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The quest to resolve recent radiations: Plastid phylogenomics of extinct and endangered Hawaiian endemic mints (Lamiaceae)

Welch, A.J.; Collins, K.; Ratan, A.; Drautz-Moses, D.I.; Schuster, S.C.; Lindqvist, C.

The quest to resolve recent radiations: Plastid phylogenomics of extinct and endangered Hawaiian endemic mints (Lamiaceae) Thumbnail


Authors

K. Collins

A. Ratan

D.I. Drautz-Moses

S.C. Schuster

C. Lindqvist



Abstract

The Hawaiian mints (Lamiaceae), one of the largest endemic plant lineages in the archipelago, provide an excellent system to study rapid diversification of a lineage with a remote, likely paleohybrid origin. Since their divergence from New World mints 4–5 million years ago the members of this lineage have diversified greatly and represent a remarkable array of vegetative and reproductive phenotypes. Today many members of this group are endangered or already extinct, and molecular phylogenetic work relies largely on herbarium samples collected during the last century. So far a gene-by-gene approach has been utilized, but the recent radiation of the Hawaiian mints has resulted in minimal sequence divergence and hence poor phylogenetic resolution. In our quest to trace the reticulate evolutionary history of the lineage, a resolved maternal phylogeny is necessary. We applied a high-throughput approach to sequence 12 complete or nearly complete plastid genomes from multiple Hawaiian mint species and relatives, including extinct and rare taxa. We also targeted 108 hypervariable regions from throughout the chloroplast genomes in nearly all of the remaining Hawaiian species, and relatives, using a next-generation amplicon sequencing approach. This procedure generated ∼20 Kb of sequence data for each taxon and considerably increased the total number of variable sites over previous analyses. Our results demonstrate the potential of high-throughput sequencing of historic material for evolutionary studies in rapidly evolving lineages. Our study, however, also highlights the challenges of resolving relationships within recent radiations even at the genomic level.

Citation

Welch, A., Collins, K., Ratan, A., Drautz-Moses, D., Schuster, S., & Lindqvist, C. (2016). The quest to resolve recent radiations: Plastid phylogenomics of extinct and endangered Hawaiian endemic mints (Lamiaceae). Molecular Phylogenetics and Evolution, 99, 16-33. https://doi.org/10.1016/j.ympev.2016.02.024

Journal Article Type Article
Acceptance Date Feb 28, 2016
Online Publication Date Mar 5, 2016
Publication Date Jun 1, 2016
Deposit Date Mar 7, 2016
Publicly Available Date Mar 29, 2024
Journal Molecular Phylogenetics and Evolution
Print ISSN 1055-7903
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 99
Pages 16-33
DOI https://doi.org/10.1016/j.ympev.2016.02.024

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