindaceae 2021-12-09T16:37:46Z 2021-12-09T16:37:46Z 2017 Artículo Avalos, Adán Alberto, et al., 2017. Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae). Flora. Berlin: Elsevier Gmbh, vol. 226, p. 29-37. ISSN 0367-2530. 0367-2530 http://repositorio.unne.edu.ar/handle/123456789/30334 eng https://www.sciencedirect.com/science/article/abs/pii/S0367253016301633?via%3Dihub openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf application/pdf Elsevier Gmbh Flora, 2017, vol. 226, p. 29-37.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
topic Ultrastructure
Koelreuterieae
Flower nectary
Nectarostomata
Nectar secretion
spellingShingle Ultrastructure
Koelreuterieae
Flower nectary
Nectarostomata
Nectar secretion
Ávalos, Adán Alberto
Lattar, Elsa Clorinda
Galati, Beatriz Gloria
Ferrucci, María Silvia
Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
topic_facet Ultrastructure
Koelreuterieae
Flower nectary
Nectarostomata
Nectar secretion
description The structure and ultrastructure of the floral nectary of staminate and pistillate flowers of Koelreuteria elegans subsp. formosana (Sapindaceae, Koelreuterieae) were studied. In both floral morphs, the floral nectary is extrastaminal, receptacular, thimble-shaped and persistent. The anatomical analysis revealed a differentiated secretory parenchyma and a less developed, inner non-secretory parenchyma. These anatomical features reveal that the nectary is structured, and is supplied by phloem traces derived from the central stele. In the middle of the floral nectary there are few modified stomata. The nectarostomata were of anomocytic type;they may occur atthe level of or sunken below the adjacent epidermal cells. Sta tistically significant differences were observed between both floral morphs in relation to nectar volume and the different moments of day, whereas the sugar concentration showed no significant differences. Ultrastructural studies showed no difference between staminate and pistillate flowers. At anthesis, amy loplasts and lipid globules were observed in the secretory parenchyma cells, whereas at post-anthesis the secretory parenchyma cells were degenerated. Floral nectar is secreted through nectarostomata and the outer epidermal cell walls. These results are discussed in relation to other species belonging to different tribes within Sapindaceae
format Artículo
author Ávalos, Adán Alberto
Lattar, Elsa Clorinda
Galati, Beatriz Gloria
Ferrucci, María Silvia
author_facet Ávalos, Adán Alberto
Lattar, Elsa Clorinda
Galati, Beatriz Gloria
Ferrucci, María Silvia
author_sort Ávalos, Adán Alberto
title Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
title_short Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
title_full Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
title_fullStr Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
title_full_unstemmed Nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
title_sort nectary structure and ultrastructure in two floral morphs of koelreuteria elegans subsp. formosana (sapindaceae)
publisher Elsevier Gmbh
publishDate 2021
url http://repositorio.unne.edu.ar/handle/123456789/30334
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