Unique aperture stratification in Carex (Cyperaceae) pollen

Autor(en)

Heidemarie Halbritter, Martina Weber, Michael Hesse

Abstrakt

Mature pollen usually has a conspicuously thick intine in the aperture regions, whereas in the interapertural area(s) the intine is thin. In Carex (and in other Cyperaceae with pseudomonads), usually five to six circular or elongated apertures (poroids) are present, one situated distally and the others equatorially. In the species studied here the situation is opposite: the apertures (poroids) are characterised by a very thin intine, whereas in the interapertural area(s) the intine is conspicuously thickened. A similar condition is only known for Vinca (Apocynaceae). A second unusual sporoderm feature in Carex relates to the foot layer. In the interapertural area(s) the foot layer is thin and discontinuous. The equatorial poroids exhibit a compact, thick and homogeneous foot layer, whereas the distal poroid is distinguished by an elaborated foot layer, structurally similar to a transfer-cell wall labyrinth. This unique elaborated foot layer in the distal poroid probably functions as a nutrimental passage between the tapetum and the maturing pollen. The pseudomonads are usually pear-shaped, sometimes spherical. Ornamenting elements are microechini, granules, and perforations, all sometimes placed on verrucae.

Organisation(en)

Journal

Grana: an international journal of palynology and aerobiology with world pollen and spore flora

Band

49

Seiten

1-11

Anzahl der Seiten

11

ISSN

0017-3134

DOI

https://doi.org/10.1080/00173130903566723

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

1060 Biologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/269e0a06-bfa0-415a-b44c-0cb0fc54e5e2