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The phylogenetic position of Oxychloë (Juncaceae): evidence from morphology, nuclear and plastid DNA regions

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Abstract:

Use of molecular data for phylogenetic studies in Juncaceae/Cyperaceae beginning in 1993 has resulted in an uncertain taxonomic position of the Andean Oxychloë Phil. RbcL data used in earlier analyses resolved Oxychloë inside Cyperaceae or as their sister group. However, many typically juncaceous morphological features (e.g., spiro- or ortostichous leaves, many ovules, prominent tepals) differentiate Oxychloë from Cyperaceae. The present paper reveals relationships among the genera Oxychloë, Patosia, Distichia, Marsippospermum and Rostkovia based on both morphological and molecular data (cpDNA: rbcL, trnL intron and trnL-trnF intergenic spacer, matK and nrDNA: ITS1 & 2). Oxychloë is undoubtedly a member of Juncaceae based on both sources of data. It does not form a monophyletic lineage but is clustered with the Andean genera Patosia and Distichia. Oxychloë andina and O. bisexualis are closely related and form a sister group to O. haumaniana and O. castellanosii based on strict consensus tree of molecular data. Their position remains unresolved based on morphological data, however.

Keywords: ITS1; ITS2; MATK; MORPHOLOGY; OXYCHLOE; PHYLOGENY; RBCL; SEQUENCE DATABASES; TOTAL EVIDENCE; TRNL-TRNF

Document Type: Research Article

Affiliations: 1: Institute of Botany, Dept. of Taxonomy, Academy of Sciences, Zámek 1, 252 43 Průhonice, Czech Republic 2: Centre for Integrated Genomics and Institute of Molecular Genetics, Academy of Sciences, Flemingovo nám. 2, 166 37 Prague 6, Czech Republic

Publication date: 2007-02-01

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