Data from: The genetic basis of speciation in the Giliopsis lineage of Ipomopsis (Polemoniaceae)

We detected 1-6 QTLs per trait, with each QTL generally explaining small to modest amounts of the phenotypic variance of a backcross hybrid population. In contrast, flowering time and anthocyanin abundance (a metric of colour variation) were controlled by a few QTLs of relatively large effect. QTLs were strongly clustered within linkage groups, with 26 of 37 QTLs localized to six marker-interval "hotspots," all of which harbored pleiotropic QTLs.

In contrast to other studies that have examined the genetic basis of pollinator shifts, our results indicate that, in general, mutations of small to modest effect on phenotype were involved. Thus, the evolutionary transition between the distinct pollination modes of I. guttata and I. tenuifolia likely proceeded incrementally, rather than saltationally.

Usage notes

Data for QTL analysis of Ipomopsis genotypes and phenotypes of parents and hybrids ipomopsisQTLCARTfiles.xls