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Abstract Detail


Evolution and Diversification in the Sapindales

Bachelier, Julien B. [1], Endress, Peter K. [1].

Comparative floral morphology in the clade of Anacardiaceae and Burseraceae and gynoecium structural diversity in Spondioideae (Anacardiaceae).

Anacardiaceae and Burseraceae are two pantropical families which form a robust clade nested within Sapindales. However, whether they are sisters to each other or whether Burseraceae are nested in Anacardiaceae is still uncertain, because previous phylogenetic analyses did not include all the critical genera that could help to resolve this question. We undertook a comparative study of the reproductive structures of both families. Our results support the close relationship between both families. We observed striking structural similarities in the plurilocular, polysymmetric gynoecia of some Spondioideae (Anacardiaceae) and Beiselia (sister to the remainder of Burseraceae). We also noted a similar trend of reduction in carpel number and symmetry plane number in both families. However, unilocular, monosymmetric gynoecia only occur in Anacardiaceae. They are characteristic for Anacardioideae and were previously known from two genera in Spondioideae. Three genera formerly placed in Anacardioideae have recently been transferred to Spondioideae, which thus exhibit now the largest structural diversity of gynoecia in the clade Anacardiaceae-Burseraceae. However, unilocular, monosymmetric gynoecia are either monomerous or pseudomonomerous, and their systematic distribution suggests that they have arisen independently in Anacardioideae and Spondioideae and may even have evolved more than once in Spondioideae.


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1 - University of Zurich, Institute of Systematic Botany, Zollikerstrasse 107, Zurich, 8008, Switzerland

Keywords:
Sapindales
Anacardiaceae
Spondioideae
Burseraceae
reproductive structures
gynoecium symmetry.

Presentation Type: Symposium or Colloquium Presentation
Session: C01
Location: Boulevard B/Hilton
Date: Tuesday, July 10th, 2007
Time: 9:15 AM
Number: C01006
Abstract ID:1182


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