Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)

The massulae and pollen grains in pollinia of four palustrine South American species of Habenaria, H. bractescens, H. gourlieana, H. paucifolia and H. secunda were studied here for the first time using light, scanning, and transmission electronic microscopy. The pollinia have acalymmate, piriform or...

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Detalles Bibliográficos
Autores principales: Passarelli, Lilian Mónica, Rolleri, Cristina Hilda
Formato: Articulo
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Botánica
acalymmate massulae
filiform threads
inaperturate pollen grains
calymmate tetrads
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/40464
http://www.tandfonline.com/doi/full/10.1080/00173130903484869#.VCRNfvl5O2U
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-40464
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Botánica
acalymmate massulae
filiform threads
inaperturate pollen grains
calymmate tetrads
spellingShingle Ciencias Naturales
Botánica
acalymmate massulae
filiform threads
inaperturate pollen grains
calymmate tetrads
Passarelli, Lilian Mónica
Rolleri, Cristina Hilda
Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)
topic_facet Ciencias Naturales
Botánica
acalymmate massulae
filiform threads
inaperturate pollen grains
calymmate tetrads
description The massulae and pollen grains in pollinia of four palustrine South American species of Habenaria, H. bractescens, H. gourlieana, H. paucifolia and H. secunda were studied here for the first time using light, scanning, and transmission electronic microscopy. The pollinia have acalymmate, piriform or tabular massulae. Filiform elastoviscin threads are formed between the pollen grains of pollinia, allowing them to stick together. The pollen grains are inaperturate, grouped into calymmate tetrads, and have reticulate or reticulum-like, heterobrochate exine. Reticulate ornamentation consists of irregular, rounded, wide or narrow, continuous muri, while reticulum-like ornamentation is formed by discontinuous, partial muri, superficially smooth or with spherical micro-granules, intermingling with some isolated elements that can be interpreted as pila. The wall structure of individual pollen grains differs according to their position in the tetrads: outside walls develop complete exine and intine, with columellae, while the walls inside the pollinium lack exine or develop only a much reduced one. Palynological characters differentiate the species: pyriform massulae, triangular in outline, occur in H. gourlieana, H. paucifolia and H. secunda, while tabular massulae, oblong in outline, characterise H. bractescens. Ornamentation also distinguishes H. gourlieana grains, with interrupted, discontinuous muri, from the other three species, bearing reticulate grains. Elastoviscin filiform threads, which were found to be lipidic in nature, are simple or ramified, and some bear pores (in H. bractescens). Branched filiform threads characterise H. bractescens and H. secunda, while unbranched, filiform threads correspond to H. gourlieana and H. paucifolia.
format Articulo
Articulo
author Passarelli, Lilian Mónica
Rolleri, Cristina Hilda
author_facet Passarelli, Lilian Mónica
Rolleri, Cristina Hilda
author_sort Passarelli, Lilian Mónica
title Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)
title_short Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)
title_full Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)
title_fullStr Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)
title_full_unstemmed Pollen grains and pollinia in four Southamerican palustrine species of <i>Habenaria</i> (Orchidaceae)
title_sort pollen grains and pollinia in four southamerican palustrine species of <i>habenaria</i> (orchidaceae)
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/40464
http://www.tandfonline.com/doi/full/10.1080/00173130903484869#.VCRNfvl5O2U
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AT rollericristinahilda pollengrainsandpolliniainfoursouthamericanpalustrinespeciesofihabenariaiorchidaceae
bdutipo_str Repositorios
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