Phylogenetic relationships in Bulbostylis (Abildgaardieae: Cyperaceae) inferred from nuclear and plastid DNA sequence data
Fecha
2018Autor
Reutemann Arnolfo, Andrea Guadalupe
Ardissone, Rodrigo E.
López, María Gabriela
Muchut, Sebastián Elías
Boldrini, Ilsi
Vegetti, Abelardo Carlos
Giussani, Liliana Mónica
Metadatos
Mostrar el registro completo del ítemResumen
Previous molecular phylogenetic analyses of the family Cyperaceae based on rbcL sequences showed Bulbostylis as
paraphyletic, with B. atrosanguinea and B. hispidula forming a clade with Nemum spadiceum. On the contrary, phylogenetic
analyses of the tribe Abildgaardieae based on nuclear (ITS ribosomal region) and plastid sequences (trnL-F region) showed
Bulbostylis as monophyletic, although they only incorporated four species of Bulbostylis and none of Nemum. In this work, we
presented a phylogenetic hypothesis of Bulbostylis based on a comprehensive sampling, including species from different
continents for the first time. New sequences of Abildgaardia, Crosslandia, Fimbristylis, and Nemum were included to test the
monophyly of Bulbostylis. In total, 84 sequences of both ITS and trnL regions were generated. Analyses were performed
using Bayesian inference, maximum likelihood, and parsimony. Ancestral state reconstruction was performed using ML,
MCMC, and parsimony methods. In all analyses, Bulbostylis resulted paraphyletic as Nemum atracuminatum is nested within
it. Most American species of Bulbostylis grouped together, but relationships amongst them appeared poorly resolved.
Ancestral state reconstructions of native distribution suggest an African ancestor of Bulbostylis, with at least three introduction
independent events of the species in America. Morphological diagnostic characters such as the ‘style base permanence or
detachment from the ripe achene’, and the ‘micromorphological patterns of the achene surface’ are homoplastic in this
phylogenetic context, and therefore unsuitable to propose infrageneric groupings within the Bulbostylis.
Colecciones
- Artículos de revista [476]