SISTEMÁTICA FILOGENÉTICA DOS GÊNEROS NEOTROPICAIS DA TRIBO DORSTENIEAE Dumort. Brosimum Sw, Helianthostylis Baillon e Trymatococcus Poepp. &Endl. (MORACEAE)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The Dorstenieae neotropical clade (Moraceae) is formed by Brosimum Sw (15 spp.), Helianthostylis Baillon (two spp.), and Trymatococcus Poepp. &Endl. (two spp.), and is well represented in the Amazonian biome, with Helianthostylis and Trymatococcus genera endemic to this region. Previous phylogenetic studies of the Moraceae showed that the neotropical Dorstenieae clade is monophyletic, however, the phylogenetic relationships among the species and genera of the neotropical clade have remained unknown. The aim of the present study is to presentan of analysis the phylogenetic relationships among species of the neotropical Dorstenieae clade, by using an improved sampling of taxa from this group Both morphological and molecular characters were obtained for the majority of species from the neotropical Dorstenieae clade. The morphological data set included vegetative and reproductive structures, while the molecular one included the trnL-F region of the chloroplast DNA. The results showed that, as previously observed, the neotropical clade of Dorstenieae tribe is monophyletic. However, the genus Brosimum as proposed by Berg is paraphyletic due to inclusion of species H. sprucei and T. amazonicus between the species of Brosimum. It was observed the formation of two clades for the Brosimum species, which, due to the inverse position of B. lactescens, not corresponding to taxonomic infrageneric groups proposed by Berg for the genus Brosimum. Moreover, the phylogram of maximum likelihood from molecular trnL-F sequences supported the hypothesis proposed by Berg of geographic diversification of the genus Brosimum from Central America. The phylogenetic analyses also incorporated other cladistic methods such as maximum likelihood and bayesian analysis, in order to verify the different approaches. However, due to the low number of informative characters, it was not possible to attain enough resolutions for evaluation of the inter-specific and generic relationships of the neotropical clade of Dorstenieae tribe. The uncertain position of the genera Helianthostylis and Trymatococcus between the clades formed by the Brosimum species and the homoplasic condition of the morphological characters, indicates the necessity of a larger number of data to attain a phylogeny better resolved for the group.

ASSUNTO(S)

sistemática filogenética neotrópicos botanica moraceae taxonomia

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