| Summary: | A robust phylogeny is prerequisite to understand the evolution and biogeography of organisms. However, ancient and recent evolutionary radiations occurred in many plant lineages, which pose great challenges for phylogenetic analysis, especially for conifers characterized by large effective population sizes and long generation times. Picea is an important component of the dark coniferous forests in the Northern Hemisphere. Previous studies improved our understanding of its evolutionary history, but its interspecific relationships and biogeographic history remain largely unresolved. In the present study, we reconstructed a well-resolved phylogeny of Picea by comparative transcriptomic analysis based on a complete species sampling. The phylogenetic analysis, together with molecular dating and ancestral area reconstruction, further supports the North American origin hypothesis for Picea, and indicates that this genus experienced multiple out-of-North America dispersals by the Bering Land Bridge. We also found that spruces in the Japanese Archipelago have multiple origins, and P. morrisonicola from the Taiwan Island has a close relationship with species from the Qinghai-Tibetan Plateau and adjacent regions. Our study provides the first complete phylogeny of Picea at the genomic level, which is important for future studies of this genus. 1141_AA_datasets AA_Trees AA_Tree.zip AA_concatenation.fas 1141OG-AA-dataset-FcC_supermatrix.fas 1141_CDS_datasets CDS_tree CDS_Tree.zip CDS_concatenation_data.fas 1141OG-CDSdataset-FcC_supermatrix.fas 1141_CDS12_datasets CDS12_tree CDS12_Tree.zip CDS12_concatenation.fas 1141OG-CDS12dataset-FcC_supermatrix.fas Molecular Clock result 1141-CDS12-30YI-CIPRES-beast-treeannotator.tre
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