Data from: Nitrate reductase phylogeny of potato (Solanum sect. Petota) genomes with emphasis on the origins of the polyploid species

Solanum section Petota is taxonomically difficult, partly because of
interspecific hybridization at both the diploid and polyploid levels.
There is much disagreement regarding species boundaries and affiliation of
species to series. Elucidating the phylogenetic relationships within the
polyploids is crucial for an effective taxonomic treatment of the section
and for the utilization of wild potato germplasm in breeding programs. We
here infer relationships among the potato diploids and polyploids using
nitrate reductase (NIA) sequence data in comparison to prior plastid
phylogenies and: 1) examine genome types within section Petota, 2) show
species in the polyploid series Conicibaccata, Longipedicellata, and in
the Iopetalum group to be derived from allopolyploidization, 3) support an
earlier hypothesis by confirming S. verrucosum as the maternal genome
donor for the polyploid species S. demissum as well as species in the
Iopetalum Group, 4) demonstrate that S. verrucosum is the closest relative
to the maternal genome donor for species in ser. Longipedicellata, 5)
support the close relationship between S. acaule and diploid species from
series Megistacroloba and Tuberosa, and 6) show the North and Central
American B genome species to be well distinguished from the A genome
species of South America.