Sistemática e filogenética molecular do gênero Hexachlamys (Myrtaceae) através do uso de marcadores plastidiais e nucleares

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2012

RESUMO

Myrtaceae family includes more than 5500 species of trees and shrubs, mainly distributed in tropical and subtropical areas of the world. Species of this family have great ecological significance in forest ecosystems, and they are also economically important to the pharmaceutical, food, cosmetic and perfumery industries. The systematic of this family is very complex, in part by the species-richness of the family. The Hexachlamys O.Berg genus currently encompasses 10 to 15 species, distributed from southern and southeastern Brazil to Argentina, Bolivia, Paraguay and Uruguay. It was considered an independent genus in 1968. In a recent review about Brazilian Myrtaceae genera, Hexachlamys was distincted from Eugenia genus based on a single morphological character: calyx pentamerous or hexamerous (Hexachlamys) versus Calyx tetramerous (Eugenia). However, this classification has been considered weak, since only one character is not enough to asure generic delimitations. Thus, the synonymization of the Hexachlamys in Eugenia has been suggested by some authors. Therefore, systematic and molecular phylogeny may be important to help the taxonomy of these groups. The aim of this study was to perform a molecular phylogenetic analysis for Hexachlamys genus. A set of four chloroplast (accD, rpoB, rpoC1e trnH-psbA) and one nuclear (ITS2) regions were selected. Phylogenetic analysis based on maximum parsimony and Bayesian methods were performed using these markers alone or in combination. The major variation found in these DNA regions was related to species differentiation and no one was related to differences between Eugenia and Hexachlamys. In general, both Parsimony and Bayesian analyses performed with all markers have showed that Hexachlamys species did not form a monophyletic group. This results corroborates with the morphological data that has included Hexachlamys in Eugenia. Thus, the molecular data of this study contributed with additional data to the systematic and taxonomy of this genus, and also with genetic information to help in the conservation of these species.

ASSUNTO(S)

hexachlamys myrtaceae

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