Phylogenetics and historical biogeography of Solanum section Brevantherum (Solanaceae).

Molecular Phylogenetics and Evolution
Juan D TovarLeandro L Giacomin

Abstract

Patterns of diversification in Neotropical plants have been studied intensively over the past decades. Most studies have focused on groups that migrated to and radiated into the Neotropics, however, with little focus on understanding diversification patterns in indigenous Neotropical groups. This study focuses on Solanum section Brevantherum Seithe (Solanaceae), a group of Neotropical nightshade shrubs or treelets defined mostly by terminal inflorescences with long peduncles, plurifoliate sympodial units and porrect-stellate, dendritic-echinoid, or lepidote trichomes. We generated sequences from two nuclear (ITS, waxy) and one plastid marker (trnT-F) to infer phylogenetic relationships under Bayesian and Maximum likelihood approaches. We reconstructed a time-calibrated tree to estimate both the ages of main splits and the ancestral ranges of the lineages. Finally, we carried out a biogeographic stochastic mapping (BSM) analysis to determine the main processes driving current distributions of the group. Results show the non-monophyly of the section as previously recognized and the homoplasy of morphological characters traditionally used to circumscribe it. Two main clades that encompass most species formerly recognized in sectio...Continue Reading

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