| Abstract Detail
Hybrids and Hybridization Uckele, Kathryn [1], Richards, Lora [2], Shelef, Oren [2], Parchman, Thomas [2]. Landscape genomic variation across three juniper species and their hybrids. Hybrid zones can be used as natural laboratories for investigating the drivers and consequences of admixture and reproductive isolation between ecologically distinct plant species. Because adaptation to environmental variation across the hybrid landscape may contribute substantially to variation in admixture, analyses which quantify genetic variation associated with environmental factors may improve our understanding of how genetic variation is structured across ecological and spatial gradients in hybridizing plant taxa. Juniper (Juniperus) is a foundational tree genus which occurs in many arid regions of western North America. Juniperus osteosperma (Utah juniper), J. occidentalis (western juniper), and J. grandis (Sierra juniper) come into secondary contact and hybridize in northwestern Nevada, where past work using cpDNA and nuclear ribosomal DNA has suggested a west-east gradient of introgression. We generated a data set of 8,882 SNPs spanning 25 populations using a reduced-representation sequencing approach (ddRAD) to generate a finer-scale understanding of population genetic structure and to infer ancestry across pure and potential hybrid populations spanning Oregon, California, Nevada, and Utah. Utilizing two methods of environmental association analysis, we evaluate the extent to which environmental variation may shape genetic variation and hybrid ancestry across geographic space. In addition to resolving spatial genetic structure among hybrid and parental populations, our results reveal complex patterns of hybrid ancestry derived from admixture of three lineages. Furthermore, after accounting for spatial genetic structure, environmental variation explains a significant amount of the genetic variation differentiating parental from admixed populations.
Log in to add this item to your schedule
1 - University of Nevada Reno, Biology, 1664 N. Virginia Street, Reno, NV, 89503, USA
2 - University of Nevada Reno, 1664 N. Virginia Street, Reno, NV, 89503, United States
Keywords:
Hybridization
population genetics
landscape genetics.
Presentation Type: Oral Paper
Session: 10, Hybrids and Hybridization
Location: 101/Mayo Civic Center
Date: Monday, July 23rd, 2018
Time: 2:30 PM
Number: 10005
Abstract ID:305
Candidate for Awards:Margaret Menzel Award |
