10.5061/DRYAD.B32S5
Wood, Troy E.
United States Geological Survey
Nakazato, Takuya
University of Memphis
Rieseberg, Loren H.
University of British Columbia
Data from: The genetic basis of speciation in the Giliopsis lineage of
Ipomopsis (Polemoniaceae)
Dryad
dataset
2013
floral
Ipomopsis tenuifolia
QTL
Ipomopsis guttata
pollinator
Holocene
2013-04-03T14:10:54Z
2013-04-03T14:10:54Z
en
https://doi.org/10.1038/hdy.2013.41
157610 bytes
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CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
One of the most powerful drivers of speciation in plants is
pollinator-mediated disruptive selection, which leads to the divergence of
floral traits adapted to the morphology and behavior of different
pollinators. Despite the widespread importance of this speciation
mechanism, its genetic basis has been explored in only a few groups. Here,
we characterize the genetic basis of pollinator-mediated divergence of two
species in genus Ipomopsis, I. guttata and I. tenuifolia, using
quantitative trait locus (QTL) analyses of floral traits and other
variable phenotypes. 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.
Data for QTL analysis of Ipomopsisgenotypes and phenotypes of parents and
hybridsipomopsisQTLCARTfiles.xls
Baja California