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Abstract Detail


Developmental and Structural Section

Rosenfeldt, Sonia [1], Galati, Beatriz Gloria [1].

Systematic importance of orbicule diversity in Oxalis sps.

ORBICULES of eleven Oxalis species of Buenos Aires province (Argentina) were investigated with scanning and transmission electron microscopes. The orbicules are randomly dispersed on the inner surface of the anther locule. They are plate-like and more or less rounded in most of the investigated species. The orbicules surface is generally smooth. In few cases the orbicules surface has minute verrucoid processes. Perforations are found in some species. There is also a considerable variation in the size of the orbicules, even within a single species. In some cases, the corpus of the orbicules fuse resulting in aggregates of two or more orbicules that are observed as rod-like to elongated units with a lightly wavy margin. Four different types and two subtypes of orbicules have been recognized in this work. We conclude that the close morphological similarity between species is also reflected in their orbicules and suggest that the orbicules morphology may be systematically useful.


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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:
Oxalis
orbicules
Ubisch bodies
Taxonomy.

Presentation Type: Array
Session: 48-20
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM
Abstract ID:249


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