Evolution and Diversification in the Sapindales
Martinez-Habibe, Maria Cristina .
Preliminary study of the fruit anatomy of Canarieae (Burseraceae).
Fruits historically have been the most important character to set the tribal limits in Burseraceae. However, endocarp structure is incompletely known within the family, and thus the importance of this character is unclear. This preliminary study of fruit cross-sections in Canarieae documents the general distribution of the tissues that correspond to the exo-, meso- and endocarp. The detailed arrangement and measurement of the tissues are reported here for the first time in all eight genera in the tribe. The evidence suggests that in all cases (except Pseudodacryodes), the endocarp has at least one layer of parenchyma cells within which a sclereid layer and in some cases an inner epidermis is present. All Canarieae exhibit fruits with secretory canals and some taxa have epidermal glands with resin-like contents. Evidence of carpellar sutures was found for all Canarieae, and in Dacryodes, Haplolobus, Rosselia and Santiria an articulated plate is present. Seven fruit characters were delimited and included in a structural (including other morphological characters) phylogenetic analysis that yielded one tree similar in topology to trees from molecular studies. The characters resulting from this study need to be assessed through more sampling within each genus. The characters appear to be useful in delimiting genera and need to be mapped onto molecular phylogenies to fully understand their evolution.
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1 - Rancho Santa Ana Botanic Garden, 1500 N College Avenue, Claremont, CA, 91711, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Boulevard B/Hilton
Date: Tuesday, July 10th, 2007
Time: 10:00 AM