10.5061/DRYAD.2547D7WMD
Baena-Diaz, Fernanda
0000-0002-0660-0627
Swiss Federal Institute of Technology in Zurich
Widmer, Alex
0000-0001-8253-5137
Swiss Federal Institute of Technology in Zurich
Zemp, Niklaus
0000-0002-0991-5130
Swiss Federal Institute of Technology in Zurich
Insights into the genetic architecture of sexual dimorphism from an
interspecific cross between two diverging Silene (Caryophyllaceae) species
Dryad
dataset
2019
Silene
QTL
Sex chromosomes
2019-10-22T00:00:00Z
2019-10-22T00:00:00Z
en
https://doi.org/10.1111/mec.15271
85380 bytes
3
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
The evolution of sexual dimorphism in species with separate sexes is
influenced by the resolution of sexual conflicts creating sex differences
through genetic linkage or sex-biased expression. Plants with different
degrees of sexual dimorphism are thus ideal to study the genetic basis of
sexual dimorphism. In this study we explore the genetic architecture of
sexual dimorphism between Silene latifolia and S. dioica. These species
have chromosomal sex determination and differ in the extent of sexual
dimorphism. To test whether QTL for sexually dimorphic traits have
accumulated on the sex chromosomes and to quantify their contribution to
species differences, we create a linkage map and performed QTL analysis of
life history, flower and vegetative traits using an unidirectional
interspecific F2 hybrid cross. We found support for an accumulation of QTL
on the sex chromosomes and that sex differences explained a large
proportion of the variance between species, suggesting that both natural
and sexual selection contributed to species divergence. Sexually dimorphic
traits that also differed between species displayed transgressive
segregation. We observed a reversal in sexual dimorphism in the F2
population, where males tended to be larger than females, indicating that
sexual dimorphism is constrained within populations but not in recombinant
hybrids. This study contributes to the understanding of the genetic basis
of sexual dimorphism and its evolution in Silene.
Phenotypic data of F2 Silene individuals