Skip to main content
Dryad logo

Data for: The genetic basis of floral mechanical isolation between two hummingbird-pollinated Neotropical understory herbs

Citation

Kay, Kathleen; Surget-Groba, Yann (2021), Data for: The genetic basis of floral mechanical isolation between two hummingbird-pollinated Neotropical understory herbs, Dryad, Dataset, https://doi.org/10.5061/dryad.7sqv9s4r7

Abstract

Floral divergence can contribute to reproductive isolation among plant lineages, and thus provides an opportunity to study the genetics of speciation, including the number, effect size, mode of action, and interactions of quantitative trait loci (QTL). Moreover, flowers represent suites of functionally interrelated traits, but it is unclear to what extent the phenotypic integration of the flower is underlain by a shared genetic architecture, which could facilitate or constrain correlated evolution of floral traits. Here, we examine the genetic architecture of floral morphological traits involved in an evolutionary switch from bill to forehead pollen placement between two species of hummingbird-pollinated Neotropical understory herbs that are reproductively isolated by these floral differences. For the majority of traits, we find multiple QTL of relatively small effect spread throughout the genome. We also find substantial colocalization and alignment of effects of QTL underlying different floral traits that function together to promote outcrossing and reduce heterospecific pollen transfer. Our results are consistent with adaptive pleiotropy or linkage of many coadapted genes, either of which could have facilitated a response to correlated selection and helped to stabilize divergent phenotypes in the face of low levels of hybridization. Moreover, our results indicate that floral mechanical isolation can be consistent with an infinitesimal model of adaptation.

Usage Notes

A description of each file can be found in the File_manifest.txt file. There is also an associated ReadMe file with each zipped folder of code.

Funding

National Science Foundation, Award: DEB -0947138

National Science Foundation, Award: DEB-1737889