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Abstract Detail

Systematics Section / ASPT

Fougère-Danezan, Marie [1], Maumont, Stéphan [2], Herendeen, Patrick S. [3], Bruneau, Anne [1].

Floral evolution and biogeography in the resin-producing Detarieae (Leguminosae).

WITHIN the morphologically diverse monophyletic legume tribe Detarieae s.l., two clades of resin-producing genera are among the first to diverge (the Prioria and Detarieae s.s. clades). This group represents 25 genera of large tropical trees with species in Asia, Africa and America. A large number of these species are of economic importance for their timber, resins, gums and oils (e.g., Hymenaea, Copaifera, Prioria). Although previously placed in different taxonomic groups, recent phylogenetic analyses suggest that the resin-producing Detarieae together may be monophyletic. Phylogenetic relationships among these resin-producing genera were examined using chloroplast and nuclear DNA sequences (trnL-F, matK, ITS) and morphological data. The phylogenetic analyses reveal an important discrepancy with previous classifications, which may in part be explained by a complex pattern of floral evolution. Flowers tend to be zygomophic because of the reduction of the abaxial and lateral petals, but reversals to an actinomorphic corolla and evolution to apetalous flowers are commonly observed. Phylogenetic relationships and molecular dating suggest that Africa is the area of origin for the resin-producing Detarieae. After a first diversification that gave rise to most of the extant genera, the New World was probably reached by long distance dispersal across the Atlantic Ocean via marine currents during the Oligocene and lower Miocene. Geodispersion via the Arabian Peninsula is the most probable mechanism responsible for the colonisation of India and Asia.

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1 - Université de Montréal, Institut de recherche en biologie végétale, 4101 rue Sherbrooke est, Montréal, Québec, H1X 2B2, Canada
2 - Université Paul Sabatier, Laboratoire d’Évolution et Diversité Biologique, Bât. 4R3, 118 route de Narbonne, Toulouse, 31 062, France
3 - George Washington University, Biological Sciences, 2023 G St.NW, Washington, DC, 20052, USA

floral evolution

Presentation Type: Oral Paper:Papers for Sections
Session: 19-10
Location: 106/Ayres
Date: Monday, July 31st, 2006
Time: 3:45 PM
Abstract ID:309

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