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Resolving basal lamiid phylogeny and the circumscription of icacinaceae with a plastome-scale data set
GREGORY W. STULL
RODRIGO STEFANO DUNO
DOUGLAS E. SOLTIS
PAMELA S. SOLTIS
Acceso Abierto
Atribución-NoComercial-SinDerivadas
DOI: 10.3732/ajb.1500298
GARRYALESICACINACEAE
LAMIIDAE
METTENIUSACEAE
ONCOTHECACEAE
PHYLOGENETIC NOMENCLATURE
PHYLOGENOMICS
PLASTID GENOME
REMISE OF THE STUDY: Major relationships within Lamiidae, an asterid clade with ~40 000 species, have largely eluded resolution despite two decades of intensive study. The phylogenetic positions of Icacinaceae and other early-diverging lamiid clades (Garryales, Metteniusaceae, and Oncothecaceae) have been particularly problematic, hindering classification and impeding our understanding of early lamiid (and euasterid) character evolution. METHODS: To resolve basal lamiid phylogeny, we sequenced 50 plastid genomes using the Illumina sequencing platform and combined these with available asterid plastome sequence data for more comprehensive phylogenetic analyses. KEY RESULTS: Our analyses resolved basal lamiid relationships with strong support, including the circumscription and phylogenetic position of the enigmatic Icacinaceae. This greatly improved basal lamiid phylogeny offers insight into character evolution and facilitates an updated classification for this clade, which we present here, including phylogenetic definitions for 10 new or converted clade names. We also offer recommendations for applying this classification to the Angiosperm Phylogeny Group (APG) system, including the recognition of a reduced Icacinaceae, an expanded Metteniusaceae, and two orders new to APG: Icacinales (Icacinaceae + Oncothecaceae) and Metteniusales (Metteniusaceae). CONCLUSIONS: The lamiids possibly radiated from an ancestry of tropical trees with inconspicuous flowers and large, drupaceous fruits, given that these morphological characters are distributed across a grade of lineages (Icacinaceae, Oncothecaceae, Metteniusaceae) subtending the core lamiid clade (Boraginales, Gentianales, Lamiales, Solanales, Vahlia). Furthermore, the presence of similar morphological features among members of Aquifoliales suggests these characters might be ancestral for the Gentianidae (euasterids) as a whole.
2015
Artículo
American journal of botany, 102(11), 1794-1813, 2015.
Inglés
Stull, G. W., Duno de Stefano, R., Soltis, D. E., & Soltis, P. S. (2015). Resolving basal lamiid phylogeny and the circumscription of Icacinaceae with a plastome‐scale data set. American journal of botany, 102(11), 1794-1813.
BIOLOGÍA Y QUÍMICA
Versión publicada
publishedVersion - Versión publicada
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