Pollen, Tapetum, and Orbicule Development in Colletia paradoxa and Discaria americana RhamnaceaeReport as inadecuate




Pollen, Tapetum, and Orbicule Development in Colletia paradoxa and Discaria americana Rhamnaceae - Download this document for free, or read online. Document in PDF available to download.

The Scientific World JournalVolume 2012 2012, Article ID 948469, 8 pages

Research ArticleGrupo de Biología Reproductiva en Plantas Superiores, Cátedra de Botánica Agrícola, Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, 1417 Buenos Aires, Argentina

Received 24 October 2011; Accepted 8 December 2011

Academic Editor: Harsh P. Bais

Copyright © 2012 M. Gotelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Tapetum, orbicule, and pollen grain ontogeny in Colletia paradoxa and Discaria americana were studied with transmission electron microscopy TEM. The ultrastructural changes observed during the different stages of development in the tapetal cells and related to orbicule and pollen grain formation are described. The proorbicules have the appearance of lipid globule, and their formation is related to the endoplasmic reticulum of rough type ERr. This is the first report on the presence of orbicules in the family Rhamnaceae. Pollen grains are shed at the bicellular stage.





Author: M. Gotelli, B. Galati, and D. Medan

Source: https://www.hindawi.com/



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