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Dissertação
Sistemática filogenética dos gêneros neotropicais da tribo Dorstenieae: Brosimum Sw, Helianthostylis Baillon e Trymatococcus Poepp. & Endl. (MORACEAE)
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 phylogen...
Autor principal: | Silva, Welma Sousa |
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Grau: | Dissertação |
Idioma: | por |
Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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Assuntos: | |
Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12753 http://lattes.cnpq.br/9356313441181696 |
Resumo: |
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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. |