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Abstract Detail

Systematics Section/ASPT

Ocampo, Gilberto [1], Ribeiro, Rafaella C. [2], Trombert De Oliveira, Denise [2], Goldenberg, Renato [3], Michelangeli, Fabian [4], Almeda, Frank [5].

Using seed morphology to evaluate taxonomic and phylogenetic hypotheses in the Miconieae (Melastomataceae).

Seed morphology in the Melastomataceae is diverse and has long been used for systematic purposes. Recent studies of the neotropical tribe Miconieae have shown that seed morphology does not support generic circumscriptions, but in some cases it may be correlated with specific clades. In this study, the seed diversity of ca. 400 species of the tribe was documented with scanning electron microscopy (SEM) and 23 morphological characters were coded into a data matrix. The morphological data set was used to test different tree topological hypotheses using Bayes factor comparisons and Templeton tests; in particular, support for monophyly of the genera recognized in traditional classifications and clades identified in DNA phylogenetic reconstructions were assessed. Furthermore, Bayesian and maximum parsimony phylogenetic trees were estimated using chloroplast and nuclear DNA sequence data. The diversification history of seed morphological characters was traced, and randomization procedures were employed to test whether the morphological data showed phylogenetic signal. In addition, new preliminary data for nine anatomical characters was obtained from a subset of samples to gain insights into the homology of morphological features. The characteristics of the embryo (shape and curvature) and seed appendage were, among others, some of the features that showed more variation. These anatomical characters provide further evidence to understand seed diversification in the Miconieae.

Broader Impacts:

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Related Links:
California Academy of Sciences, Department of Botany
Miconieae: Planetary Biodiversity Inventory website

1 - California Academy of Sciences, 55 Music Concourse Dr., Golden Gate Park, San Francisco, CA, 94118, USA
2 - Universidade Federal de Minas Gerais, Departamento de Botânica, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 30123-970, Brazil
3 - Universidade Federal do Paraná, Departamento de Botânica, R. Francisco H. dos Santos s.n., Campus do Centro Politécnico, Curitiba, Paraná, 81531-970, Brazil
4 - The New York Botanical Garden, Institute of Systematic Botany, 2900 Southern Blvd., Bronx, NY, 10458, USA
5 - California Academy of Sciences, Department of Botany, 55 Music Concourse Drive, Golden Gate Park, San Francisco, CA, 94118, USA

Hypothesis testing
Phylogenetic signal
seed anatomy
seed morphology.

Presentation Type: Oral Paper:Papers for Sections
Session: 39
Location: Elmwood/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 10:15 AM
Number: 39007
Abstract ID:254
Candidate for Awards:None

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