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AOBPreview originally published online on November 18, 2005
Annals of Botany 2006 97(2):239-244; doi:10.1093/aob/mcj022
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Pollen-wall Formation in Arum alpinum

ELISABETH M. ANGER* and MARTINA WEBER

Department of Palynology and Structural Botany, Institute of Botany, University of Vienna, Rennweg 14, A-1030 Vienna, Austria

* For correspondence. E-mail martina.weber{at}univie.ac.at

Received: 29 July 2005    Returned for revision: 31 August 2005    Accepted: 11 October 2005    Published electronically: 18 November 2005

• Background and Aims Arum alpinum has a quite uncommon pollen wall. A sporopolleninous ektexine is missing. The outermost pollen wall layer is formed by the endexine which is covered by polysaccharidic ornamentation elements. An ontogenetical investigation was accomplished to clarify pollen-wall development, with special reference to callose and pollen-wall development.

• Methods Plants of Arum alpinum grown in their natural habitat were collected once a week within the vegetative period and processed for semi- and ultra-thin sectioning.

• Key Results At any stage of pollen-wall formation callose is missing. Microspores are released from the tetrad by invagination of the amoeboid tapetum. The polysaccharidic wall ornamentations are formed by the tapetum.

• Conclusions There appears to be no truth in the dogma that callose is essential for microspore separation and release from the tetrad. The lack of callose does not influence fertility but could be the reason for the uncommon pollen wall, where a sporopolleninous ektexine is missing.

Key words: Araceae, Arum alpinum, callose, pollen, spines, tapetum


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