scholarly journals A contribution to the knowledge of exine ultrastructure in subtribeAnisopappinae(Athroismeae, Asteraceae)

2014 ◽  
Vol 44 (3) ◽  
pp. 431-437 ◽  
Author(s):  
António Pereira Coutinho ◽  
Santiago Ortiz ◽  
Mariana Valente ◽  
Rita França ◽  
Margarida Soares
Keyword(s):  
Exine Ultrastructure

Morphologie et ultrastructure du pollen dans le genre Utricularia L. (Lentibulariaceae)

1999 ◽  
Vol 77 (5) ◽  
pp. 744-767
Author(s):  
Danielle Lobreau-Callen ◽  
Joël Jérémie ◽  
Maria Suarez-Cervera
Keyword(s):  
Pollen Morphology ◽  
Evolutionary History ◽  
The Other ◽  
Aquatic Species ◽  
Flowing Water ◽  
Pollen Types ◽  
Exine Ultrastructure ◽  
History Of ◽  
Palynological Study

This palynological study of the genus Utricularia (Lentibulariaceae) deals with 39 species spread through 26 of the 35 sections that compose the genus. The pollen varies from tricolporate to zonocolporate or to zonoporate. The tectum is smooth, rarely ornamented (SEM). Nine pollen types are distinguished of which six have been studied with the TEM. The tectum is regular, the infratectum generally granular. The foot-layer is thick if the number of apertures is reduced and thin or absent if the endoapertures form an endocingulum. The endexine is thick if the foot-layer is thin, and made up of lamellae and rarely of costae bordering the endoapertures. In the porate pollen, the foot-layer and endexine are absent. Diverse in the terrestrial and lithophytic species, the pollen tends to be oblate and planaperturate in the epiphytes, zonocolporate with numerous apertures in the floating aquatic species, and ornamented in those of flowing water. The species considered the most primitive are terrestrial with tricolporate pollen. All the other types are derived, especially those with a significant increase in the number of apertures, associated or not with the absence of a foot-layer or an endexine. In the genus Utricularia and the Lentibulariaceae in general, the variation in pollen is much less related to habitat than to the evolutionary history of each species.Key words: pollen, morphology, exine, ultrastructure, Utricularia, Lentibulariaceae.

Comparative study of pollen morphology and exine ultrastructure in tetrads, octads and polyads of the genus Mimosa (Leguminosae)

Palynology ◽  
2018 ◽  
Vol 43 (2) ◽  
pp. 188-212
Author(s):  
Montserrath Medina-Acosta ◽  
Rosaura Grether ◽  
Angélica Martínez-Bernal ◽  
Elia Ramírez-Arriaga
Keyword(s):  
Comparative Study ◽  
Pollen Morphology ◽  
Exine Ultrastructure

Exine ultrastructure in pollen grains of Classopollis Pflug from the Cretaceous of Lebanon

2010 ◽  
Vol 44 (10) ◽  
pp. 1353-1367 ◽  
Author(s):  
N. E. Zavialova ◽  
M. V. Tekleva ◽  
S. B. Smirnova ◽  
M. Mroueh
Keyword(s):  
Pollen Grains ◽  
Exine Ultrastructure

Exine Ultrastructure of Myrtaceous Pollen

1982 ◽  
Vol 30 (1) ◽  
pp. 75 ◽  
Author(s):  
PA Gadek ◽  
HA Martin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Species Differences ◽  
Transmission Electron Microscopy Analysis ◽  
Transmission Electron ◽  
Exine Ultrastructure ◽  
Electron Microscopy Analysis ◽  
Thin Electron ◽  
Microscopy Analysis ◽  
Scanning Electron

Exine ultrastructure has been determined by transmission electron microscopy analysis of the grains of a number of species of Myrtaceae, chosen to represent some of the diversity of sculpture and structure that can be observed using light microscopy and scanning electron microscopy. The species all show a typical angiosperm exine differentiation consisting of two chemically different layers, an electron-dense ektexine and a less dense endexine divided by a very thin electron-transparent lamella. They all differ, however, from the typical angiosperm architecture by the presence of a somewhat unstructured, granulate infratectal layer and a granular/alveolate endexinous layer around the pores. Species differences relate to the granulate coiumellate organization of the infractectal layer, the extent or density of tectal perforations and the presence and thickness of a foot layer around the grain.

scholarly journals Palynotaxonomy of the genus Gladiopappus (Dicomeae, Asteraceae) with special emphasis on the exine ultrastructure and mesoapertures

2018 ◽  
Vol 63 (2) ◽  
pp. 102-108
Author(s):  
A. Pereira Coutinho ◽  
D. Sá da Bandeira ◽  
L. Currais ◽  
E. Soukiazes ◽  
S. Ortiz
Keyword(s):  
Exine Ultrastructure

The exine ultrastructure of Plicatipollenites Lele 1964

2006 ◽  
Vol 139 (1-4) ◽  
pp. 241-252 ◽  
Author(s):  
Natalia E. Zavialova ◽  
Michael H. Stephenson
Keyword(s):  
Exine Ultrastructure

Notes on the exine ultrastructure of Onagraceae and Rhododendroideae (Ericaceae)

Grana ◽  
1992 ◽  
Vol 31 (2) ◽  
pp. 119-123 ◽  
Author(s):  
Christian Keri ◽  
Reinhard Zetter
Keyword(s):  
Exine Ultrastructure
Sign in / Sign up

Export Citation Format

Share Document