Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59724
Type: Artigo de periódico
Title: Phylogeny and circumscription of the near-endemic Brazilian tribe Microlicieae (Melastomataceae)
Author: Fritsch, PW
Almeda, F
Renner, SS
Martins, AB
Cruz, BC
Abstract: The members of tribe Microlicieae in the flowering plant family Melastomataceae are nearly all endemic to the cerrado biome of Brazil. Traditional classifications of the Melastomataceae have attributed between 15 and 17 genera to the Microlicieae, but subsequent revisions have circumscribed the tribe more narrowly. The monophyly and intergeneric relationships of the Microlicieae were evaluated through phylogenetic analyses with molecular and morphological data sets. Incorporation of DNA sequences from the intron of the chloroplast gene rpl16 into a previously generated family-wide data set yielded a clade comprising Chaetostoma, Lavoisiera, Microlicia, Rhynchanthera, Stenodon, and Trembleya ("core Microlicieae"), with Rhynchanthera as the first-diverging lineage. The other four genera of Microlicieae sampled are placed in other clades: Eriocnema with Miconieae; Siphanthera with Aciotis, Nepsera, and Acisanthera of Melastomeae; Castratella as sister to Monochaetum of Melastomeae; and Cambessedesia as part of an unresolved polytomy in a large clade that includes most Melastomataceae. Analyses of the chloroplast genes rbcL and ndhF that included three core genera produced similar results, as did the combined analysis of all three data sets. Combined parsimony analyses of DNA sequences from rpl16 and the nuclear ribosomal intercistronic transcribed spacer (ITS) region of 22 species of core Microlicieae yielded generally low internal support values. Lavoisiera, recently redefined on the basis of several morphological characters, was strongly supported as monophyletic. A morphological phylogenetic analysis of the Microlicieae based on 10 parsimony-informative characters recovered a monophyletic core Microlicieae but provided no further resolution among genera. Penalized likelihood analysis with two calibration time windows produced an age estimate of 3.7 million years for the time of initial divergence of strictly Brazilian core Microlicieae. This date is in general agreement with the estimated age of the most active stage of development of cerrado vegetation and implies an adaptive shift from hydric to seasonally dry habitats during the early evolution of this group.
Subject: cerrado
ITS
Melastomataceae
Microlicieae
ndhF
phylogeny
rbcL
rp116
Country: EUA
Editor: Botanical Soc Amer Inc
Rights: fechado
Identifier DOI: 10.3732/ajb.91.7.1105
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File Description SizeFormat 
WOS000222964400010.pdf156.85 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.