Journal Article

Delimitation of <i>Sauropus</i> (Phyllanthaceae) Based on Plastid <i>matK</i> and Nuclear Ribosomal ITS DNA Sequence Data

Kanchana Pruesapan, Ian R. H. Telford, Jeremy J. Bruhl, Stefano G. A. Draisma and Peter C. Van Welzen

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 102, issue 6, pages 1007-1018
Published in print December 2008 | ISSN: 0305-7364
Published online October 2008 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcn193
Delimitation of Sauropus (Phyllanthaceae) Based on Plastid matK and Nuclear Ribosomal ITS DNA Sequence Data

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

A recent molecular phylogenetic study showed that Sauropus is deeply embedded within Phyllanthus together with its allies, Breynia and Glochidion. As relationships within Sauropus are still problematic and the relationship with Breynia has long been doubted, more molecular data are needed to test/corroborate such a broad definition of Phyllanthus. This study aims to clarify the status and delimitation of Sauropus and establish its position within Phyllanthaceae.

Methods

Plastid matK and nuclear ribosomal ITS DNA sequence data for Sauropus and its allies were used to construct phylogenetic trees using maximum parsimony and Bayesian methods.

Key Results

Within Phyllanthus, Sauropus can be split into the mainly south-east Asian Sauropus sensu stricto (s.s.) plus Breynia and the mainly Australian Sauropus (formerly Synostemon). Sauropus s.s. plus Breynia comprise two distinct clades; one is the combination of Sauropus sections Glochidioidei, Sauropus and Schizanthi and the other is the combination of Sauropus sections Cryptogynium and Hemisauropus and the monophyletic genus Breynia.

Conclusions

Molecular data indicate that Synostemon should be reinstated at the same level as Sauropus s.s. and that Sauropus s.s. should be united with Breynia under the latter, older name. The molecular data corroborate only two of the five infrageneric groups of Sauropus recognized on the basis of morphological data.

Keywords: Breynia; DNA sequence data; Euphorbiaceae; ITS; matK; molecular phylogenetics; Phyllanthaceae; Sauropus; Synostemon

Journal Article.  6259 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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