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Molecular phylogeny of the Neotropical sections of Bulbophyllum (Orchidaceae) using nuclear and plastid spacers

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Abstract:

The systematic utility of sequences from two non-coding regions of plastid DNA, psbA-trnH and trnS-trnG, and one nuclear region, nrITS, was examined in an assessment of phylogenetic relationships among Neotropical sections of Bulbophyllum Thouars (Orchidaceae, Epidendroideae, Dendrobieae). The nrITS region was 6 to 7 times more variable than the two cpDNA regions. No major incongruencies between the nuclear and cpDNA datasets were detected. The combined analysis revealed a well-resolved phylogeny at sectional level based on both maximum parsimony and Bayesian approaches. Six sections of Bulbophyllum are recognized for the Neotropics. Five of these were pre-existent but needed to be recircumscribed and one is proposed as new. We did not find disagreements between maximum parsimony and Bayesian analyses, but the latter showed better resolved relationships between the sections, which are supported by morphological features. Of the two main clades of Neotropical Bulbophyllum species, one has two lineages and occurs predominantly north of the Equator. The second contains four lineages which are highly diverse in southeastern Brazil. Our results suggest a single colonization event in the Neotropics, from Africa to northern South America, followed by dispersion through the Andes to southeastern Brazil.

Keywords: BIOGEOGRAPHY; BULBOPHYLLUM; NEOTROPICS; ORCHIDACEAE; PHYLOGENY; TAXONOMY

Document Type: Research Article

Affiliations: 1: Universidade Estadual de Feira de Santana, Departamento de Ciências Biológicas, Laboratório de Sistemática Molecular de Plantas, Av. Transnordestina s.n., Feira de Santana, Bahia, 44036-900, Brazil 2: Universidade Federal do ABC, Centro de Ciências Naturais e Humanas, Rua Santa Adélia, 166, Bangu, Santo André, São Paulo, 09210-170, Brazil 3: Netherlands Center for Biodiversity Naturalis—National Herbarium of The Netherlands, Leiden University, Einsteinweg 2, P.O. Box 9514, 2300 RA Leiden, The Netherlands 4: Kadoorie Farm and Botanic Garden, Lam Kam Road, Tai Po, New Territories, Hong Kong SAR, People's Republic of China

Publication date: August 1, 2011

iapt/tax/2011/00000060/00000004/art00009
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