An expanded molecular phylogeny of Plumbaginaceae, with emphasis on <i>Limonium</i> (sea lavenders): Taxonomic implications and biogeographic considerations

  • Konstantina Koutroumpa
    Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland
  • Spyros Theodoridis
    Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland
  • Ben H. Warren
    Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland
  • Ares Jiménez
    Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland
  • Ferhat Celep
    Department of Biology, Faculty of Arts and Sciences Kırıkkale University Kırıkkale Turkey
  • Musa Doğan
    Department of Biological Sciences Middle East Technical University Cankaya, Ankara Turkey
  • Maria M. Romeiras
    Linking Landscape, Environment, Agriculture and Food (LEAF) Instituto Superior de Agronomia (ISA), Universidade de Lisboa Lisboa Portugal
  • Arnoldo Santos‐Guerra
    Calle Guaidil 16 Tegueste, Tenerife Spain
  • Jóse María Fernández‐Palacios
    Island Ecology and Biogeography Research Group, Universitario de Enfermedades Tropicales y Salud Publica de Canarias (IUETSPC) Universidad de La Laguna Tenerife Spain
  • Juli Caujapé‐Castells
    Jardín Botánico Canario “Viera y Clavijo” – Unidad Asociada CSIC Cabildo de Gran Canaria Las Palmas de Gran Canaria Spain
  • Mónica Moura
    CIBIO, Research Centre in Biodiversity and Genetic Resources, InBIO Associate Laboratory, Azores Group Universidade dos Açores Ponta Delgada, Azores Portugal
  • Miguel Menezes de Sequeira
    InBio, Research Network in Biodiversity and Evolutionary Biology, CIBIO‐Azores, Madeira Botanical Group (GBM) Universidade da Madeira Funchal Portugal
  • Elena Conti
    Department of Systematic and Evolutionary Botany University of Zurich Zurich Switzerland

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<jats:title>Abstract</jats:title><jats:p>Plumbaginaceae is characterized by a history of multiple taxonomic rearrangements and lacks a broad molecular phylogenetic framework. <jats:italic>Limonium</jats:italic> is the most species‐rich genus of the family with <jats:italic>ca</jats:italic>. 600 species and cosmopolitan distribution. Its center of diversity is the Mediterranean region, where <jats:italic>ca</jats:italic>. 70% of all <jats:italic>Limonium</jats:italic> species are endemic. In this study, we sample 201 <jats:italic>Limonium</jats:italic> species covering all described infrageneric entities and spanning its wide geographic range, along with 64 species of other Plumbaginaceae genera, representing 23 out of 29 genera of the family. Additionally, 20 species of the sister family Polygonaceae were used as outgroup. Sequences of three chloroplast (<jats:italic>trnL‐F</jats:italic>, <jats:italic>matK,</jats:italic> and <jats:italic>rbcL</jats:italic>) and one nuclear (ITS) loci were used to infer the molecular phylogeny employing maximum likelihood and Bayesian analyses. According to our results, within Plumbaginoideae, <jats:italic>Plumbago</jats:italic> forms a non‐monophyletic assemblage, with <jats:italic>Plumbago europaea</jats:italic> sister to <jats:italic>Plumbagella</jats:italic>, while the other <jats:italic>Plumbago</jats:italic> species form a clade sister to <jats:italic>Dyerophytum</jats:italic>. Within Limonioideae, <jats:italic>Ikonnikovia</jats:italic> is nested in <jats:italic>Goniolimon</jats:italic>, rejecting its former segregation as genus distinct from <jats:italic>Goniolimon</jats:italic>. <jats:italic>Limonium</jats:italic> is divided into two major clades: <jats:italic>Limonium </jats:italic>subg. <jats:italic>Pteroclados s.l</jats:italic>., including <jats:italic>L. </jats:italic>sect. <jats:italic>Pteroclados</jats:italic> and <jats:italic>L. anthericoides</jats:italic>, and <jats:italic>L. </jats:italic>subg. <jats:italic>Limonium</jats:italic>. The latter is divided into three well‐supported subclades: the monospecific <jats:italic>L. </jats:italic>sect. <jats:italic>Limoniodendron</jats:italic> sister to a clade comprising a mostly non‐Mediterranean subclade and a Mediterranean subclade. Our results set the foundation for taxonomic proposals on sections and subsections of <jats:italic>Limonium</jats:italic>, namely: (a) the newly described <jats:italic>L. </jats:italic>sect. <jats:italic>Tenuiramosum</jats:italic>, created to assign <jats:italic>L. anthericoides </jats:italic>at the sectional rank; (b) the more restricted circumscriptions of <jats:italic>L. </jats:italic>sect. <jats:italic>Limonium</jats:italic> (= <jats:italic>L. </jats:italic>sect. <jats:italic>Limonium</jats:italic> subsect. <jats:italic>Genuinae</jats:italic>) and <jats:italic>L. </jats:italic>sect. <jats:italic>Sarcophyllum</jats:italic> (for the Sudano‐Zambezian/Saharo‐Arabian clade); (c) the more expanded circumscription of <jats:italic>L. </jats:italic>sect. <jats:italic>Nephrophyllum</jats:italic> (including species of the <jats:italic>L. bellidifolium</jats:italic> complex); and (d) the new combinations for <jats:italic>L. </jats:italic>sect. <jats:italic>Pruinosum</jats:italic> and <jats:italic>L. </jats:italic>sect. <jats:italic>Pteroclados</jats:italic> subsect. <jats:italic>Odontolepideae </jats:italic>and subsect. <jats:italic>Nobiles</jats:italic>.</jats:p>

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