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(Bromeliaceae) in the Brazilian Atlantic Rainforest: a Case Study in Aechmea Subgenus Ortgiesia Q

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(Bromeliaceae) in the Brazilian Atlantic Rainforest: a Case Study in Aechmea Subgenus Ortgiesia Q Molecular Phylogenetics and Evolution 98 (2016) 346–357 Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev Diversification of Bromelioideae (Bromeliaceae) in the Brazilian Atlantic rainforest: A case study in Aechmea subgenus Ortgiesia q Márcia Goetze a, Katharina Schulte b,c, Clarisse Palma-Silva d, Camila M. Zanella a, Miriam V. Büttow a, ⇑ Fernanda Capra a, Fernanda Bered a, a Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Departamento de Genética, Avenida Bento Gonçalves 9500, PO Box 15053, 91501-970 Porto Alegre, RS, Brazil b Australian Tropical Herbarium, James Cook University, PO Box 6811, Cairns, QLD 4878, Australia c Centre for Tropical Biodiversity and Climate Change, James Cook University, Discovery Drive, Townsville, QLD 4814, Australia d Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Biociências, Departamento de Ecologia, Avenida 24A 1515, 13506-900 Rio Claro, SP, Brazil article info abstract Article history: Aechmea subgenus Ortgiesia comprises ca. 20 species distributed in Brazil, Argentina, Paraguay, and Received 29 December 2014 Uruguay, with a center of diversity in the Brazilian Atlantic rainforest. We examined interspecific rela- Revised 26 December 2015 tionships of Ortgiesia based on Amplified Fragment Length Polymorphisms (AFLP). Ninety-six accessions Accepted 1 March 2016 belonging to 14 species of Ortgiesia were sampled, and genotyped with 11 AFLP primer combinations. The Available online 5 March 2016 neighbor joining (NJ) tree depicted two main genetic groups within Aechmea subgenus Ortgiesia, and four subgroups. The NJ tree showed short internal branches, indicating an overall shallow genetic divergence Keywords: among Ortgiesia species as expected for the recently radiated subfamily Bromelioideae. Our results sug- Aechmea gest that hybridization and/or incomplete lineage sorting may have hampered the reconstruction of AFLP Biogeography interspecific relationships in Aechmea subgenus Ortgiesia. The mapping of petal color (yellow, blue, pink, Core bromelioids or white), inflorescence type (simple or compound), and inflorescence shape (ellipsoid, subcylindric, Interspecific relationships cylindric, or pyramidal) against the NJ tree indicated that these characters are of limited taxonomic Speciation use in Aechmea subgenus Ortgiesia due to homoplasy. An analysis of the current distribution of Ortgiesia identified the southern region of the Brazilian Atlantic rainforest, between latitudes of 26° and 27°S, as the center of diversity for the subgenus. Ó 2016 Elsevier Inc. All rights reserved. 1. Introduction and water, as well as for providing microhabitats for many invertebrates and even vertebrates (Benzing, 2000). For subfamily The Brazilian Atlantic rainforest represents one of the top five Bromelioideae (33 genera and 936 species; Luther, 2012) the biodiversity hotspots on Earth, with high levels of endemism Atlantic rainforest is the center of diversity with ca. 505 species (Myers et al., 2000). Despite its reduction to only 11–16% of its (Martinelli et al., 2008) including ten genera endemic to this biome original area (Ribeiro et al., 2009), it is home to more than (Smith and Downs, 1979; Stehmann et al., 2009). 15,000 plant species of which 45% are endemic to this biome Subfamily Bromelioideae is morphologically and ecologically (Stehmann et al., 2009). Bromeliaceae, the second largest family highly diverse, comprising terrestrial, lithophytic and epiphytic among vascular epiphytes in the Neotropics, are an important life-forms. Molecular phylogenetic studies have revealed that and characteristic element of the Atlantic rainforest, being Bromelioideae comprise several small lineages, which diverged represented by 816 species of which 651 are endemic (Stehmann early in the evolution of the group, and the core bromelioid clade, et al., 2009). Bromeliads play an important ecological role due to which harbors the majority of species (Schulte and Zizka, 2008; their interaction with fauna, as sources for pollen, nectar, fruit, Schulte et al., 2005, 2009; Silvestro et al., 2014). Recent molecular phylogenetic studies inferred an Andean origin of the subfamily in the late Miocene, at around 13 Ma, and an early migration to East- q This paper was edited by the Associate Editor Timothy Evans. ern Brazil via a central South American corridor, at around 10 Ma ⇑ Corresponding author. (Schulte et al., 2005; Silvestro et al., 2014). Whereas the early E-mail addresses: [email protected] (M. Goetze), katharina.schulte@ diverging Bromelioideae lineages were terrestrials and lithophytes, jcu.edu.au (K. Schulte), [email protected] (C. Palma-Silva), the acquisition of a central water impounding structure, the tank, [email protected] (C.M. Zanella), [email protected] (M.V. Büttow), [email protected] (F. Capra), [email protected] (F. Bered). facilitated the core bromelioid’s invasion of the epiphytic niche, http://dx.doi.org/10.1016/j.ympev.2016.03.001 1055-7903/Ó 2016 Elsevier Inc. All rights reserved. M. Goetze et al. / Molecular Phylogenetics and Evolution 98 (2016) 346–357 347 especially within the Atlantic rainforest, where they diversified This study aims to gain insights into the diversification of Aech- extensively (Givnish et al., 2011; Schulte et al., 2009; Silvestro mea subgenus Ortgiesia in the Atlantic rainforest. To this aim, we et al., 2014). (1) reconstructed interspecific relationships in Ortgiesia based on Aechmea subgenus Ortgiesia belongs to the tank-forming core AFLP data, (2) assessed the taxonomic value of key morphological bromelioid clade (Sass and Specht, 2010; Schulte et al., 2009; characters, and (3) examined biogeographic patterns in Ortgiesia. Silvestro et al., 2014), and comprises ca. 20 species (Luther, 2010), most of which are endemic to the Atlantic rainforest (Smith and Downs, 1979). The subgenus occurs in south and south- 2. Materials and methods eastern Brazil (Espírito Santo to Rio Grande do Sul states), mainly in the subtropical area, with several narrow endemic species, some 2.1. Plant material only known from the type collection. Two more widespread spe- cies, Aechmea calyculata and A. recurvata, also expand to the west A total of 96 individuals belonging to 13 Aechmea species of and reach into Argentina, Paraguay, and Uruguay (Smith and subgenus Ortgiesia, one undescribed and potentially new taxon Downs, 1979). Ortgiesia species are encountered from sea level to (here referred to as Aechmea sp.), plus A. kleinii, originally described 1200 m elevation as epiphytes, lithophytes, or terrestrials (Reitz, as belonging to Ortgiesia but included in subgenus Pothuava by 1983; Smith and Downs, 1979; Wanderley and Martins, 2007). Smith and Downs (1979) and Luther (2010), were sampled along Previous molecular phylogenetic studies included only a limited the geographical distribution of the group in the Brazilian Atlantic number of representatives of subgenus Ortgiesia. These studies rainforest (Table 1; Fig. 1). As outgroup five species from the Nidu- demonstrated a close phylogenetic relationship between most of larioid clade were included. Fresh leaves of 1–9 individuals per the investigated species, albeit the monophyly of the subgenus species were sampled and dried using silica gel. Voucher informa- was not confirmed (Horres et al., 2007; Schulte and Zizka, 2008; tion is provided in Table 1. Schulte et al., 2009; Silvestro et al., 2014). In several studies, Aech- mea racinae L.B.Sm. (subgenus Lamprococcus) was nested within Ortgiesia (Horres et al., 2007; Schulte and Zizka, 2008; Schulte 2.2. AFLP procedures et al., 2005; Silvestro et al., 2014) or found in sister group position to an Ortgiesia clade (Schulte et al., 2009). In the molecular phylo- Total genomic DNA was extracted with the CTAB method fol- genetic study of Sass and Specht (2010), the eight Ortgiesia species lowing Doyle and Doyle (1990). Amplified fragment length poly- included formed a clade together, however Billbergia zebrina Lindl. morphism protocols followed Vos et al. (1995) with was nested within this clade. So far, interspecific relationships modifications as outlined by Schulte et al. (2010). Briefly, 30 ng within Ortgiesia remained unclear due to limited resolution of phy- of genomic DNA were digested with the restriction enzymes Hin- logenetic reconstructions, which may be due to the relative young dIII and MseI (10 U/ll; Fermentas) for 12 h at 37 °C in a final vol- age of the extant species of the subgenus. In a recent age estimate ume of 30 ll, and ligated to HindIII and MseI adapters in the based on molecular dating analysis of a multi-locus phylogeny of same reaction using T4 DNA ligase (5 U/ll; Fermentas). Pre- the subfamily Bromelioideae, the crown diversification of Ortgiesia selective amplifications were carried out with primers with one was estimated to have started during the late Pliocene, at around selective base each (HindIII-A and MseI-C, respectively) in a total 2.5 Ma (Silvestro et al., 2014). volume of 10 ll containing 2 ll of the 1:10 diluted restriction- Floral features, in particular the petal color and the inflores- ligation product, 1 Â Taq buffer (Kapa Biosystems, Boston, USA), cence branching pattern, have been given much emphasis in the 0.5 lM of each primer, 2 mM of dNTP mix, and 0.25 U of Taq taxonomy and systematics of Aechmea subgenus Ortgiesia (Smith DNA polymerase (Kapa Biosystems). Assays were subjected to and Downs, 1979). Petal color in Ortgiesia
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