Filogenia e filogeografia molecular de Anadenanthera Speg. Leguminosae (Mimosoideae)

• Autor(a) principal: Silva, Roberta dos Santos
• Data de Publicação: 2010
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/369
• topic: Anadenanthera; Filogenia; Filogeografia; Florestas estacionais; Anadenanthera; Phylogeny; Phylogeography; Seasonal forests; CNPQ::CIENCIAS BIOLOGICAS::BOTANICA

Seasonal Forests are characterized by two seasons and are distributed in a disjointed manner across South America. The study of floristic elements that are characteristic of these areas is of great importance to our understanding of the historical connections between these fragments. Anadenanthera Speg. occurs within regions that contain Seasonal Forests, and A. colubrina var. cebil (Griseb.) Altschul has been indicated by some authors as a model species for studying the evolutionary history of these forests. Anadenanthera is a small genus of trees belonging to the tribe Mimoseae (Leguminosae-Mimosoideae). This genus is now circumscribed as two species with two varieties each: A. colubrina (Vell.) Brenan var. colubrina, A. colubrina var. cebil (Griseb.) Altschul, A. peregrina (L.) Speg. var. peregrina and A. peregrina var. falcata (Bentham) Altschul, though they are regarded as four distinct species. In this study, we used sequences from the ITS region (Internal Transcribed Spacer) rDNA to study the phylogeny and phylogeography of the Anadenanthera genus. The results revealed the monophyly of Anadenanthera colubrina var. colubrina, but did not confirm the monophyly of the other varieties. The genetic diversity of Anadenanthera was unevenly distributed, being higher for the populations of the Atlantic region, which was considered the center of diversity of the genus. The results suggest a link between the forests of the Chiquitano region and the Northeast Atlantic region. The phylogeographic structure also suggests colonization of different refuges and of rapid and recent expansion events for Anadenanthera.