Molecular phylogeny of the Brazilian endemic genus Orthophytum (Bromelioideae, Bromeliaceae) and its implications on morphological character evolution

Louzada, Rafael B., Schulte, Katharina, Wanderley, Maria das Graças L., Silvestro, Daniele, Zizka, Georg, Barfuss, Michael H.J., and Palma-Silva, Clarisse (2014) Molecular phylogeny of the Brazilian endemic genus Orthophytum (Bromelioideae, Bromeliaceae) and its implications on morphological character evolution. Molecular Phylogenetics and Evolution, 77. pp. 54-64.

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Abstract

The saxicolous genus Orthophytum (∼60 species, Bromeliaceae) is endemic to eastern Brazil and diversified in xeric habitats of the Atlantic Rainforest, Caatinga and campos rupestres. Within the genus, two main groups are discerned based on the presence or absence of a pedunculate inflorescence, which are further subdivided into several morphological subgroups. However, these systematic hypotheses have not yet been tested in a molecular phylogenetic framework. Here we present the first phylogenetic analysis of Orthophytum using nuclear and plastid markers (phytochrome C, and trnH-psbA and trnL-trnF spacers). Forty species representing the two main groups and all subgroups of Orthophytum, and the related genera Cryptanthus (8 spp.) and Lapanthus (2 spp.) were analyzed. The phylogenetic reconstruction revealed a well-supported clade termed Eu-Orthophytum, containing species with pedunculate inflorescences only. The Orthophytum species with sessile inflorescence formed two clades: (1) the amoenum group and (2) the vagans group plus O. foliosum, the only pedunculate Orthophytum species found outside Eu-Orthophytum. The vagans clade is in sister group position to Eu-Orthophytum. Within the latter, the subgroup mello-barretoi was sister to the most diversified clade, termed Core Orthophytum. Morphological character state reconstructions of floral characters used in previous taxonomic treatments as key diagnostic characters (penduncle presence, corolla form, and petal appendage form) showed different levels of homoplasy.

Item ID: 35171
Item Type: Article (Research - C1)
ISSN: 1095-9513
Keywords: Bromelioideae, Espinhaço Range, phytochrome C, PHYC, trnH-psbA spacer, trnL-trnF spacer
Funders: São Paulo Research Foundation/FAPESP, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Projects and Grants: São Paulo Research Foundation/FAPESP graduate research fellowship RBL 08/52912-5 , São Paulo Research Foundation/FAPESP graduate research fellowship CP-S 2009/52725-3
Date Deposited: 02 Sep 2014 05:36
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060310 Plant Systematics and Taxonomy @ 40%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060309 Phylogeny and Comparative Analysis @ 40%
06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060302 Biogeography and Phylogeography @ 20%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 40%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960811 Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity @ 30%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 30%
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