Data from: Understanding the spectacular failure of DNA barcoding in willows (Salix): Does this result from a trans-specific selective sweep?

We recovered 39 unique haplotypes, from more than 500 specimens, that could be partitioned into six major haplotype groups. A unique variant of group I (haplotype 1*) was shared by 53 species in three of five Salix subgenera. This unusual pattern of haplotype sharing across infrageneric taxa is suggestive of either a massive non-random coalescence failure (incomplete lineage sorting), or of repeated plastid capture events, possibly including a historical selective sweep of haplotype 1* across taxonomic sections.

The former is unlikely as molecular dating indicates that haplotype 1* originated recently, and is nested in the oldest major haplotype group in the genus. Further, we detected significant non-neutrality in the frequency spectrum of mutations in group I, but not outside group I, and demonstrated a striking absence of geographic structure to the haplotype distributions in this group. The most likely explanation for the patterns we observed involves recent repeated plastid capture events, aided by widespread hybridization and long-range seed dispersal, but primarily propelled by one or more trans-species selective sweeps.

Usage notes bold salix samples species, specimen, location lists SALIX_matK matK sequence alignment SALIX_rbcL rbcL sequence alignment SALIX_rpoB rpoB sequence alignment SALIX_rpoC1 rpoC1 sequence alignment SALIX_trnH trnH-psbA sequence alignment SALIX_psbK psbK-psbI sequence alignment SALIX_atpF atpF-atpH sequence alignment SALIX_COI COI sequence alignment