Abstract:
:Species of Podophylloideae (Berberidaceae, Ranunculales) are of great pharmacogenetic importance and represent the classic biogeographic disjunction between eastern Asia (EA; 10 ssp.) and eastern North America (ENA; 2 ssp.). However, previous molecular studies of this group suffered from low phylogenetic resolution and/or insufficient marker variability. This study is the first to report whole-plastome sequence data for all 12 species of Podophylloideae (14 individuals) and a close relative, Achlys triphylla. These 15 plastomes proved highly similar in overall size (156,240-157,370 bp), structure, gene order and content, also when compared to other Ranunculales, but also revealed some structural variations caused by the expansion or contraction of the inverted repeats (IRs) into or out of adjacent single-copy regions. Our phylogenomic analysis, based on 63 plastome-derived protein-coding genes (CDS), supported the monophyly of Podophylloideae and its two major genera (EA: Dysosma, EA/ENA: Diphylleia), with Podophyllum peltatum L. (ENA) being more closely related to Diphylleia than to the group's earliest diverging species, Sinopodophyllum hexandrum (EA). Furthermore, within this subfamily/dataset, matK was identified as the fastest evolving gene, which proved to be under positive selection especially in more recently derived, lower-elevation lineages of Dysosma, possibly reflecting an adaptive response to novel environmental (i.e. subtropical compared to higher-elevation/alpine) conditions. Finally, several highly variable noncoding regions were identified in the plastomes of Podophylloideae and Ranunculales. These highly variable loci should be the best choices for future phylogenetic, phylogeographic, and population-level genetic studies. Overall, our results demonstrate the power of plastid phylogenomics to improve phylogenetic resolution, and contribute to a better understanding of plastid gene evolution in Podophylloideae.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Ye WQ,Yap ZY,Li P,Comes HP,Qiu YXdoi
10.1016/j.ympev.2018.07.001subject
Has Abstractpub_date
2018-10-01 00:00:00pages
978-987eissn
1055-7903issn
1095-9513pii
S1055-7903(17)30942-9journal_volume
127pub_type
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