DNA Sequence Variation among Conspecific Accessions of the Legume Coursetia caribaea Reveals Geographically Localized Clades Here Ranked as Species

Matt Lavin, R. Toby Pennington, Colin E. Hughes, Gwilym P. Lewis, Alfonso Delgado-Salinas, Rodrigo Duno De Stefano, Luciano P.De Queiroz, Domingos Cardoso, Martin Wojciechowski

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Coursetia caribaea is geographically and morphologically the most variable species in the genus Coursetia and in the tribe Robinieae (Leguminosae, Papilionoideae). Because of potentially undetected species, we assessed the phylogenetic relationships among the eight taxonomic varieties of C. caribaea. Sampling included nuclear ribosomal internal transcribed spacer sequences from 489 Robinieae accessions representing all varieties of C. caribaea and 38 of the 40 species of Coursetia, in addition to chloroplast trnD-trnT sequences from 186 accessions. Separate and combined phylogenetic analyses resolved a clade of conspecific accessions of the Bolivian C. caribaea var. astragalina as sister to the central Andean Coursetia grandiflora clade. Also distantly related to Coursetia caribaea var. caribaea accessions were those of the coastal Oaxacan C. caribaea var. pacifica, which formed the sister clade to accessions of the central Andean C. caribaea var. ochroleuca. The estimated mean ages of the stem clades for these three lineages, 11, 7.7, and 7.7 Ma, respectively, contrasted to the estimated mean ages of the corresponding crown clades of 0, 0, and 1.5 Ma. The contrasting stem and crown ages suggest that these taxa, appropriately ranked as species, Coursetia astragalina, Coursetia diversifolia, and Coursetia ochroleuca, each have persisted over evolutionary time frames as distinct geographically localized populations in seasonally dry tropical forests and woodlands.

Original languageEnglish (US)
Pages (from-to)664-675
Number of pages12
JournalSystematic Botany
Volume43
Issue number3
DOIs
StatePublished - Aug 1 2018

Keywords

  • Neotropics
  • Papilionoideae
  • phylogenetics
  • seasonally dry forests
  • taxonomy

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

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    Lavin, M., Pennington, R. T., Hughes, C. E., Lewis, G. P., Delgado-Salinas, A., Stefano, R. D. D., Queiroz, L. P. D., Cardoso, D., & Wojciechowski, M. (2018). DNA Sequence Variation among Conspecific Accessions of the Legume Coursetia caribaea Reveals Geographically Localized Clades Here Ranked as Species. Systematic Botany, 43(3), 664-675. https://doi.org/10.1600/036364418X697382