Plastid phylogenomics resolves ambiguous relationships within the orchid family and provides a solid timeframe for biogeography and macroevolution
Artículo de revista
2021
Nature Publishing Group
Recent phylogenomic analyses based on the maternally inherited plastid organelle have enlightened
evolutionary relationships between the subfamilies of Orchidaceae and most of the tribes. However,
uncertainty remains within several subtribes and genera for which phylogenetic relationships have
not ever been tested in a phylogenomic context. To address these knowledge-gaps, we here provide
the most extensively sampled analysis of the orchid family to date, based on 78 plastid coding genes
representing 264 species, 117 genera, 18 tribes and 28 subtribes. Divergence times are also provided
as inferred from strict and relaxed molecular clocks and birth–death tree models. Our taxon sampling
includes 51 newly sequenced plastid genomes produced by a genome skimming approach. We focus
our sampling eforts on previously unplaced clades within tribes Cymbidieae and Epidendreae. Our
results confrmed phylogenetic relationships in Orchidaceae as recovered in previous studies, most
of which were recovered with maximum support (209 of the 262 tree branches). We provide for the
frst time a clear phylogenetic placement for Codonorchideae within subfamily Orchidoideae, and
Podochilieae and Collabieae within subfamily Epidendroideae. We also identify relationships that have
been persistently problematic across multiple studies, regardless of the diferent details of sampling
and genomic datasets used for phylogenetic reconstructions. Our study provides an expanded, robust
temporal phylogenomic framework of the Orchidaceae that paves the way for biogeographical and
macroevolutionary studies.
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Plastid phylogenomics resolves ambiguous relationships within the orchid family and provides a solid timeframe for biogeography and macroevolution.pdf
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Título: Plastid phylogenomics resolves ambiguous relationships within the orchid family and provides a solid timeframe for biogeography and macroevolution.pdf
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