Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore
! Background and Aims The generic delimitations of Ficinia and Isolepis, sister genera in the Cypereae, are blurred. Typical Ficinia flowers have a lobed gynophore, which envelops the base of the nutlet, whereas in Isolepis the character is considered to be absent. Some former species of Isolepis, l...
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ftnaturalis:oai:naturalis:407286 2023-05-15T13:49:13+02:00 Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore Vrijdaghs, H. Goetghebeur, P. Muasya, A.M. Caris, P. Smets, E. 2005 application/pdf http://www.repository.naturalis.nl/record/407286 http://www.repository.naturalis.nl/document/351554 unknown http://www.repository.naturalis.nl/record/407286 http://www.repository.naturalis.nl/document/351554 (c) Naturalis Various articles (0305-7364) vol.96 (2005) p.1247 Ficinia floral ontogeny gynophore Isolepis scanning electron microscopy Article / Letter to the editor 2005 ftnaturalis 2022-09-01T06:22:48Z ! Background and Aims The generic delimitations of Ficinia and Isolepis, sister genera in the Cypereae, are blurred. Typical Ficinia flowers have a lobed gynophore, which envelops the base of the nutlet, whereas in Isolepis the character is considered to be absent. Some former species of Isolepis, lacking the gynophore, were recently included in Ficinia. The floral ontogeny of representative taxa in Ficinia and Isolepis were investigated with the aim of evaluating the origin and nature of the gynophore in the Cypereae. ! Methods The spikelet and floral ontogeny in inflorescences collected in the field was investigated using scanning electron microscopy (SEM) and light microscopy (LM). ! Key Results SEM images of Isolepis setacea and I. antarctica, Ficinia brevifolia, F. minutiflora, F. zeyheri and F. gracilis, and LM sections of F. radiata, show that the gynoecium in Ficinia is elevated above the flower receptacle by the development of a hypogynous stalk. From its apex, a (often three-)lobed cup is formed, which envelopes the basal part of the later nutlet. In developing flowers of I. antarctica, a rudimentary hypogynous stalk appears. In I. setacea, rudiments of a hypogynous stalk can be observed at maturity. In F. radiata and F. zeyheri, intralocular hairs are present in the micropylar zone. At the surface of developing gynoecia in flowers of F. gracilis, star-shaped cuticular structures appear which disappear again at maturity. ! Conclusions The overall floral ontogeny of all species studied occurs following a typical scirpoid pattern, though no perianth primordia are formed. The gynophore in Ficinia originates as a hypogynous stalk, from which the typical gynophore lobes develop. The gynophore is not homologous with the perianth. Article in Journal/Newspaper Antarc* Antarctica Naturalis Digital Academic Repository (National Museum of Natural History in the Netherlands) |
institution |
Open Polar |
collection |
Naturalis Digital Academic Repository (National Museum of Natural History in the Netherlands) |
op_collection_id |
ftnaturalis |
language |
unknown |
topic |
Ficinia floral ontogeny gynophore Isolepis scanning electron microscopy |
spellingShingle |
Ficinia floral ontogeny gynophore Isolepis scanning electron microscopy Vrijdaghs, H. Goetghebeur, P. Muasya, A.M. Caris, P. Smets, E. Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore |
topic_facet |
Ficinia floral ontogeny gynophore Isolepis scanning electron microscopy |
description |
! Background and Aims The generic delimitations of Ficinia and Isolepis, sister genera in the Cypereae, are blurred. Typical Ficinia flowers have a lobed gynophore, which envelops the base of the nutlet, whereas in Isolepis the character is considered to be absent. Some former species of Isolepis, lacking the gynophore, were recently included in Ficinia. The floral ontogeny of representative taxa in Ficinia and Isolepis were investigated with the aim of evaluating the origin and nature of the gynophore in the Cypereae. ! Methods The spikelet and floral ontogeny in inflorescences collected in the field was investigated using scanning electron microscopy (SEM) and light microscopy (LM). ! Key Results SEM images of Isolepis setacea and I. antarctica, Ficinia brevifolia, F. minutiflora, F. zeyheri and F. gracilis, and LM sections of F. radiata, show that the gynoecium in Ficinia is elevated above the flower receptacle by the development of a hypogynous stalk. From its apex, a (often three-)lobed cup is formed, which envelopes the basal part of the later nutlet. In developing flowers of I. antarctica, a rudimentary hypogynous stalk appears. In I. setacea, rudiments of a hypogynous stalk can be observed at maturity. In F. radiata and F. zeyheri, intralocular hairs are present in the micropylar zone. At the surface of developing gynoecia in flowers of F. gracilis, star-shaped cuticular structures appear which disappear again at maturity. ! Conclusions The overall floral ontogeny of all species studied occurs following a typical scirpoid pattern, though no perianth primordia are formed. The gynophore in Ficinia originates as a hypogynous stalk, from which the typical gynophore lobes develop. The gynophore is not homologous with the perianth. |
format |
Article in Journal/Newspaper |
author |
Vrijdaghs, H. Goetghebeur, P. Muasya, A.M. Caris, P. Smets, E. |
author_facet |
Vrijdaghs, H. Goetghebeur, P. Muasya, A.M. Caris, P. Smets, E. |
author_sort |
Vrijdaghs, H. |
title |
Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore |
title_short |
Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore |
title_full |
Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore |
title_fullStr |
Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore |
title_full_unstemmed |
Floral Ontogeny in Ficinia and Isolepis (Cyperaceae), with Focus on the Nature and Origin of the Gynophore |
title_sort |
floral ontogeny in ficinia and isolepis (cyperaceae), with focus on the nature and origin of the gynophore |
publishDate |
2005 |
url |
http://www.repository.naturalis.nl/record/407286 http://www.repository.naturalis.nl/document/351554 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Various articles (0305-7364) vol.96 (2005) p.1247 |
op_relation |
http://www.repository.naturalis.nl/record/407286 http://www.repository.naturalis.nl/document/351554 |
op_rights |
(c) Naturalis |
_version_ |
1766251017327869952 |