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Abstract Detail

Molecular Ecology and Evolution

Lu-Irving, Patricia [1], Salimena, Fátima [2], Silva, Tânia [3], Bitencourt, Cássia [3], Viccini, Lyderson [4], Olmstead, Richard [5].

Fruit evolution and diversification rate in Lantana and Lippia (Verbenaceae).

Fleshy fruits may be a key innovation in angiosperms, but the circumstances under which they are correlated with increased diversification rates are unclear. Evidence from detailed empirical studies is needed to elucidate the evolutionary patterns linking fleshy fruits with enhanced diversification. The Lantana-Lippia clade comprises approximately 230 species of woody neotropical shrubs and trees, within which fleshy fruits have been derived from dry fruits four times independently. With a well-resolved phylogeny for this lineage, we can test for a relationship between fleshy fruits and 1) higher diversification rates, and 2) larger geographic ranges. Phylogenetic reconstruction in the Lantana-Lippia clade is challenging; previous studies have found insufficient variability among chloroplast loci and incongruence between nuclear loci sequenced as data sources. We sequenced several low copy nuclear loci (PPR genes) to resolve the phylogeny of a representative sample of 71 species. We found that there was incongruence between phylogenetic reconstructions from different loci, as expected, but that the topologies of the coalescent (“species”) tree and the tree inferred from concatenated data were broadly similar. The concatenated data were used to infer an ultrametric tree, using three internal calibration points, which reconstructed a Miocene origin for the Lantana-Lippia clade, and for core Lantaneae. Speciation rates in fleshy-fruited taxa were found to be significantly higher than in dry-fruited taxa, but there is no clear pattern at a broad scale to indicate that fleshy fruits may be linked with an increased capacity for geographic range expansion.

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1 - University Of Washington, Department Of Biology, Box 355325, Seattle, WA, 98195, USA
2 - Herbário CESJ, Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, 360333900, Brazil
3 - Universidade Estadual de Feira de Santana, Departamento de Ciências Biológicas, Feira de Santana, Bahia, 44031-460, Brazil
4 - Universidade Federal de Juiz de Fora, Departamento de Botânica, Juiz de Fora, Minas Gerais, 360333900, Brazil
5 - University Of Washington, Department Of Biology, Campus Box 355325, Seattle, WA, 98195-5325, USA

seed dispersal.

Presentation Type: Oral Paper:Papers for Topics
Session: 61
Location: Salon 15/16/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 9:00 AM
Number: 61005
Abstract ID:857
Candidate for Awards:None

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