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Abstract Detail



Systematics Section/ASPT

Cavalcanti, Taciana B. [1], Inglis, Peter W. [2].

A molecular phylogeny of the genus Diplusodon Pohl (Lythraceae), from the Brazilian Cerrado, using ITS and ETS sequences.

Diplusodon is the second largest genus of the Lythraceae and is endemic to the South American Cerrado biome. The species are shrubs or subshrubs with showy, 6-merous, actinomorphic flowers and present a high degree of narrow endemism among species, where many are restricted to specialized micro-habitats occurring in mountains of high altitudes with quartzite rocks. A Bayesian and maximum parsimony cladistic analysis, based of nuclear ITS and ETS sequences and coded ETS indel characters, was performed to examine the phylogenetic relationships within the genus. Congruence between individual data matrices was evaluated at each tree node by calculation of partitioned Bremer support values.
The total evidence phylogeny of the genus confirmed the monophyly of Diplusodon, and revealed three geographical foci of rapid diversification. Two distinct lineages evolved in the mountains east of the São Francisco River where species have the most plesiomorphic features, and a third explosive speciation occurred to the west of the São Francisco River in the mountains of the Brazilian Central Plateau. The current infrageneric classification of Diplusodon based on leaf venation patterns was not supported in the phylogenetic analysis.


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1 - Embrapa Genetic Resources and Biotechnology, Laboratório de Sistemática Vegetal, Parque Estação Biológica - PqEB, Av. W5 Norte (final), Caixa Postal 02372, Brasília, DF, 70770-917, Brazil
2 - Embrapa Genetic Resources and Biotechnology, Laboratório de Genética Vegetal, Parque Estação Biológica - PqEB, Av. W5 Norte (final), Caixa Postal 02372, Brasília, DF, 70770-917, Brazil

Keywords:
Diplusodon
Lythraceae
Brazil
Cerrado biome
South America.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PSY019
Abstract ID:347
Candidate for Awards:None


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