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Abstract Detail


Developmental and Structural Section

Galati, Beatriz Gloria [1], Rosenfeldt, Sonia [1], Strittmatter, Lara [1], Lovisolo, Marcelo [1], Gotelli, Marina Marķa [1].

Orbicules morphology in Angiosperms: an approach to their classification.

THE orbicules can be defined as corpuscules of variable size (0,14-20 µm) that show the same reaction to the dyes, electron density, autofluorescence and resistance to acetolysis as pollen exine does. In this work, their morphology, arrangement, ontogeny and ultrastructure are described. Nine orbicules type are defined according to the external morphology (SEM) and three types according to the internal morphology (TEM). The orbicules are randomly dispersed on the inner locule surface, and often closely attached to a tapetal or peritapetal membrane. We conclude that the orbicules are a product of tapetal activity, and the endoplasmic reticulum of rough type (ERr) is the organelle involved in their synthesis. Moreover, these bodies are not exclusive of a special tapetum type, they can be present either in the secretory, plasmodial or intermediate type.


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1 - Universidad de Buenos Aires, Biodiversidad y Biologia Experimental, Lab. 79. 4° Piso P.II.Ciudad Universitaria, Buenos Aires, C1428EHA, Argentina

Keywords:
orbicules
Ubisch bodies
Morphology
angiosperms.

Presentation Type: Poster:Posters for Sections
Session: 48-21
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:254


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